1989 Vol. 2, No. 1
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1989, 2(1): 1-8.
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Abstract:
The fertilization and the development of endosperm and embryo of Populus euphiatica Oliv.have been studied.The results are summarized as follows;1.The stigma is of wet type.The exudate that stained red with Sudan Ⅳ is derived from the glandular stigmatic surface cells.The cuticle gives a clear green fluorescence following auramine O staining,2.48 hours after pollination,two sperm cells are seen in the pollen tube within the ovarian cavity.Each sperm cell contains a large nucleus that is surrounded by cytoplasm.The nucleus is spherical,about 2.5-3.0 μm in diameter,with a prominent nucleolus.3.Fertilization takes place in 8-13 days after pollination.The pollen tube enters the ovule through the micropyle (porogamy).The sperm nucleolus is more distinctive during the fusion of the male and female nuclear membranes.The male and female nucleoli fused together to form a new nucleolus,the fertilized egg nucleolus.4.The endosperm is of nuclear type.Cellularization begins at globular embryo stage and completes its process at heart-shaped embryo stage.The growth curve correlations of the endosperm and embryo show that the nuclear endosperm does not have a significant role in nourishing the proembryo during embryogenesis,but the cellular endosperm do provide nutrition to the developing embryo.5.After resting for 19 days,the zygote divides transversely,resulting in an apical cell and a basal cell.The apical cell divides transversely or longitudinally to form a linear or T-shaped proembryo.Globular embryo stage lasts for 10 days.Growth of the embryo follows the pattern of a typical S-shaped curve.6.Timetable from pollination of the flower to fruit maturity has been given.
The fertilization and the development of endosperm and embryo of Populus euphiatica Oliv.have been studied.The results are summarized as follows;1.The stigma is of wet type.The exudate that stained red with Sudan Ⅳ is derived from the glandular stigmatic surface cells.The cuticle gives a clear green fluorescence following auramine O staining,2.48 hours after pollination,two sperm cells are seen in the pollen tube within the ovarian cavity.Each sperm cell contains a large nucleus that is surrounded by cytoplasm.The nucleus is spherical,about 2.5-3.0 μm in diameter,with a prominent nucleolus.3.Fertilization takes place in 8-13 days after pollination.The pollen tube enters the ovule through the micropyle (porogamy).The sperm nucleolus is more distinctive during the fusion of the male and female nuclear membranes.The male and female nucleoli fused together to form a new nucleolus,the fertilized egg nucleolus.4.The endosperm is of nuclear type.Cellularization begins at globular embryo stage and completes its process at heart-shaped embryo stage.The growth curve correlations of the endosperm and embryo show that the nuclear endosperm does not have a significant role in nourishing the proembryo during embryogenesis,but the cellular endosperm do provide nutrition to the developing embryo.5.After resting for 19 days,the zygote divides transversely,resulting in an apical cell and a basal cell.The apical cell divides transversely or longitudinally to form a linear or T-shaped proembryo.Globular embryo stage lasts for 10 days.Growth of the embryo follows the pattern of a typical S-shaped curve.6.Timetable from pollination of the flower to fruit maturity has been given.
1989, 2(1): 9-14.
Abstract:
Nestling growth,feeding amounts and percent occurrence of masson pine moth (Dendrolimus punctatus) in the nestling diet of great tit (Pa-rus major) during the first nestling periods for 4 years were investigated at Long Shan Farm,northern part of Zhejiang province where the densities of masson pine moth changed regularly from 1967-1988.
Nestling growth,feeding amounts and percent occurrence of masson pine moth (Dendrolimus punctatus) in the nestling diet of great tit (Pa-rus major) during the first nestling periods for 4 years were investigated at Long Shan Farm,northern part of Zhejiang province where the densities of masson pine moth changed regularly from 1967-1988.
1989, 2(1): 15-24.
