1992 Vol. 5, No. 2
Display Method:
1992, 5(2): 127-133.
[Abstract]
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Abstract:
It was found that there are rich family genetic variation in growth and branch traits of Masson Pine, and it is possible to acquire moderate genetic gain through selection. Tree height, basal diameter, crown, branch length and angle are under moderate and strong genetic controlls, while branch number and thickness are under weak and moderate genetic controlls. The significant genotype × environment interaction was found for tree height and base diameter. 40 better families could be selected using method of breeding value evaluation.
It was found that there are rich family genetic variation in growth and branch traits of Masson Pine, and it is possible to acquire moderate genetic gain through selection. Tree height, basal diameter, crown, branch length and angle are under moderate and strong genetic controlls, while branch number and thickness are under weak and moderate genetic controlls. The significant genotype × environment interaction was found for tree height and base diameter. 40 better families could be selected using method of breeding value evaluation.
1992, 5(2): 134-141.
Abstract:
This paper reported the physiological characteristic of Castanopsis hystrix A. DC. seeds as "recalcitrant". Through a series of experiments, tests and analysis, it was found that the principal conditions for their storage are: suitable low temperature 15~20℃, most suitable moisture content of seed 36%~37% and the measures of effective prevention in getting mould which included the treatment with suitable antiseptic agent solution and slow aeration. To control the most suitable moisture content may be achieved by adjusting the moisture content of coconut dust mixed as a medium at about 25% above 25℃, or 30% below 20℃.
This paper reported the physiological characteristic of Castanopsis hystrix A. DC. seeds as "recalcitrant". Through a series of experiments, tests and analysis, it was found that the principal conditions for their storage are: suitable low temperature 15~20℃, most suitable moisture content of seed 36%~37% and the measures of effective prevention in getting mould which included the treatment with suitable antiseptic agent solution and slow aeration. To control the most suitable moisture content may be achieved by adjusting the moisture content of coconut dust mixed as a medium at about 25% above 25℃, or 30% below 20℃.
1992, 5(2): 142-148.
Abstract:
The research on the variation among and within ecotypes of Pinus tabulaeformis was conducted and the differences among the provenances from different elevation origins in the same ecotype was also studied. The results show that there are significant differences in growth both among the ecotypes and differences within the ecotypes. Moreover, the variations among the ecotypes are more important than those within the ecotypes. No significant differences were found among the provenances from different elevation origins in the same ecotype.
The research on the variation among and within ecotypes of Pinus tabulaeformis was conducted and the differences among the provenances from different elevation origins in the same ecotype was also studied. The results show that there are significant differences in growth both among the ecotypes and differences within the ecotypes. Moreover, the variations among the ecotypes are more important than those within the ecotypes. No significant differences were found among the provenances from different elevation origins in the same ecotype.
1992, 5(2): 149-157.
Abstract:
Based on the sampling of the plot and check, the paper discusses the distributive pattern of five principal tree populations in two Mangrove Communities of Bruguiera sexangula and B. gymnorrhiza in Qinglan Harbour, Hainan Province using five methods. The result shows that the pattern of Excoecaria agallocha and Rhizophora apiculata is clump, B. gymnorrhiza is random, the others can not be distinguished completely and be considered as a transitive type between clump and random. The concrete causes led to the patterns of these populations are approached and a suggestion on management and afforestation is made.
Based on the sampling of the plot and check, the paper discusses the distributive pattern of five principal tree populations in two Mangrove Communities of Bruguiera sexangula and B. gymnorrhiza in Qinglan Harbour, Hainan Province using five methods. The result shows that the pattern of Excoecaria agallocha and Rhizophora apiculata is clump, B. gymnorrhiza is random, the others can not be distinguished completely and be considered as a transitive type between clump and random. The concrete causes led to the patterns of these populations are approached and a suggestion on management and afforestation is made.
1992, 5(2): 158-162.
Abstract:
This paper is a report on the interrelations of forest precipitation, crown interception and trunk stemflow in Cunninghamia lanceolata and Pinus massoniana plantations distributed over the hill-foot areas in Fenyi County, Jiangxi Province. The study, worked by means of regression analysis, has shown that in this forest the rate of forest precipitation and trunk stemflow increases sharply with the rise of rainfall; the rate of crown interception increases in the range of power function along with the rise of rainfall. In C. lanceolata plantations, however, the rise of canopy density results in the fall of forest precipitation and trunk stemflow, but the increase of canopy interception. In comparison with C. lanceolata, the forest precipitation and trunk stemflow for P. massoniana are bigger, but its crown interception is smaller.
