1992 Vol. 5, No. 4
Display Method:
1992, 5(4): 371-378.
[Abstract]
[PDF 579KB]
Abstract:
In order to find out the responses of fertilization on the bamboo plantations and the rational rates of N, P, K fertilizer applied, three experiments of fertilization were conducted in Anji County of Zhejiang Province, Shaxian County and Changtin County of Fujiang Province. Trials lasted for 6 years. Final results showed that the responses of fertilization on rational density of bamboo stands (about 3 000 standing plants per ha) were more significant than that of sparse bamboo stands (1500 standing plants per ha). Fertilizing treatments in rational density stands yielded 2.67~5.70t/ha of fresh culms and 0.34~0.75 t/ha.a of fresh bamboo shoots more than that of the check from 1985~1990. Each kg of available N, P,K produced 27.8~62.5kg of fresh culms and 2.75~9.15 kg of fresh shoots. The optimum rate of application on dense bamboo stand for producing both timber and shoot was N310, P83, K118kg per ha.For the sparse bamboo stands,yearly increment of bamboo culms reduced 50%, compared with the dense stands in equal level of N application. The optimum rate of application was N138, P37, K79 kg per ha. This paper also discussed the response of organic manure, the effects of fertilization on the properties of bamboo timber as well as the long-term effect of fertilization.
In order to find out the responses of fertilization on the bamboo plantations and the rational rates of N, P, K fertilizer applied, three experiments of fertilization were conducted in Anji County of Zhejiang Province, Shaxian County and Changtin County of Fujiang Province. Trials lasted for 6 years. Final results showed that the responses of fertilization on rational density of bamboo stands (about 3 000 standing plants per ha) were more significant than that of sparse bamboo stands (1500 standing plants per ha). Fertilizing treatments in rational density stands yielded 2.67~5.70t/ha of fresh culms and 0.34~0.75 t/ha.a of fresh bamboo shoots more than that of the check from 1985~1990. Each kg of available N, P,K produced 27.8~62.5kg of fresh culms and 2.75~9.15 kg of fresh shoots. The optimum rate of application on dense bamboo stand for producing both timber and shoot was N310, P83, K118kg per ha.For the sparse bamboo stands,yearly increment of bamboo culms reduced 50%, compared with the dense stands in equal level of N application. The optimum rate of application was N138, P37, K79 kg per ha. This paper also discussed the response of organic manure, the effects of fertilization on the properties of bamboo timber as well as the long-term effect of fertilization.
1992, 5(4): 379-386.
Abstract:
The high-yield clones, No. 7(79-5), 3(Fu 17) and 6(80-24) as well as the fairy high-yield and dwarfish clones, No. 1(79-13) and 6(Fu 19), have been selected by means of the standard identifying experiments and productive investigations on eight clones of Oil-Camellia for ten years in Jinxian County, Jiangxi Province. It is more suitable that the clones, No.7, 3, and 2, were used as major cultivated strains and the clones,No. 1 and 6 as associated cultivated strains, after examining and evaluating synthetically every index about them. The model of the combination disp-osed, which was recommended for production, was No, 7-3-2-7-1-6, which each clone was planted into one row in order of them and in turn of the model. The oil yields of the model per ha and per year from 4-yr-old to 8-yr-old plantation can reach 169.7, 210.0, 290.3, 352.5, and 384.0kg respectively under common management, if bud-understock graftings are adopted to afforest and the spacings of 1.5m×2.0m,3330 plants per ha, are kept.
The high-yield clones, No. 7(79-5), 3(Fu 17) and 6(80-24) as well as the fairy high-yield and dwarfish clones, No. 1(79-13) and 6(Fu 19), have been selected by means of the standard identifying experiments and productive investigations on eight clones of Oil-Camellia for ten years in Jinxian County, Jiangxi Province. It is more suitable that the clones, No.7, 3, and 2, were used as major cultivated strains and the clones,No. 1 and 6 as associated cultivated strains, after examining and evaluating synthetically every index about them. The model of the combination disp-osed, which was recommended for production, was No, 7-3-2-7-1-6, which each clone was planted into one row in order of them and in turn of the model. The oil yields of the model per ha and per year from 4-yr-old to 8-yr-old plantation can reach 169.7, 210.0, 290.3, 352.5, and 384.0kg respectively under common management, if bud-understock graftings are adopted to afforest and the spacings of 1.5m×2.0m,3330 plants per ha, are kept.