Abstract:
The present study was conducted to seek the diagnoses of bamboo nutrient state so as to guide its fertilization.Research contents included methods of tissue sampling for foliage analysis,and evaluation of nutrient status of field bamboo fertilizer experiments by the traditional critical value method and DRIS method which has been developed recently.The results are as follows:1.Tissue samples used for foliage diagnoses should be collected during the middle of shooting stage,and from the median branches of crown with 2-year age bamboo trees.In order to represent the nutrient content of plants,5 single bamboos,at least,were needed to be collected for a mean sample.2.Critical value standards were affected by the structure of standing bamboos.As standing bamboos had more than 250 culms per mu (1/15 ha),N,P critical values were respectively 2.6% and 0.13%; optimum values were 2.8% and 0.16%.With sparse standing bamboo trees,or of which top parts of crown were cut off,N critical and optimum values appeared to be a little high up to 2.9% and 3.1%.The output responses of new culms,accumulating in 3 years,agreed with N,P concentration levels.3.DRIS reference values were obtained from the high-yield population of fertilizer experiments (yield 3500kg per mu).DRIS method was evaluated utilizing 4 data sets of N,P,K,Si.In general,where the critical value method made a diagnosis,it agreed with DRIS.DRIS had advantage over the critical value method to assess the status of nutrient balance of plant and nutrient order of requirement.But incorrect diagnoses might occur as nutrients were relative insufficencies or excesses.Considering the variety of forest sites,both the above methods should be recommended together for nutrient diagnoses in bamboo forests.
The present study was conducted to seek the diagnoses of bamboo nutrient state so as to guide its fertilization.Research contents included methods of tissue sampling for foliage analysis,and evaluation of nutrient status of field bamboo fertilizer experiments by the traditional critical value method and DRIS method which has been developed recently.The results are as follows:1.Tissue samples used for foliage diagnoses should be collected during the middle of shooting stage,and from the median branches of crown with 2-year age bamboo trees.In order to represent the nutrient content of plants,5 single bamboos,at least,were needed to be collected for a mean sample.2.Critical value standards were affected by the structure of standing bamboos.As standing bamboos had more than 250 culms per mu (1/15 ha),N,P critical values were respectively 2.6% and 0.13%; optimum values were 2.8% and 0.16%.With sparse standing bamboo trees,or of which top parts of crown were cut off,N critical and optimum values appeared to be a little high up to 2.9% and 3.1%.The output responses of new culms,accumulating in 3 years,agreed with N,P concentration levels.3.DRIS reference values were obtained from the high-yield population of fertilizer experiments (yield 3500kg per mu).DRIS method was evaluated utilizing 4 data sets of N,P,K,Si.In general,where the critical value method made a diagnosis,it agreed with DRIS.DRIS had advantage over the critical value method to assess the status of nutrient balance of plant and nutrient order of requirement.But incorrect diagnoses might occur as nutrients were relative insufficencies or excesses.Considering the variety of forest sites,both the above methods should be recommended together for nutrient diagnoses in bamboo forests.
1989, 2(1): 25-33.
Abstract:
The decomposition process of fallen leaves of the semi-deciduous monsoon forest and the mountain rain forest had been studied with net bags and covers made by nylon threads at Jianfengling,Hainan Island.Through two-year observation,decomposed loss rates of the fallen leaves are 92.27%,78.01% and 99.08%,95.41% respectively.The decomposed velocity of fallen leaves using the cover method is faster than that of the bag one,likewise,the decomposed velocity of the semi-deciduous monsoon forest is faster than that of the mountain rain forest.The decomposition rate "K" values is 2.172,1.578 and 1.596,0.836,correspondingly.Full decomposition may need two and six years,respectively.The removal order of the elements on the decomposition process of the semi-deciduous monsoon forest and mountain rain forest fallen leaves are as follows,KCaNaMgNCPAlFeSiKCaMgNaONPAlSiFeThe decomposition of the litter fall which is an important process and way of material cycle and soil nutrients input into the forest ecosystem.This research has an important academic meaning and applying value on the structure,function and management of the tropical forest ecosystem.