This paper is a report on the interrelations of forest precipitation, crown interception and trunk stemflow in Cunninghamia lanceolata and Pinus massoniana plantations distributed over the hill-foot areas in Fenyi County, Jiangxi Province. The study, worked by means of regression analysis, has shown that in this forest the rate of forest precipitation and trunk stemflow increases sharply with the rise of rainfall; the rate of crown interception increases in the range of power function along with the rise of rainfall. In C. lanceolata plantations, however, the rise of canopy density results in the fall of forest precipitation and trunk stemflow, but the increase of canopy interception. In comparison with C. lanceolata, the forest precipitation and trunk stemflow for P. massoniana are bigger, but its crown interception is smaller.
1992, 5(2): 163-169.
Abstract:
Cephalotaxus mannii Hook. f. is a raw material resources of new medicine used for anti-cancer (leukaemia), which was found in 1970's in China. The natural resources of the plant is now being less and less. Protecting and establishing this raw medicinal resources base become more and more important. An investigation on the early growth performance of a 14-year-old plantation of C. mannii under un-extensive management was carried out at Jianfengling Forest Region, Hainan Province of China. It was showed that the mean annual increment (m.a.i.) was 0.42 cm in DBH, 0.39 m in tree height, 0.72m3 in volume (o.b.v.) and the total aboveground biomass (TAGB) was 7.678t/ha, the net production (excluding tree litter) was 0.548 t/ha/a with 833 individuals per ha in tree density. Although the stand productivity was low, the economic value of the medicine was high up to 800 thousand Yuan(RMB) per ha according to the harringtonine and homo-harringtonine in the bark biomass and their market price in 1989. Finally, the cultivating prospect of C. mannii also been discussed in this paper.
Cephalotaxus mannii Hook. f. is a raw material resources of new medicine used for anti-cancer (leukaemia), which was found in 1970's in China. The natural resources of the plant is now being less and less. Protecting and establishing this raw medicinal resources base become more and more important. An investigation on the early growth performance of a 14-year-old plantation of C. mannii under un-extensive management was carried out at Jianfengling Forest Region, Hainan Province of China. It was showed that the mean annual increment (m.a.i.) was 0.42 cm in DBH, 0.39 m in tree height, 0.72m3 in volume (o.b.v.) and the total aboveground biomass (TAGB) was 7.678t/ha, the net production (excluding tree litter) was 0.548 t/ha/a with 833 individuals per ha in tree density. Although the stand productivity was low, the economic value of the medicine was high up to 800 thousand Yuan(RMB) per ha according to the harringtonine and homo-harringtonine in the bark biomass and their market price in 1989. Finally, the cultivating prospect of C. mannii also been discussed in this paper.
1992, 5(2): 170-176.
Abstract:
The water content of Emblic (Phyllanthus emblica L.) flesh is from 84.94% to 88.13% and the content order is as follows for different cultivar (or types): Sui (fringe) typeFen GanXian FengWild population (Nanan and Huian county)Da BaiZao GanFeng-1. There is a distinct difference in TSS among the cultiver (or types). The TSS of good fruits in the same sampling vary a little in the procedure of storage and the TSS of fruits in airy condition is higher than that in bag storage. The TSS decreases if the fruits are rot. According to the results of the analysis with high performance liquid chromatography, the fresh of fruits contains 16 kinds of amino acids and among which, 7 kinds are necessary for the mankind. The content of Vitaminc (Vc) is high and it's remarkably different among cultivar (or types). The Vc content of Summer fruits is bigger than that of Spring fruits during the early development of fruits. The Vc content decreases after September and the decrement rate of fresh Vc has positive relationship with it's original Vc content. The Vc of Emblic fresh has high stability. There are high macroelements and many kinds of microelements in the fresh, juice, dregs and sediment of Emblic. The Emblic fresh contains starch, cellulose, hemicellulose,sucrose, many kinds of monose and 3%~5% tanin.