1992, 5(4): 387-393.
Abstract:
This paper deals with the choice of nutrient solutions for the solution culture of the seedlings of Calamus tetradactylus, the best ratio of N P K in nutrient solution for the growth of the seedlings, the symptoms of nutrition deficiency and the effects of nutrition deficiency on the growth of the seedling. The results showed that 1/2 Machlis nutrient solution at pH 5.0 was quite suitable for the solution culture of the seedling; the ratio of 90×10-6(ppm) N:40×10-6(ppm)P:160×10-6(ppm)K was the best;the symptoms of nutrition deficiency appeared on the seedling very slowly, but after 6 months of solution culture some symptoms could be seen. During the solution culture, nutrition deficiency affected the growth of the above-ground more seriously than that of under-ground,therefore the rate of fresh weight of the above-ground to under-ground decreased.
This paper deals with the choice of nutrient solutions for the solution culture of the seedlings of Calamus tetradactylus, the best ratio of N P K in nutrient solution for the growth of the seedlings, the symptoms of nutrition deficiency and the effects of nutrition deficiency on the growth of the seedling. The results showed that 1/2 Machlis nutrient solution at pH 5.0 was quite suitable for the solution culture of the seedling; the ratio of 90×10-6(ppm) N:40×10-6(ppm)P:160×10-6(ppm)K was the best;the symptoms of nutrition deficiency appeared on the seedling very slowly, but after 6 months of solution culture some symptoms could be seen. During the solution culture, nutrition deficiency affected the growth of the above-ground more seriously than that of under-ground,therefore the rate of fresh weight of the above-ground to under-ground decreased.
1992, 5(4): 394-401.
Abstract:
The horned gall, one of the Chinese gallnuts, caused by Schlechtendalia chinensis is an important raw chemical material. But the yield of the gall is only 15~25 kg/ha in natural conditions. According to the results of the studies on the aphid’s biology, the main reasons why the yield is poor are as follows: the migration rate either in spring or in summer is very low; the mortality in overwintering period is very high; the sexuparae and the females produce a few offspring. So rate of increase of the aphid’s population is very low. On the basis of the above a great mass of sexuparae adults must be raised and reached the first host on which the gall is formed to get more galls by mass-cultivating the second hosts (mossess), mass-inoculating the aphids on the second hosts, selecting and creating a favorable environment for the growth and migration of sexuparae.
The horned gall, one of the Chinese gallnuts, caused by Schlechtendalia chinensis is an important raw chemical material. But the yield of the gall is only 15~25 kg/ha in natural conditions. According to the results of the studies on the aphid’s biology, the main reasons why the yield is poor are as follows: the migration rate either in spring or in summer is very low; the mortality in overwintering period is very high; the sexuparae and the females produce a few offspring. So rate of increase of the aphid’s population is very low. On the basis of the above a great mass of sexuparae adults must be raised and reached the first host on which the gall is formed to get more galls by mass-cultivating the second hosts (mossess), mass-inoculating the aphids on the second hosts, selecting and creating a favorable environment for the growth and migration of sexuparae.
1992, 5(4): 402-408.
Abstract:
Based on the provenance trial of 51 seed sources at seedling stage and 21 provenances on young stands at the age of seven and with the adaptability being the main object, observations were made on the seed character, seedling growth rhythm, and drought resistance of the young stand, variation regularity of growth, etc. The result shows that it can be seen that the tree height of the south provenance is higher than that of the north provenance, with the Nishan provenance being the highest, which is 2.4 times higher than the lowest. Among the population variation of Platycladus orientalis, typical increment increases with the increase of temperature and precipitation. There appears a trend that the southeast provenance is better than the northwest,, while the stabilities and adaptation of the northwest provenance is better than those of the southeast. Therefore, the provenances were classified into seven zones.
Based on the provenance trial of 51 seed sources at seedling stage and 21 provenances on young stands at the age of seven and with the adaptability being the main object, observations were made on the seed character, seedling growth rhythm, and drought resistance of the young stand, variation regularity of growth, etc. The result shows that it can be seen that the tree height of the south provenance is higher than that of the north provenance, with the Nishan provenance being the highest, which is 2.4 times higher than the lowest. Among the population variation of Platycladus orientalis, typical increment increases with the increase of temperature and precipitation. There appears a trend that the southeast provenance is better than the northwest,, while the stabilities and adaptation of the northwest provenance is better than those of the southeast. Therefore, the provenances were classified into seven zones.