The decomposition process of fallen leaves of the semi-deciduous monsoon forest and the mountain rain forest had been studied with net bags and covers made by nylon threads at Jianfengling,Hainan Island.Through two-year observation,decomposed loss rates of the fallen leaves are 92.27%,78.01% and 99.08%,95.41% respectively.The decomposed velocity of fallen leaves using the cover method is faster than that of the bag one,likewise,the decomposed velocity of the semi-deciduous monsoon forest is faster than that of the mountain rain forest.The decomposition rate "K" values is 2.172,1.578 and 1.596,0.836,correspondingly.Full decomposition may need two and six years,respectively.The removal order of the elements on the decomposition process of the semi-deciduous monsoon forest and mountain rain forest fallen leaves are as follows,KCaNaMgNCPAlFeSiKCaMgNaONPAlSiFeThe decomposition of the litter fall which is an important process and way of material cycle and soil nutrients input into the forest ecosystem.This research has an important academic meaning and applying value on the structure,function and management of the tropical forest ecosystem.
1989, 2(1): 34-41.
Abstract:
Based on the improvements of observing methods in 1980-1981,the evapotranspiration experiment in a tropical monsoon forest was conducted using EBBR method on Hainan Island from 1983 to 1985 during which 49 sampled days in dry seasons and rainy seasons were selected at random.A stepwise multiple regression was set up using the daily evapotranspiration values and the synoptic data which were recorded daily from a meteorological station 1 km away from the Research Station of Tropical Forestry.The rainfall was taken into consideration in the regession equations by using especially designed index "Available Water for Evaporation" (AWE).As comparison,the every day EPT values were calculated using Penman-Monteith equation.The computed results turned to be 534.7mm,520.7mm and 564.0 mm according to EBBR method; and 721.1 mm,714.8 and 728.4 mm according to Penman-Monteith equation for 1983,1984 and 1985 respectively.The EPT/rainfall ratios were 30.4% 30.2% and 44.9% with EBBR method; and 41.0%,41.5% and 58.0% with Penman-Moneith equation for 1983,1984 and 1985 respectively.The ratios were strongly correlated with intensities of rainfall.The larger the intensities of rainfall,the smaller the rater consumption percent (EPT/rainfall) because of the greater runoff.The minimun average daily EPT values were 0.36 mm/d and 0.49mm/d by the two methods respectively; and the corresponding maximum average daily EPT values were 2.55mm/d and 3.14mm/d respectively.
Based on the improvements of observing methods in 1980-1981,the evapotranspiration experiment in a tropical monsoon forest was conducted using EBBR method on Hainan Island from 1983 to 1985 during which 49 sampled days in dry seasons and rainy seasons were selected at random.A stepwise multiple regression was set up using the daily evapotranspiration values and the synoptic data which were recorded daily from a meteorological station 1 km away from the Research Station of Tropical Forestry.The rainfall was taken into consideration in the regession equations by using especially designed index "Available Water for Evaporation" (AWE).As comparison,the every day EPT values were calculated using Penman-Monteith equation.The computed results turned to be 534.7mm,520.7mm and 564.0 mm according to EBBR method; and 721.1 mm,714.8 and 728.4 mm according to Penman-Monteith equation for 1983,1984 and 1985 respectively.The EPT/rainfall ratios were 30.4% 30.2% and 44.9% with EBBR method; and 41.0%,41.5% and 58.0% with Penman-Moneith equation for 1983,1984 and 1985 respectively.The ratios were strongly correlated with intensities of rainfall.The larger the intensities of rainfall,the smaller the rater consumption percent (EPT/rainfall) because of the greater runoff.The minimun average daily EPT values were 0.36 mm/d and 0.49mm/d by the two methods respectively; and the corresponding maximum average daily EPT values were 2.55mm/d and 3.14mm/d respectively.