The water content of Emblic (Phyllanthus emblica L.) flesh is from 84.94% to 88.13% and the content order is as follows for different cultivar (or types): Sui (fringe) typeFen GanXian FengWild population (Nanan and Huian county)Da BaiZao GanFeng-1. There is a distinct difference in TSS among the cultiver (or types). The TSS of good fruits in the same sampling vary a little in the procedure of storage and the TSS of fruits in airy condition is higher than that in bag storage. The TSS decreases if the fruits are rot. According to the results of the analysis with high performance liquid chromatography, the fresh of fruits contains 16 kinds of amino acids and among which, 7 kinds are necessary for the mankind. The content of Vitaminc (Vc) is high and it's remarkably different among cultivar (or types). The Vc content of Summer fruits is bigger than that of Spring fruits during the early development of fruits. The Vc content decreases after September and the decrement rate of fresh Vc has positive relationship with it's original Vc content. The Vc of Emblic fresh has high stability. There are high macroelements and many kinds of microelements in the fresh, juice, dregs and sediment of Emblic. The Emblic fresh contains starch, cellulose, hemicellulose,sucrose, many kinds of monose and 3%~5% tanin.
1992, 5(2): 177-181.
Abstract:
Seed vigour of Larix gmelini Rupr. has been studied by vertical plate germinator. (1) Height of seedling were measured,germination index and vigour index were caculated. (2) Seedlings were classified into five classes according to the radicle, seedling height and seminal leaf. To avoid the error caused by subjective judgment, the author has classified the seedling height by its standard deviation, as a result strong seedling percent and seedling stand percent were determined. In consequence the seedling classification was improved. (3) The most suitable pretreatment methods for raising Larix gmelini seed vigour were screened out.
Seed vigour of Larix gmelini Rupr. has been studied by vertical plate germinator. (1) Height of seedling were measured,germination index and vigour index were caculated. (2) Seedlings were classified into five classes according to the radicle, seedling height and seminal leaf. To avoid the error caused by subjective judgment, the author has classified the seedling height by its standard deviation, as a result strong seedling percent and seedling stand percent were determined. In consequence the seedling classification was improved. (3) The most suitable pretreatment methods for raising Larix gmelini seed vigour were screened out.
1992, 5(2): 182-187.
Abstract:
Ulmus laciniata Mayr. is a precious broadleaf timber tree species in north-east of China. In the paper, on U. laciniata, procedure of pregermination, sowed norm, retaining seedling density, fertilization,etc. were studied comprehensively and systematically. The results indicated that germination rate of fresh sand-mixed seeds in grean house is 47.6%. If the seeds are not pregerminated, its germination rate is 13.6%. The suitable amount of fresh seeds or air-dried seeds for sowing is 315~375 kg/ ha or 90~150 kg/ha respectively. The best retaining seedling density is 0.36 million seedling/ha. The techniques of raising seedlings of U. laciniata characterized by low cost and more economical benefit.
Ulmus laciniata Mayr. is a precious broadleaf timber tree species in north-east of China. In the paper, on U. laciniata, procedure of pregermination, sowed norm, retaining seedling density, fertilization,etc. were studied comprehensively and systematically. The results indicated that germination rate of fresh sand-mixed seeds in grean house is 47.6%. If the seeds are not pregerminated, its germination rate is 13.6%. The suitable amount of fresh seeds or air-dried seeds for sowing is 315~375 kg/ ha or 90~150 kg/ha respectively. The best retaining seedling density is 0.36 million seedling/ha. The techniques of raising seedlings of U. laciniata characterized by low cost and more economical benefit.
1992, 5(2): 188-192.
Abstract:
Effects of deltamethrin on the nemo lymph esterases activity (HEA) of the 5th instar larvae of Dendrolimus punctatus were studied. For the untreated larvae, both the summer larvae and the larvae after hibernation have a∽-form curve in the daily dynamic changes of HEA. The results also showed that the daily dynamic changes of HEA were negatively correlated with those of hemolymph lipid content(HLC), and positively with hemolymph carbohydrate content(HCC). The treatment of sublethal doses (LD5) of deltamethrin could cause a positive correlatoin between HEA and HLC in both susceptible strain and tolerant strain, and a negative correlat on between HEA and HCC in the tolerant strain. The activity of hemolymph esterases was found to be closely related to the poisoning syndrome of the deltamethrin. For the susceptible strain, the HEA depleted at the knocking down and conveulsive stages, elevated at exiting and recovering or dying stages. Whereas in the tolerant strain, the HEA depleted at the knocking down stage only, and elevated gradually than after. In those two strains, the levels of HEA in the recovering and dying larvae were the same, this indicated that the hemolymph esterases play a less important part in the lethal effects caused by deltamethrin. Finally the importance of hemolymph esterases in the metabolism of hemolymph lipid and carbohydrate were dicussed.