1992, 5(4): 409-416.
Abstract:
Provenance trials of Eucalyptus globulus Labill. were conducted in Jindian Forest Farm, Yunnan Province. 3 subspecies: Eucalyptus globulus Labill. ssp. globulus Kirkp., E. globulus Labiil. ssp. bicostata Kirkp. and E. globulus Labill. ssp. maidenii Kirkp. were included. The 4 years results showed that there were no statistically significant differences between the 3 subspecies in growth rates, but there were significant differences between provenances of each subspecies in growth rates and adaptability to the environment. Among the subspecies, globulus was the highest in growth rates, followed by bicostata and maidenii. Leperena provenance was the highest in growth rates of globulus, while 12132 and 9539 were the highest of maidenii and bicostata respectively. No significant differences were found between the best provenances of all the subspecies and the controls.
Provenance trials of Eucalyptus globulus Labill. were conducted in Jindian Forest Farm, Yunnan Province. 3 subspecies: Eucalyptus globulus Labill. ssp. globulus Kirkp., E. globulus Labiil. ssp. bicostata Kirkp. and E. globulus Labill. ssp. maidenii Kirkp. were included. The 4 years results showed that there were no statistically significant differences between the 3 subspecies in growth rates, but there were significant differences between provenances of each subspecies in growth rates and adaptability to the environment. Among the subspecies, globulus was the highest in growth rates, followed by bicostata and maidenii. Leperena provenance was the highest in growth rates of globulus, while 12132 and 9539 were the highest of maidenii and bicostata respectively. No significant differences were found between the best provenances of all the subspecies and the controls.
1992, 5(4): 417-422.
Abstract:
Based on the data collected during the period of 1988~1990 in the stands of Pinns massoniana located in Qianshan County of Anhui Province, the compositions of the spider community were studied and the spider community of different stands were classified into groups in terms of Czekanowsiki-Sorensen's index of similiarity. The results indicate that the family of Araneidae is the most abundant in both species and individuals. There are 9 dominant species, of which Mecynogea sp. and Theridion pinastri are the most dominant ones and T. pinastri could adapt to a wider environments. Mixed stand and elevation of the stands have significant effects on the compositions of the spider community. From the hilly lands to mountainous areas, the similarity of spider community tends to decrease and the species tends to be more abundant.
Based on the data collected during the period of 1988~1990 in the stands of Pinns massoniana located in Qianshan County of Anhui Province, the compositions of the spider community were studied and the spider community of different stands were classified into groups in terms of Czekanowsiki-Sorensen's index of similiarity. The results indicate that the family of Araneidae is the most abundant in both species and individuals. There are 9 dominant species, of which Mecynogea sp. and Theridion pinastri are the most dominant ones and T. pinastri could adapt to a wider environments. Mixed stand and elevation of the stands have significant effects on the compositions of the spider community. From the hilly lands to mountainous areas, the similarity of spider community tends to decrease and the species tends to be more abundant.
1992, 5(4): 423-428.
Abstract:
In 1981~1990, the resistance trials both in the field and lab. in North China demonstrate that poplar cultivars, Zhonglin-115, Zhonglin-319, Zhoiiglin-34 are new ones, which are resistant to poplar trunk cancer, Dothiorella gregaria, and leaf black spot, Marssonina brunnea. They are more resistant than P. bcijingensis and I-214. Their incidence rate of trunk cancer is 80%~100% lower than that of P. 'popularis', and that of black spot is 80% lower than that of P.×canadensis, I-214, Pl5A. They are also rather resistant to other diseases and insect pests, such as, the longhorn beetle etc. They are also fine improved cultivars of fast-growing, high quality, easy propagation, high survival rate and adaptability and they have been extending on a large scale.