1989, 2(1): 42-46.
Abstract:
The mite,Allotrombium sp.is a predator of the tingid,Hegesidemus habrus.It has one generation a year in Beijing and Lin Yi area,Shangdong province.It overwinters in the adult stage and eggs are laid in the soil in the following spring.Both the nymph and adult of this mite.can prey on the tingid nymph.The population of the tingid could be controlled by the mite.It is found that the cabbage aphid,Brevicoryne brassicae can be used as food for the mite.The peroid of the mite's life cycle can be shortened,if the mite is reared with this aphid.Releases were made according to the predator:pest ratio as 1:50.The population of the tingid could be reduced by 76.01%.The effect of mass-releasing of this mite in young stands is quite promising.Generally,its colony is easy to be established.
The mite,Allotrombium sp.is a predator of the tingid,Hegesidemus habrus.It has one generation a year in Beijing and Lin Yi area,Shangdong province.It overwinters in the adult stage and eggs are laid in the soil in the following spring.Both the nymph and adult of this mite.can prey on the tingid nymph.The population of the tingid could be controlled by the mite.It is found that the cabbage aphid,Brevicoryne brassicae can be used as food for the mite.The peroid of the mite's life cycle can be shortened,if the mite is reared with this aphid.Releases were made according to the predator:pest ratio as 1:50.The population of the tingid could be reduced by 76.01%.The effect of mass-releasing of this mite in young stands is quite promising.Generally,its colony is easy to be established.
1989, 2(1): 47-54.
Abstract:
The dieback of Cedar,Cedrus deodara (Roxb.) Lond,was first found in May 1986 in Hangzhou,Fuyang and Linan,Zhejiang province.It caused the death of needles in bunch and tender spring shoots in great quantity.The results of investigation on 11 standard plots showed an average incidence of 82.2% (31.8-100.0%) and disease index of 27.0 (7.9-52.2).The pathogen has been examined through Koch's postulates and identified as Botrytis latebricola Jaap.,a fungus thus with new record in China.The temperature and relative humidity range for spore germination of the pathogen are 10-30℃ and90% respectively with the optimum temperature between 20-25℃.The pH value for spore germination is 3-10 with the optimum of 4-5.The disease control effect reached 35.0-46.7% when sprayed 0.14% wet table thiophanate methyl suspension 2-3 times in May.
The dieback of Cedar,Cedrus deodara (Roxb.) Lond,was first found in May 1986 in Hangzhou,Fuyang and Linan,Zhejiang province.It caused the death of needles in bunch and tender spring shoots in great quantity.The results of investigation on 11 standard plots showed an average incidence of 82.2% (31.8-100.0%) and disease index of 27.0 (7.9-52.2).The pathogen has been examined through Koch's postulates and identified as Botrytis latebricola Jaap.,a fungus thus with new record in China.The temperature and relative humidity range for spore germination of the pathogen are 10-30℃ and90% respectively with the optimum temperature between 20-25℃.The pH value for spore germination is 3-10 with the optimum of 4-5.The disease control effect reached 35.0-46.7% when sprayed 0.14% wet table thiophanate methyl suspension 2-3 times in May.
1989, 2(1): 55-58.
Abstract:
The paper deals with the blocking effect of Phyllanthus emblica L.on the formation of N-nitroso-compound in human body.Ohshima's method was used to measure the quantity of N-nitroso-proline (NPRO) in urine as an index.Each one of the twelve tested men absorbed 500 mgL- proline and 300 mg sodium nitrate,after that,the average quantity of N-nitroso-proline in their urine was 75.10nmol.However,when absorbing L-proline and sodium nitrate,they absorbed again ascorbic acid and Phyllanthus emblica L.juice of the same concentration with ascorbic acid separately.The content of NPRO in their urine was down to 41.08nmol and 20.79nmol respectively.The content of NPRO of the latter is lower than background number (25.55 nmol).It indicated that if a man absorbed 13ml Phyllanthus emblica L.juice containing 75 mg ascorbic acid in this experiment,the synthesis of NPRO,which was formed by absorbing 500 mgL- proline and 300 mg sodium nitrate in human body could be blocked.Besides,it also showed that the Phyllanthus emblica juice could block the synthesis of N-nitroso-compound in human body effectively.