Effects of deltamethrin on the nemo lymph esterases activity (HEA) of the 5th instar larvae of Dendrolimus punctatus were studied. For the untreated larvae, both the summer larvae and the larvae after hibernation have a∽-form curve in the daily dynamic changes of HEA. The results also showed that the daily dynamic changes of HEA were negatively correlated with those of hemolymph lipid content(HLC), and positively with hemolymph carbohydrate content(HCC). The treatment of sublethal doses (LD5) of deltamethrin could cause a positive correlatoin between HEA and HLC in both susceptible strain and tolerant strain, and a negative correlat on between HEA and HCC in the tolerant strain. The activity of hemolymph esterases was found to be closely related to the poisoning syndrome of the deltamethrin. For the susceptible strain, the HEA depleted at the knocking down and conveulsive stages, elevated at exiting and recovering or dying stages. Whereas in the tolerant strain, the HEA depleted at the knocking down stage only, and elevated gradually than after. In those two strains, the levels of HEA in the recovering and dying larvae were the same, this indicated that the hemolymph esterases play a less important part in the lethal effects caused by deltamethrin. Finally the importance of hemolymph esterases in the metabolism of hemolymph lipid and carbohydrate were dicussed.
1992, 5(2): 193-195.
Abstract:
This paper describes two new sawflies of the genus Gilpinia, which attack the pine trees severely. The type-specimens are deposited in the collection of the Research Institute of Forestry, the Chinese Academy of Forestry, Beijing, China.
This paper describes two new sawflies of the genus Gilpinia, which attack the pine trees severely. The type-specimens are deposited in the collection of the Research Institute of Forestry, the Chinese Academy of Forestry, Beijing, China.
1992, 5(2): 196-202.
Abstract:
Gilpinia massoniana is a new forest pest occurred in Changchong Forest Farm of Chu County, Anhui Province, whose major host is Pinus massoniana. According to the survey conducted in May, 1991, the area infested by the pest was about 9000mu. It has 2 generations a year. It pupates under the litter, in the root part of the grass or in the soil from mid-June to early July and from late October to mid-November, and aestivatea and hibernates by prepupa. The larva has 6 instars, feeding on an average of 573.1 cm of the needle during the period of lst~5th instar. After entering into the 6th instar, the larva feeds on nothing and makes cocoon in 5 hours to 2 days. The sex ratio of the adults is 1:1. After mating, the female lays eggs on the needles, the average number of an egg mass is 87.6. It mainly distributes in the pure P. massoniana forest of 20~30 years old, especially in the sparse forest and forest border. The pest can be effectively controlled by 10% Fenvalerate or 10% Mevinphos.
Gilpinia massoniana is a new forest pest occurred in Changchong Forest Farm of Chu County, Anhui Province, whose major host is Pinus massoniana. According to the survey conducted in May, 1991, the area infested by the pest was about 9000mu. It has 2 generations a year. It pupates under the litter, in the root part of the grass or in the soil from mid-June to early July and from late October to mid-November, and aestivatea and hibernates by prepupa. The larva has 6 instars, feeding on an average of 573.1 cm of the needle during the period of lst~5th instar. After entering into the 6th instar, the larva feeds on nothing and makes cocoon in 5 hours to 2 days. The sex ratio of the adults is 1:1. After mating, the female lays eggs on the needles, the average number of an egg mass is 87.6. It mainly distributes in the pure P. massoniana forest of 20~30 years old, especially in the sparse forest and forest border. The pest can be effectively controlled by 10% Fenvalerate or 10% Mevinphos.
1992, 5(2): 203-206.
Abstract:
Bombax ceiba Linnaeus is a special kind of economic plant. Cinnamomum loureirii Nees is a rare traditional Chinese medicine. Both of them are damaged by small caterpillars over many years. Through identification, one is a new record and the other is new to science.Type specimens are preserved in the Institute of Zoology, Academia Sinica.
Bombax ceiba Linnaeus is a special kind of economic plant. Cinnamomum loureirii Nees is a rare traditional Chinese medicine. Both of them are damaged by small caterpillars over many years. Through identification, one is a new record and the other is new to science.Type specimens are preserved in the Institute of Zoology, Academia Sinica.
1992, 5(2): 207-209.
Abstract:
In this paper, Micadina yingdensis sp. nov. (figs.1~4; from Guangdong Province of China is described. The type specimens are deposited in the Insect Museum of Beijing Forestry University.
In this paper, Micadina yingdensis sp. nov. (figs.1~4; from Guangdong Province of China is described. The type specimens are deposited in the Insect Museum of Beijing Forestry University.
1992, 5(2): 210-213.