In 1981~1990, the resistance trials both in the field and lab. in North China demonstrate that poplar cultivars, Zhonglin-115, Zhonglin-319, Zhoiiglin-34 are new ones, which are resistant to poplar trunk cancer, Dothiorella gregaria, and leaf black spot, Marssonina brunnea. They are more resistant than P. bcijingensis and I-214. Their incidence rate of trunk cancer is 80%~100% lower than that of P. 'popularis', and that of black spot is 80% lower than that of P.×canadensis, I-214, Pl5A. They are also rather resistant to other diseases and insect pests, such as, the longhorn beetle etc. They are also fine improved cultivars of fast-growing, high quality, easy propagation, high survival rate and adaptability and they have been extending on a large scale.
1992, 5(4): 429-435.
Abstract:
Eriococcus rugosus Wang, an important new insect species damaged bamboos in the recent years, are distributed in Anhui, Jiangsu, Shandong, Shanghai and Zhejiang. E. rugosus has one generation per year in Fuyang County of Zhejiang Province, overwintering as the second instar nymph and male prepupa. Adult males appear in late March. Most of the third instar nymphs turn into adult female in early April and deposite eggs in early May. The first instar nymphs infected the bamboo shoot bud, appear in early May. The second instar ones oversummer in late October. The cocoon males appear in early November, then overwinter. There is a maximum population density in 2-year-old bamboo groves, medium in 4-year-old ones, minimum in 6-year-old or over 6-year-old ones. The percentage of groves damaged by the pest is up to 100%, 92% and 50%, respectively. The effective control of the pest can be achieved by injecting 50% methamidophos emulsion 2ml to each bamboo from middle March to middle April.
Eriococcus rugosus Wang, an important new insect species damaged bamboos in the recent years, are distributed in Anhui, Jiangsu, Shandong, Shanghai and Zhejiang. E. rugosus has one generation per year in Fuyang County of Zhejiang Province, overwintering as the second instar nymph and male prepupa. Adult males appear in late March. Most of the third instar nymphs turn into adult female in early April and deposite eggs in early May. The first instar nymphs infected the bamboo shoot bud, appear in early May. The second instar ones oversummer in late October. The cocoon males appear in early November, then overwinter. There is a maximum population density in 2-year-old bamboo groves, medium in 4-year-old ones, minimum in 6-year-old or over 6-year-old ones. The percentage of groves damaged by the pest is up to 100%, 92% and 50%, respectively. The effective control of the pest can be achieved by injecting 50% methamidophos emulsion 2ml to each bamboo from middle March to middle April.
1992, 5(4): 436-441.
Abstract:
The persimmon fruit moth, Stathmopoda massinissa Meyrick, has two generations a year in Zunhua County, Hebei Province. The adults of the first generation emerge from late May to mid-June and of the second generation from late July to mid-August. The adults especially male adults can be attracted by black light trap. The eggs are laid mostly in the upper and middle parts of the crown. The larvae of the first and second generations bore into the fruits in early June and early August separately. 20% Meothrin EC or 40% Sumicidin EC at a dilution of 1:3000 were used to contol the pest in adult emergence period and larval boring period. As a result, the rate of bored fruits was decreased by 4~10 times.
The persimmon fruit moth, Stathmopoda massinissa Meyrick, has two generations a year in Zunhua County, Hebei Province. The adults of the first generation emerge from late May to mid-June and of the second generation from late July to mid-August. The adults especially male adults can be attracted by black light trap. The eggs are laid mostly in the upper and middle parts of the crown. The larvae of the first and second generations bore into the fruits in early June and early August separately. 20% Meothrin EC or 40% Sumicidin EC at a dilution of 1:3000 were used to contol the pest in adult emergence period and larval boring period. As a result, the rate of bored fruits was decreased by 4~10 times.
1992, 5(4): 442-446.
Abstract:
This paper discusses the algorism for polygon overlay. The result shows: The problem of complicated topology relation after coverage overlay and difficulty of feature attribute refilling can easily be resolved in the way of merging two map into a new one, regenerating the topology relation of spatial data, regenerating polygons, regenerating label points and refilling feature attribute with label points. The coverage overlay can be implemented successfully.
This paper discusses the algorism for polygon overlay. The result shows: The problem of complicated topology relation after coverage overlay and difficulty of feature attribute refilling can easily be resolved in the way of merging two map into a new one, regenerating the topology relation of spatial data, regenerating polygons, regenerating label points and refilling feature attribute with label points. The coverage overlay can be implemented successfully.
1992, 5(4): 447-453.