The paper deals with the blocking effect of Phyllanthus emblica L.on the formation of N-nitroso-compound in human body.Ohshima's method was used to measure the quantity of N-nitroso-proline (NPRO) in urine as an index.Each one of the twelve tested men absorbed 500 mgL- proline and 300 mg sodium nitrate,after that,the average quantity of N-nitroso-proline in their urine was 75.10nmol.However,when absorbing L-proline and sodium nitrate,they absorbed again ascorbic acid and Phyllanthus emblica L.juice of the same concentration with ascorbic acid separately.The content of NPRO in their urine was down to 41.08nmol and 20.79nmol respectively.The content of NPRO of the latter is lower than background number (25.55 nmol).It indicated that if a man absorbed 13ml Phyllanthus emblica L.juice containing 75 mg ascorbic acid in this experiment,the synthesis of NPRO,which was formed by absorbing 500 mgL- proline and 300 mg sodium nitrate in human body could be blocked.Besides,it also showed that the Phyllanthus emblica juice could block the synthesis of N-nitroso-compound in human body effectively.
1989, 2(1): 59-66.
Abstract:
The aim of the study was to investigate the variation pattern in seed properties of seed orchards of Chinese fir.Seed samples were taken from 70 seed orchards established at different locations throughout its natural range.The three properties,namely germination rate,percentage of death seed and absolute seed weight,were assessed during 1981-1983,and 1986.The results showed that referring to properties studied,year-to-year and orchard-to-orchard variations were exhibited.The seed weight often decreases with the decrease of longitude,where the seedlots came from.The variation of the other two properties showed the ecotypical (or regional) patterns,no clinal ones.The variation pattern of germination rate closely paralleled the pattern of death seed,bul there was negative relation between these two variables.This finding has been made to help the tree breeders know where the optimum regions are to establish seed orchard of Chinese fir.
The aim of the study was to investigate the variation pattern in seed properties of seed orchards of Chinese fir.Seed samples were taken from 70 seed orchards established at different locations throughout its natural range.The three properties,namely germination rate,percentage of death seed and absolute seed weight,were assessed during 1981-1983,and 1986.The results showed that referring to properties studied,year-to-year and orchard-to-orchard variations were exhibited.The seed weight often decreases with the decrease of longitude,where the seedlots came from.The variation of the other two properties showed the ecotypical (or regional) patterns,no clinal ones.The variation pattern of germination rate closely paralleled the pattern of death seed,bul there was negative relation between these two variables.This finding has been made to help the tree breeders know where the optimum regions are to establish seed orchard of Chinese fir.
1989, 2(1): 67-70.
Abstract:
13 species of bamboo pollen which belong to 4 genera were measured,the range of diameter is between 35.0-79.8μm.The diameters of the 6 species of bamboo pollen which belong to Phyllostachys are over 50 μm; these spores are of large size.Most of the bamboo pollen of Pleioblastus,Pseudosasa and Indosasa are of middle size spores with the diameters between 25-50 μmn.It was showed by electron microscope scanning that the shape of bamboo pollens is subsphaeroidal,each of the bamboo pollens has an approximate round germinal aperture with ring,the veins of the spore wall are granular or wart like,there are little differences between species.The germination percentage of the bamboo pollens in 5% sugar solution are 53.4% the most,2% the least.Sugar solution is the suitable culture solution.
