1991 Vol. 4, No. 2
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1991, 4(2): 113-121.
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Abstract:
The felling age of Chinese fir plantation was systematically studied in Daganshan Area. Richards function was selected as the basic growth model of Chinese fir plantation, and site index was introduced into chis model to establish a polymorphic growth model with 7 parameters, using the site index and tree age as the varibles. The quantitative maturity was calculated based on the principle of growth and yield compatibility, and stand structure model on Weibull function, technical maturity on the cultivated timber assortment, acceptable return on investiment was calculated by the readjusted timber shadow price. By means of discounted measure, economic analysis was analysed and economic maturity was determined by the maximum net present value. Two alternative felling age models were proposed on the basis of technical maturity with a emphatical considering of economic maturity and an approprite considering of quantitative maturity. The model has a notable economic return. Comparing the felling age determined by our models with the current felling age, the internal rate of return can be raised and the maximum profit rate can be increased by over 8%.
The felling age of Chinese fir plantation was systematically studied in Daganshan Area. Richards function was selected as the basic growth model of Chinese fir plantation, and site index was introduced into chis model to establish a polymorphic growth model with 7 parameters, using the site index and tree age as the varibles. The quantitative maturity was calculated based on the principle of growth and yield compatibility, and stand structure model on Weibull function, technical maturity on the cultivated timber assortment, acceptable return on investiment was calculated by the readjusted timber shadow price. By means of discounted measure, economic analysis was analysed and economic maturity was determined by the maximum net present value. Two alternative felling age models were proposed on the basis of technical maturity with a emphatical considering of economic maturity and an approprite considering of quantitative maturity. The model has a notable economic return. Comparing the felling age determined by our models with the current felling age, the internal rate of return can be raised and the maximum profit rate can be increased by over 8%.
1991, 4(2): 122-127.
Abstract:
In this paper, the correlability between measurement of tree height in the lab. and in the field was explored by combining the plots of the aerial photo with a scale of 1:2200 with the field plots. The result shows that the correlation coefficient has reached over 0.8, so the measurement of tree height in the field can be replaced by the measurement in lab. instrument to measure the tree height in lab. to estimate the growing stock of the whole bureau, the accuracy was 81.84%. However, we conducted a combining estimation of the growing stock of the whole bureau by using the plot stock measured in lab. and the last plot stock in the field. The accuracy was 85.81%.In order to reduce the field work and make full use of the previous material, a beneficial approach was conducted.This is another useful method for carrying out forest management inventory or forest operational inventory.
In this paper, the correlability between measurement of tree height in the lab. and in the field was explored by combining the plots of the aerial photo with a scale of 1:2200 with the field plots. The result shows that the correlation coefficient has reached over 0.8, so the measurement of tree height in the field can be replaced by the measurement in lab. instrument to measure the tree height in lab. to estimate the growing stock of the whole bureau, the accuracy was 81.84%. However, we conducted a combining estimation of the growing stock of the whole bureau by using the plot stock measured in lab. and the last plot stock in the field. The accuracy was 85.81%.In order to reduce the field work and make full use of the previous material, a beneficial approach was conducted.This is another useful method for carrying out forest management inventory or forest operational inventory.
1991, 4(2): 128-132.
Abstract:
The volume loss caused by larch leaf cast can be expressed by the equation: Y=9.8/(1+e7.3459-0.1x). The control threshold can be determined by the equation:9.8C[1/(1+e7.3459-0.1x)-1/(1+e7.3459-0.1(1-Q)x)]-E=0 Therefore, the control threshold was settled at 46 of disease index in terms of current control technique and economic standard. The volume loss can be neglected when the disease index was below 26, according to the volume loss equation. The developmental threshold was fixed at 26 of disease index based on the relative error margin analysis.
The volume loss caused by larch leaf cast can be expressed by the equation: Y=9.8/(1+e7.3459-0.1x). The control threshold can be determined by the equation:9.8C[1/(1+e7.3459-0.1x)-1/(1+e7.3459-0.1(1-Q)x)]-E=0 Therefore, the control threshold was settled at 46 of disease index in terms of current control technique and economic standard. The volume loss can be neglected when the disease index was below 26, according to the volume loss equation. The developmental threshold was fixed at 26 of disease index based on the relative error margin analysis.
1991, 4(2): 133-138.
Abstract:
This paper reports the chemical constituents of essential oil from the fresh and stored fruits of Hippophae neurocarpa S. W. Liu by applying GC/MS/DS, GC/IR/DS. The contents in the essential oil from the fresh fruits have been determined too. A lot of constituents of essential oil in the fresh and stored fruits are different. Many terpenoids and compounds containing sulfide are discovered. They are dimethylsulfide, dimethyltrisulfide, 2,4-dimethyl-1,3-dioxane, limonene, terpine, ocimene, terpinenol, linalool, elemene, more than twenty compounds.