Abstract:
From the viewpoint of protection for Guangdong's natural environment and natural resources the present article indicates the significance and importance of establishment of forest and fauna nature reserve in Guangdong Province. It also illustrates the general situation and their trend of development and gives some opinions on management and administration and rational use of forest and fauna nature reserve corresponding to actual situation of Guangdong Province.
From the viewpoint of protection for Guangdong's natural environment and natural resources the present article indicates the significance and importance of establishment of forest and fauna nature reserve in Guangdong Province. It also illustrates the general situation and their trend of development and gives some opinions on management and administration and rational use of forest and fauna nature reserve corresponding to actual situation of Guangdong Province.
1992, 5(4): 454-458.
Abstract:
The dynamic economic analysis was adopted to evalute the economic benefits from the cultivation of the fast-growing and high-yielding Chinese Fir plantation. The results showed that there was a remarkable economic benefit from the cultivation of the plantation. The maximum net benefit investment ratio, inter rate of return (IRR), and net present value might be 3.15, 19.5%, and 5275.35 yuan/ha respectively, and the minimum ones 1.60, 15.2%, and 1 392.75 yuan/ha respectively. The results also indicted that the internal rate of return was still higher than the basic rate of return while the 7 parameters were changed, such as a drop in timber price by 20%, or a rise in cutting cost by 20%. The cultivation of the fast-growing and high-yielding Chinese Fir plantation could endure the risk of a rise in total cost by 58% or a drop in net benefit by 36%.
The dynamic economic analysis was adopted to evalute the economic benefits from the cultivation of the fast-growing and high-yielding Chinese Fir plantation. The results showed that there was a remarkable economic benefit from the cultivation of the plantation. The maximum net benefit investment ratio, inter rate of return (IRR), and net present value might be 3.15, 19.5%, and 5275.35 yuan/ha respectively, and the minimum ones 1.60, 15.2%, and 1 392.75 yuan/ha respectively. The results also indicted that the internal rate of return was still higher than the basic rate of return while the 7 parameters were changed, such as a drop in timber price by 20%, or a rise in cutting cost by 20%. The cultivation of the fast-growing and high-yielding Chinese Fir plantation could endure the risk of a rise in total cost by 58% or a drop in net benefit by 36%.
1992, 5(4): 459-464.
Abstract:
RNase activity in the seedling of Black Locust increased remarkably under water stress. The while, Al, Cd, Co, Cr, Fe, Li, Mn, Na, Ti and V ions contents in water-stressed leaves of Black Locust seedling rose as compared with the control, Ba, Ca, Ni and Sr contents slightly decreased, and there were no changes in K, Cu, Mg, Pb and Zn contents. Pretreatment of the Black Locust seedlings with cycloheximid (30 ppm) for 24 h. before dehydration completely prevented the increase of RNase activity due to water stress. Partly purification of 3H-leucine-labelled RNase from control and water-stressed Black Locust seedlings revealed that incorporation of 3H-leucine into the RNase of water-stressed seedlings was markedly decreased, and activity of RNase from water-stressed seedlings was enhanced by 13% as compared to with the control. It implies that an increase in activity of RNase from water-stressed seedlings was mainly due to its fresh synthesis.
RNase activity in the seedling of Black Locust increased remarkably under water stress. The while, Al, Cd, Co, Cr, Fe, Li, Mn, Na, Ti and V ions contents in water-stressed leaves of Black Locust seedling rose as compared with the control, Ba, Ca, Ni and Sr contents slightly decreased, and there were no changes in K, Cu, Mg, Pb and Zn contents. Pretreatment of the Black Locust seedlings with cycloheximid (30 ppm) for 24 h. before dehydration completely prevented the increase of RNase activity due to water stress. Partly purification of 3H-leucine-labelled RNase from control and water-stressed Black Locust seedlings revealed that incorporation of 3H-leucine into the RNase of water-stressed seedlings was markedly decreased, and activity of RNase from water-stressed seedlings was enhanced by 13% as compared to with the control. It implies that an increase in activity of RNase from water-stressed seedlings was mainly due to its fresh synthesis.
1992, 5(4): 465-468.