13 species of bamboo pollen which belong to 4 genera were measured,the range of diameter is between 35.0-79.8μm.The diameters of the 6 species of bamboo pollen which belong to Phyllostachys are over 50 μm; these spores are of large size.Most of the bamboo pollen of Pleioblastus,Pseudosasa and Indosasa are of middle size spores with the diameters between 25-50 μmn.It was showed by electron microscope scanning that the shape of bamboo pollens is subsphaeroidal,each of the bamboo pollens has an approximate round germinal aperture with ring,the veins of the spore wall are granular or wart like,there are little differences between species.The germination percentage of the bamboo pollens in 5% sugar solution are 53.4% the most,2% the least.Sugar solution is the suitable culture solution.
1989, 2(1): 70-83.
Abstract:
Practical measurement of 6383 collected poplar cores from all of the poplar cultural areas in China has been conducted.After analysis of breast-height form-factor of various poplar stocks,the author divided them into 12 tree species groups.After the calculation of volume variation coefficient of each poplar tree species group,according to the equation n=t2C2/E2 the author analysed the required number of cores necessary for the establishment of volume tables and tried to establish them with 5 regression equations,then applying the residual standard deviation,coefficient of correlation and systemic deviation to test them and select the most suitable equation to establish the binomial stock volume table of Populus tomentosa,P.× canadensis,P.beijingensis,P.nigra,I-72/58,I-69/55,I-63/51,P.×euramericana Guinier cv."Sacrau",P.× euramericana Guinier cv."Robusta",P.taiging,P.×xiaozhuanica,P.purdomii,P.alba and P.alba var.pyramidalis.These tables have widely been used with good results.
Practical measurement of 6383 collected poplar cores from all of the poplar cultural areas in China has been conducted.After analysis of breast-height form-factor of various poplar stocks,the author divided them into 12 tree species groups.After the calculation of volume variation coefficient of each poplar tree species group,according to the equation n=t2C2/E2 the author analysed the required number of cores necessary for the establishment of volume tables and tried to establish them with 5 regression equations,then applying the residual standard deviation,coefficient of correlation and systemic deviation to test them and select the most suitable equation to establish the binomial stock volume table of Populus tomentosa,P.× canadensis,P.beijingensis,P.nigra,I-72/58,I-69/55,I-63/51,P.×euramericana Guinier cv."Sacrau",P.× euramericana Guinier cv."Robusta",P.taiging,P.×xiaozhuanica,P.purdomii,P.alba and P.alba var.pyramidalis.These tables have widely been used with good results.
1989, 2(1): 71-77.
Abstract:
Using the data of field experiment,a mathematical model of orientation and the wind reduction effect of the shelterbelt lattice was obtained.The preliminary conclusion is as follows:1.The vector composition method is suitable to the study;2.Under the same conditions,for a shelterbelt square,the wind reduction effect is not related to wind inclination;3.Under the same conditions,for a shelterbelt rectangle,if the prevalent wind is from the short side of the rectangle,the wind reduction effect will increase as the wind inclination angle become larger.
Using the data of field experiment,a mathematical model of orientation and the wind reduction effect of the shelterbelt lattice was obtained.The preliminary conclusion is as follows:1.The vector composition method is suitable to the study;2.Under the same conditions,for a shelterbelt square,the wind reduction effect is not related to wind inclination;3.Under the same conditions,for a shelterbelt rectangle,if the prevalent wind is from the short side of the rectangle,the wind reduction effect will increase as the wind inclination angle become larger.
1989, 2(1): 84-87.
Abstract:
Alnus cremastogyne is a fast growing timber tree species with much utilization.It originated in Sichuan and has been cultivated for 1000 years.So far it has been introduced to Zhejiang,Anhui and Jiangxi Provinces.Authors tested 75 copies of excellent single-tree seed and 5 copies of mixture seed from 6 counties in Sichuan and Zhejiang.The result indicated that the 1000-seed weight is 0.474 g in average and it varied from 0.15g to0.79g.The difference is obvious among different seed sources-percentageof germination was 2-83%,43.7% in average at 25℃ room temperature.Besides,the percentage of germination was also correlated with altitude,the side of slope,especially tree age.When we want to determine the time for seed collection,we must consider the method for seed collection and the environment of seed sources.