This paper reports the chemical constituents of essential oil from the fresh and stored fruits of Hippophae neurocarpa S. W. Liu by applying GC/MS/DS, GC/IR/DS. The contents in the essential oil from the fresh fruits have been determined too. A lot of constituents of essential oil in the fresh and stored fruits are different. Many terpenoids and compounds containing sulfide are discovered. They are dimethylsulfide, dimethyltrisulfide, 2,4-dimethyl-1,3-dioxane, limonene, terpine, ocimene, terpinenol, linalool, elemene, more than twenty compounds.
1991, 4(2): 139-146.
Abstract:
This paper describes the distribution characteristics of teak germplasm in China and their genetic variation. A strategy and the way for teak improvement are also put forward in this paper.Teak has been cultivated in China for more than 100 years. The genetic resources distributed in 46 counties/cities of 7 southern provinces. The growth appearance is very close to that in the natural distribution areas of India, Burma and other countries. Satisfactory results on teak improvement have been obtained since we started systematic teak breeding and improvement programme in China. The benefits from both the provenance selection and the clones of superior provenances overpassed the estimation of the original improvement plan. A strategy and the way for teak improvement were worked out according to the past improvement experiences, the characteristics of China's teak germplasmic distribution, and other related situations.
This paper describes the distribution characteristics of teak germplasm in China and their genetic variation. A strategy and the way for teak improvement are also put forward in this paper.Teak has been cultivated in China for more than 100 years. The genetic resources distributed in 46 counties/cities of 7 southern provinces. The growth appearance is very close to that in the natural distribution areas of India, Burma and other countries. Satisfactory results on teak improvement have been obtained since we started systematic teak breeding and improvement programme in China. The benefits from both the provenance selection and the clones of superior provenances overpassed the estimation of the original improvement plan. A strategy and the way for teak improvement were worked out according to the past improvement experiences, the characteristics of China's teak germplasmic distribution, and other related situations.
1991, 4(2): 147-152.
Abstract:
The embryo of imbibitional seed, the apex of 10~12- or 20-day-old seedling (which included cotyledons, shoot apex and 2~3mm hyp-ocotyl stub) were used as explants to induce the adventitious buds. The result showed that the percentage of the induced adventitious buds of the 3 explants were 31.4%, 80% and 0 respectively. The proliferation of adventitious bud was firstly depend on the developmental stage of the explant, and secondly on the concentration of N6-benzyl adenine (BA). The optimum concentration of BA for the induction of adventitious bud was 2.0mg/L. The elongated shoots were incubated in 1/2 Murashige and Skoog (MS) medium supplemented with 1.0~2.0mg/L IBA to inducee rooting, 80% of the shoots were rooted. The residual bases of the shoots were transferred to MS medium in the presence of 1.0~2.0mg/L BA, and 3~5 adventitious buds were regenerated in each base.
The embryo of imbibitional seed, the apex of 10~12- or 20-day-old seedling (which included cotyledons, shoot apex and 2~3mm hyp-ocotyl stub) were used as explants to induce the adventitious buds. The result showed that the percentage of the induced adventitious buds of the 3 explants were 31.4%, 80% and 0 respectively. The proliferation of adventitious bud was firstly depend on the developmental stage of the explant, and secondly on the concentration of N6-benzyl adenine (BA). The optimum concentration of BA for the induction of adventitious bud was 2.0mg/L. The elongated shoots were incubated in 1/2 Murashige and Skoog (MS) medium supplemented with 1.0~2.0mg/L IBA to inducee rooting, 80% of the shoots were rooted. The residual bases of the shoots were transferred to MS medium in the presence of 1.0~2.0mg/L BA, and 3~5 adventitious buds were regenerated in each base.
1991, 4(2): 153-159.
Abstract:
In this paper, the adaptive ability of five major mangrove plants grown in Qinglan Harbour, Hainan Province are analysed comprehensively by grey clustering analysis method through measuring their relative indexes of adaptive organs. It has been pointed out that the distribution positions of these five species are closely related with their ability and expounded that inundated height of mangrove plants is an important factor which impels them to produce and develop their adaptive organs to the oxygen deficiency.
In this paper, the adaptive ability of five major mangrove plants grown in Qinglan Harbour, Hainan Province are analysed comprehensively by grey clustering analysis method through measuring their relative indexes of adaptive organs. It has been pointed out that the distribution positions of these five species are closely related with their ability and expounded that inundated height of mangrove plants is an important factor which impels them to produce and develop their adaptive organs to the oxygen deficiency.
1991, 4(2): 160-166.
Abstract:
Investigations conducted in the recent 10 years have showed that the major varieties or forms, as well as most of the open-pollination progenies from blight-disease-resistant parent individuals of Aleurites fordii were not tolerant to the blight disease infected by Fusarium oxysporum f. sp. aleuritidis. However, trees of the first generation from self-pollination of the resistant individual R44(6) and from crossbreeding of R44(6)×R53(9) were found to possess an evident resistance to the disease. The early effective examination of the disease resistance was conducted by inoculation through application of the fungus suspension to wounded roots at the young seedling stage. It was also found that the content of amino acid in resistant trees was significantly higher than that in the susceptive ones, but lower than that in A. montana trees, which are immune from the wilt disease.