Abstract:
Chloroplast DNA (cpDNA) were prepared from five Poplar samples (two hybrids of Populus deltoides Bartr. CL.‘Lux'×P. deltoides Bartr. CL. ‘Harvard', two natural hybrids of P. deltoides and one sample of P. laurifolia) and analysed with five restriction enzymes. The results show that although the cpDNA diversity between Sect. Tacamahaca Spach. and Sect. Aigeiros Duby is low, they can be distinguished by using the restriction fragment length polymorphisms (RFLP) generated by EcoR I and BamH I. The RFLP generated by BamH I can also be used to distinguish the two natural hybrids of P. deltodes. So the analysis of Poplar cpDNA RFLP provides a molecular biological method for Poplar classification, cross breeding program and phylogenetic studies.
Chloroplast DNA (cpDNA) were prepared from five Poplar samples (two hybrids of Populus deltoides Bartr. CL.‘Lux'×P. deltoides Bartr. CL. ‘Harvard', two natural hybrids of P. deltoides and one sample of P. laurifolia) and analysed with five restriction enzymes. The results show that although the cpDNA diversity between Sect. Tacamahaca Spach. and Sect. Aigeiros Duby is low, they can be distinguished by using the restriction fragment length polymorphisms (RFLP) generated by EcoR I and BamH I. The RFLP generated by BamH I can also be used to distinguish the two natural hybrids of P. deltodes. So the analysis of Poplar cpDNA RFLP provides a molecular biological method for Poplar classification, cross breeding program and phylogenetic studies.
1992, 5(4): 469-473.
Abstract:
Abstract This paper presents a method of color composite image on microcomputer which works through resetting the value every DAC register of all 256 DACs on microcomputer according to the three band's satellite data which was used to composite color image. It also gives a brief introduction to the software of MCRGB programmed in this method. It proves to be useful and essential to all the units related to remote sensing.
Abstract This paper presents a method of color composite image on microcomputer which works through resetting the value every DAC register of all 256 DACs on microcomputer according to the three band's satellite data which was used to composite color image. It also gives a brief introduction to the software of MCRGB programmed in this method. It proves to be useful and essential to all the units related to remote sensing.
1992, 5(4): 474-477.
Abstract:
Two preparations of antagonistic bacteria, Pseudomonas sp. (P751), Bacillus cereus Fr. (Bc 752)——NONGFENGJUN were mixed separately with the seeds of Pinus massoniana Lamb, on large scale cultivation pf air sowing. In 10 533 hm2 trial area, the result shows that the effect of NONGFENGJUN No.2 (P 751) is better that of No.1 (Bc 752). The effect of air sowing increased by an average of 39.5%, the averege seedling height by 31.0%, the average length of seedling needle by 14.0%, the average seedling number by area by 79.9% and the average incidence of diseases, Cercospora pini-densiflorae and dampping-off are reduced by 67.3%. The average effect of diseases control is 97.8%. The effect of Bc 752 is better than that of P 751, reducing the average incidence of diseases by 97.9%.
Two preparations of antagonistic bacteria, Pseudomonas sp. (P751), Bacillus cereus Fr. (Bc 752)——NONGFENGJUN were mixed separately with the seeds of Pinus massoniana Lamb, on large scale cultivation pf air sowing. In 10 533 hm2 trial area, the result shows that the effect of NONGFENGJUN No.2 (P 751) is better that of No.1 (Bc 752). The effect of air sowing increased by an average of 39.5%, the averege seedling height by 31.0%, the average length of seedling needle by 14.0%, the average seedling number by area by 79.9% and the average incidence of diseases, Cercospora pini-densiflorae and dampping-off are reduced by 67.3%. The average effect of diseases control is 97.8%. The effect of Bc 752 is better than that of P 751, reducing the average incidence of diseases by 97.9%.
1992, 5(4): 478-482.
Abstract:
Attractants can be used to trap mass Monochamus alternatus during the period of feeding and oviposition, and also other beetles, such as Arhopalus unicolor, Hyposipalus gigaus, Shirahoshizo patruelis, etc. Compared with the attractant of Japanese product, the trapping rate through using the self-prepared attractant to the above-mentioned beetles has increased by 0.29, 2.5, and 1.2 times respectively. Having been controlled by means of the attractant in Pine stands, the population density of M. alternatus, etc, and the withered rate of Pine trees can be greatly reduced. After putting attractant I into Pine trees and keeping for two months, the trapping effect is remarkable, especially in the first month.