Alnus cremastogyne is a fast growing timber tree species with much utilization.It originated in Sichuan and has been cultivated for 1000 years.So far it has been introduced to Zhejiang,Anhui and Jiangxi Provinces.Authors tested 75 copies of excellent single-tree seed and 5 copies of mixture seed from 6 counties in Sichuan and Zhejiang.The result indicated that the 1000-seed weight is 0.474 g in average and it varied from 0.15g to0.79g.The difference is obvious among different seed sources-percentageof germination was 2-83%,43.7% in average at 25℃ room temperature.Besides,the percentage of germination was also correlated with altitude,the side of slope,especially tree age.When we want to determine the time for seed collection,we must consider the method for seed collection and the environment of seed sources.
1989, 2(1): 88-92.
Abstract:
Nitrate reductase activity (NRA),chlorophyll,protein,free amino acid and nitrate contents of different clones of Cunniughamia lanceclata were determined in relation to nitrogen fertilizer.Nitrogen was supplied as NH4NO3.There were differences of (NRA) between the fast growing and slow growing clone seedlings.The former exhibited higher NRA.They were 8-10 μmol NO2-/30 min/g fresh weight but the latter was 6.2 μmol NO2/30 min/g fresh weight.NRA in seedling leaves increased with the increase of nitrogen fertilizer.While the concentration of nitrogen fertilizer was higher than 350 mgN/L,NRA decreased.But NRA in fast growing clone seedlings were higher than those in slow growing clone seedlings.They had NRA values of 10-12 and about 7.1 μmol NO2-/30 min/g fresh weight,respectively.
Nitrate reductase activity (NRA),chlorophyll,protein,free amino acid and nitrate contents of different clones of Cunniughamia lanceclata were determined in relation to nitrogen fertilizer.Nitrogen was supplied as NH4NO3.There were differences of (NRA) between the fast growing and slow growing clone seedlings.The former exhibited higher NRA.They were 8-10 μmol NO2-/30 min/g fresh weight but the latter was 6.2 μmol NO2/30 min/g fresh weight.NRA in seedling leaves increased with the increase of nitrogen fertilizer.While the concentration of nitrogen fertilizer was higher than 350 mgN/L,NRA decreased.But NRA in fast growing clone seedlings were higher than those in slow growing clone seedlings.They had NRA values of 10-12 and about 7.1 μmol NO2-/30 min/g fresh weight,respectively.
1989, 2(1): 93-97.
Abstract:
Biological control of poplar diseases is a preliminary study in China.The results of trials were as follows: the control effects of Pseudomonas fluoracens,Bacillus subtilis,B.pumilus and Streptomyces griseus against Cytospora chrysosperma and Gloesporium tremulae were promising.The control effects of Trichoderma sp.(42),T.viride and T.sp.(11) against Dothiorella gregaria and C.chrysosperma were promising,too.The control effects of B.subtilis,B.pumilus,Pseudomonas sp.(M),T.sp.(42),T.viride,T.sp.(11) against Marssonina brunnea were no striker.
Biological control of poplar diseases is a preliminary study in China.The results of trials were as follows: the control effects of Pseudomonas fluoracens,Bacillus subtilis,B.pumilus and Streptomyces griseus against Cytospora chrysosperma and Gloesporium tremulae were promising.The control effects of Trichoderma sp.(42),T.viride and T.sp.(11) against Dothiorella gregaria and C.chrysosperma were promising,too.The control effects of B.subtilis,B.pumilus,Pseudomonas sp.(M),T.sp.(42),T.viride,T.sp.(11) against Marssonina brunnea were no striker.
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