Abstract:
This article reviews the great accomplishments in lac researches and the remarkable results obtained through popularization of them in the past. Problems in the lac research and cultivation have been pointed out and the ways to solve them proposed and the future development discussed.
This article reviews the great accomplishments in lac researches and the remarkable results obtained through popularization of them in the past. Problems in the lac research and cultivation have been pointed out and the ways to solve them proposed and the future development discussed.
1992, 5(2): 214-218.
Abstract:
To develop short-rotation industrial plantation is an useful way to alleviaten the crisis of forest resources China and is useful for the coordination of the contradiction between economic and ecological use of forests. Recently, a lot of land used for developing the short-rotation industrial plantation are of low soil fertility, and the productivity of successive plantation on these lands is decreasing because of the degradation of soil fertility, largely due to the limitation of natural, social, and economic conditions. For consuming up a lot of soil nutrients, the short-rotation industrisl plantation could not absorb enough inherent nutrients from soil for its normal growth. It takes long time to restore soil fertility by biological ways such as mixed cropping and rotation of crops etc., and it is difficult to increase the soil fertility in the near future by these ways, so plantation fertilization, like the application of superior seeds,is necessary to cultivate the short-rotation industrial plantations.
To develop short-rotation industrial plantation is an useful way to alleviaten the crisis of forest resources China and is useful for the coordination of the contradiction between economic and ecological use of forests. Recently, a lot of land used for developing the short-rotation industrial plantation are of low soil fertility, and the productivity of successive plantation on these lands is decreasing because of the degradation of soil fertility, largely due to the limitation of natural, social, and economic conditions. For consuming up a lot of soil nutrients, the short-rotation industrisl plantation could not absorb enough inherent nutrients from soil for its normal growth. It takes long time to restore soil fertility by biological ways such as mixed cropping and rotation of crops etc., and it is difficult to increase the soil fertility in the near future by these ways, so plantation fertilization, like the application of superior seeds,is necessary to cultivate the short-rotation industrial plantations.
1992, 5(2): 219-224.
Abstract:
This paper is based on the blown wind and sand experiment of nine different structures of sand-shifting control forests in a wind tunnel. The results are as follows: (1) Wind tunnel simulation experiment results and those got from survey and studies on sand-shifting control forest belts of different structure in field have the same regularity.(2) When tracts of shrub forests have certain coverage, the variation of plantation coverage has slight influence on sand-control effects. (3) Being affected ty forest belts, the feature of accumulated sand distribution is determined by the structure of forest belt. The corresponding type of forest belt and the most suitable coefficient of porosity can be selected according to different protected objects.
This paper is based on the blown wind and sand experiment of nine different structures of sand-shifting control forests in a wind tunnel. The results are as follows: (1) Wind tunnel simulation experiment results and those got from survey and studies on sand-shifting control forest belts of different structure in field have the same regularity.(2) When tracts of shrub forests have certain coverage, the variation of plantation coverage has slight influence on sand-control effects. (3) Being affected ty forest belts, the feature of accumulated sand distribution is determined by the structure of forest belt. The corresponding type of forest belt and the most suitable coefficient of porosity can be selected according to different protected objects.
1992, 5(2): 225-230.
Abstract:
Ivestigations were conducted during the drought and after the drought on the growth, nodulation and nitrogen-fixation of Alnus cremastogyne Burk planted in local soils of three typical categories. The results showed: 4-year-old or over 4-year-old A. cremastogyne had fairly high drought-resistance, but A. cremastogyne of three years old or younger are sensitive to drought. The trees damaged by the drought the most in river alluvial deposit soil, the second in hangh red soil, the third in gully fen aging red soil. Drought killed many trees of A. cremastogyne, the nitrogen content in leaves of the survivors decreased. Leaves, roots and nodules of the survivors partly withered. Drought also made nitrogen-fixation activity of root nodules dropped down to zero. After drought at least two months are needed for A. cremastogyne to recover. Although A. cremastogyne which grew in gully fen aging red soil didn't suffer much from drought during drought period, whereas in raining season when the soil was filled with water the growth of roots and nodules of A. cremastogyne stopped. Therefore from July to November the growth and nitrogen-fixation amount of A. cremastogyne cultivated in local soil were far less than that grew in the original place.