Attractants can be used to trap mass Monochamus alternatus during the period of feeding and oviposition, and also other beetles, such as Arhopalus unicolor, Hyposipalus gigaus, Shirahoshizo patruelis, etc. Compared with the attractant of Japanese product, the trapping rate through using the self-prepared attractant to the above-mentioned beetles has increased by 0.29, 2.5, and 1.2 times respectively. Having been controlled by means of the attractant in Pine stands, the population density of M. alternatus, etc, and the withered rate of Pine trees can be greatly reduced. After putting attractant I into Pine trees and keeping for two months, the trapping effect is remarkable, especially in the first month.
1992, 5(4): 483-486.
Abstract:
This paper deals with the correlation analysis in population density of Matsucoccus matsumurae and bark type as well as chemical content of 5 resistant and 3 susceptible provenances of Pinus massoniana. Results showed that bark type played a major role to show that whether a provenance was resistant to the insect or not. Nymph populations, under the same condition, were found to be significantly higher in provenances with thinner bark than that with thicker bark. There is a correlation coefficient up to -0.8786. Analysis of 29 chemical contents showed significant differences between resistant and susceptible provenances. Total sugar and free amino acids were markedly higher in the susceptible ones, especially the isoleucine, lysine and alanine.
This paper deals with the correlation analysis in population density of Matsucoccus matsumurae and bark type as well as chemical content of 5 resistant and 3 susceptible provenances of Pinus massoniana. Results showed that bark type played a major role to show that whether a provenance was resistant to the insect or not. Nymph populations, under the same condition, were found to be significantly higher in provenances with thinner bark than that with thicker bark. There is a correlation coefficient up to -0.8786. Analysis of 29 chemical contents showed significant differences between resistant and susceptible provenances. Total sugar and free amino acids were markedly higher in the susceptible ones, especially the isoleucine, lysine and alanine.
1992, 5(4): 487-491.
Abstract:
This paper deals with the comparative study on cold resistance of 13 provenances of Black Wattle (Acacia mearnsii) by methods of electro -conductance, growth restoration test, refractometer and tetragolium (TTC) The results showed a similar trend of cold resistance in various provenances. There are three provenances (11, 12, y) with stronger cold resistance and four provenances (16, C1,C2, B) with weaker cold resistance. The characters of these four methods and their application prospect in determination of cold resistance of Black Wattle have been discussed. According to the condition of instrument, it was suggested to determine cold resist ance by an applicable method.
This paper deals with the comparative study on cold resistance of 13 provenances of Black Wattle (Acacia mearnsii) by methods of electro -conductance, growth restoration test, refractometer and tetragolium (TTC) The results showed a similar trend of cold resistance in various provenances. There are three provenances (11, 12, y) with stronger cold resistance and four provenances (16, C1,C2, B) with weaker cold resistance. The characters of these four methods and their application prospect in determination of cold resistance of Black Wattle have been discussed. According to the condition of instrument, it was suggested to determine cold resist ance by an applicable method.
1992, 5(4): 492-496.
Abstract:
Through studying and analysing the effects of fertilizationon the growth of the seedlings of Acacia mangium, application of phosphatefertilizer and inoculation of nodule bacteria are proposed in the paper. Application of nitrogen fertilizer in the too early stage or excessively used are unsuitable to the growth of young seedlings.In the pot culture experiment, application of different amount of phosphate fertilizer has known that it can increase the growth of height, canopy and ground diameter, biomass accumulation, nodule number and nodule dry weight, but the ratio of above ground dry weight/under ground dry weight can not be changed. Applying 100g phosphate fertilizer for each seedling is the best choice.
Through studying and analysing the effects of fertilizationon the growth of the seedlings of Acacia mangium, application of phosphatefertilizer and inoculation of nodule bacteria are proposed in the paper. Application of nitrogen fertilizer in the too early stage or excessively used are unsuitable to the growth of young seedlings.In the pot culture experiment, application of different amount of phosphate fertilizer has known that it can increase the growth of height, canopy and ground diameter, biomass accumulation, nodule number and nodule dry weight, but the ratio of above ground dry weight/under ground dry weight can not be changed. Applying 100g phosphate fertilizer for each seedling is the best choice.
Subvmission Guidelines
Peer Review
Reviewer Online
Office Work
Email alert
RSS