Ivestigations were conducted during the drought and after the drought on the growth, nodulation and nitrogen-fixation of Alnus cremastogyne Burk planted in local soils of three typical categories. The results showed: 4-year-old or over 4-year-old A. cremastogyne had fairly high drought-resistance, but A. cremastogyne of three years old or younger are sensitive to drought. The trees damaged by the drought the most in river alluvial deposit soil, the second in hangh red soil, the third in gully fen aging red soil. Drought killed many trees of A. cremastogyne, the nitrogen content in leaves of the survivors decreased. Leaves, roots and nodules of the survivors partly withered. Drought also made nitrogen-fixation activity of root nodules dropped down to zero. After drought at least two months are needed for A. cremastogyne to recover. Although A. cremastogyne which grew in gully fen aging red soil didn't suffer much from drought during drought period, whereas in raining season when the soil was filled with water the growth of roots and nodules of A. cremastogyne stopped. Therefore from July to November the growth and nitrogen-fixation amount of A. cremastogyne cultivated in local soil were far less than that grew in the original place.
1992, 5(2): 231-235.
Abstract:
The cultural conditions for the proliferation of a strain, SF-86902 selected from Pisolithas tinotorius (P.t),a species of symbiotic fungi with Masson Pine, have been studied. The results showed that under artificial pure-culture, the optimum growth temperature was 25℃; the optimum pH in the culture solution was 5.5; the sources of carbon and nitrogen which are easily absorbed and used were monosac glucose and inorganic ammonium nitrogen respectively. The research provided scientific basis for preparing mycorrhiza inoculum by the P.t fungus of ectotrophic mycorrhiza with Masson Pine.
The cultural conditions for the proliferation of a strain, SF-86902 selected from Pisolithas tinotorius (P.t),a species of symbiotic fungi with Masson Pine, have been studied. The results showed that under artificial pure-culture, the optimum growth temperature was 25℃; the optimum pH in the culture solution was 5.5; the sources of carbon and nitrogen which are easily absorbed and used were monosac glucose and inorganic ammonium nitrogen respectively. The research provided scientific basis for preparing mycorrhiza inoculum by the P.t fungus of ectotrophic mycorrhiza with Masson Pine.
1992, 5(2): 236-238.
Abstract:
This paper reports the cross breeding test of lac insects in China. The results have shown that these different species of lac insects (Kerria lacca, K. sindica, K. chinensis, K. fici) can be alternatively crossed without barrier. The crossing test has also shown that the crossing between K. sindica and K. lacca is amphimictic.
This paper reports the cross breeding test of lac insects in China. The results have shown that these different species of lac insects (Kerria lacca, K. sindica, K. chinensis, K. fici) can be alternatively crossed without barrier. The crossing test has also shown that the crossing between K. sindica and K. lacca is amphimictic.
1992, 5(2): 239-242.
Abstract:
Forestry division in county level is a basic work for the lorestry modernization. The field work would be decreased as the remote sensing data are used, and we can extract the newest and more complete information from the data. The forestry division would be more objective and scientific if the cluster analysis method is adopted.
Forestry division in county level is a basic work for the lorestry modernization. The field work would be decreased as the remote sensing data are used, and we can extract the newest and more complete information from the data. The forestry division would be more objective and scientific if the cluster analysis method is adopted.
1992, 5(2): 243-248.
Abstract:
A linear relationship exists between the diameter breast height (D. B. H.) and the crown diameter. The equations (W=A+BD) of all key plots have been worked out, then the discrepant inspection of A and B in all of the key plots inside the bureau and among the bureaus were conducted. The result is that there is a discrepancy in A but not in B.As a general rule the crown decreases as the height increases, [a linear regression between A and Hr (even superior height) was made. The equation for the crown was established. The tree numbers calculated by the equation are the largest theoretical density and the parts of the Crown overlapping was added to achieve a suitable density. Then suitable management density tables of L. gmelini, located in the midst of Ya Ke Shi area, were worked out for both plantations and natural stands.The practical inspection of these tables was made. It appears that the tables are useful for forestry management.
A linear relationship exists between the diameter breast height (D. B. H.) and the crown diameter. The equations (W=A+BD) of all key plots have been worked out, then the discrepant inspection of A and B in all of the key plots inside the bureau and among the bureaus were conducted. The result is that there is a discrepancy in A but not in B.As a general rule the crown decreases as the height increases, [a linear regression between A and Hr (even superior height) was made. The equation for the crown was established. The tree numbers calculated by the equation are the largest theoretical density and the parts of the Crown overlapping was added to achieve a suitable density. Then suitable management density tables of L. gmelini, located in the midst of Ya Ke Shi area, were worked out for both plantations and natural stands.The practical inspection of these tables was made. It appears that the tables are useful for forestry management.
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