Investigations conducted in the recent 10 years have showed that the major varieties or forms, as well as most of the open-pollination progenies from blight-disease-resistant parent individuals of Aleurites fordii were not tolerant to the blight disease infected by Fusarium oxysporum f. sp. aleuritidis. However, trees of the first generation from self-pollination of the resistant individual R44(6) and from crossbreeding of R44(6)×R53(9) were found to possess an evident resistance to the disease. The early effective examination of the disease resistance was conducted by inoculation through application of the fungus suspension to wounded roots at the young seedling stage. It was also found that the content of amino acid in resistant trees was significantly higher than that in the susceptive ones, but lower than that in A. montana trees, which are immune from the wilt disease.
1991, 4(2): 167-171.
Abstract:
Cryptothelea variegata Snellen harms leaves of Paulownia fortune: during the larval stage, the area nibbled is 248.28cm2/one larva. That the nibbled area of leaves makes up 25 per cent of the total leaves on each tree has been determined as the index of control. As for old tree, the index of control was 4 larvae/ten pieces leaves. The relation between total leaves on each tree (y:cm2) and diameter breast-high (x:cm) is: y=10987.5281x1.2647.
Cryptothelea variegata Snellen harms leaves of Paulownia fortune: during the larval stage, the area nibbled is 248.28cm2/one larva. That the nibbled area of leaves makes up 25 per cent of the total leaves on each tree has been determined as the index of control. As for old tree, the index of control was 4 larvae/ten pieces leaves. The relation between total leaves on each tree (y:cm2) and diameter breast-high (x:cm) is: y=10987.5281x1.2647.
1991, 4(2): 172-177.
Abstract:
The paper analysed the growth of Eucalyptus urbphylla young plantation involving seven provenances of 4-year-old. The result showed that there were significant differences or extreme significant differences among provenances. The best provenances at the age of 4 years old are No. 12895 and No. 14532 with a mean height of 12.94m and 13.01m respectively, and a mean DBH of 11.62 cm and 11.34cm respectively. The worst provenance is No. 10140 with a mean height of 6.71m and mean DBH of 5.96cm. Besides, There are significant differences of wind resistance and other properties existing among the 7 provenances.
The paper analysed the growth of Eucalyptus urbphylla young plantation involving seven provenances of 4-year-old. The result showed that there were significant differences or extreme significant differences among provenances. The best provenances at the age of 4 years old are No. 12895 and No. 14532 with a mean height of 12.94m and 13.01m respectively, and a mean DBH of 11.62 cm and 11.34cm respectively. The worst provenance is No. 10140 with a mean height of 6.71m and mean DBH of 5.96cm. Besides, There are significant differences of wind resistance and other properties existing among the 7 provenances.
1991, 4(2): 178-184.
Abstract:
The methods for the establishment of the gene pools for the germ plasm resources of Camellia L. and the scientific and economic values shown by the pools were presented. Four gene pools have been established by rapid propagations of grafting on large stocks of C. oleifera. The germ plasm resources collected and preserved have reached 2 267 in quantity, including 161 species, more than 340 varieties of Camellias which are cultivated as ornamental plants, and 1605 farm-varieties, elit trees and clones of oil-tea camellias. Put the species and varieties from different latitudes, elevations and ecological conditions at the same place and conduct some research. In this way, it increased the adaptability and resistance of the germ plasms to the environments,and brought the pools roles into full play.
The methods for the establishment of the gene pools for the germ plasm resources of Camellia L. and the scientific and economic values shown by the pools were presented. Four gene pools have been established by rapid propagations of grafting on large stocks of C. oleifera. The germ plasm resources collected and preserved have reached 2 267 in quantity, including 161 species, more than 340 varieties of Camellias which are cultivated as ornamental plants, and 1605 farm-varieties, elit trees and clones of oil-tea camellias. Put the species and varieties from different latitudes, elevations and ecological conditions at the same place and conduct some research. In this way, it increased the adaptability and resistance of the germ plasms to the environments,and brought the pools roles into full play.
1991, 4(2): 185-191.
Abstract:
Dormancy is one of the characteristics of Acer truncatum seeds. During the dormant period, pericarp and seed coat played an important and manifold role. Before the state of dormancy was over, the undamaged perfect seeds had to be kept under a condition of low temperature (2-5℃), and a stratification for 40~50 days. Under the condition of 25℃, the seeds after removing mulch could germinate without pre-treatment. Seed mulch has inhibitiry effect on oxygen absorption of seed embryo and limits the swelling of embryo physically and mechanically, and hinders the spread of inhitor to seed germination. During the process of stratification treatment, with the continuous increase of nutritive substance in embryo, the resistance of seeds to inhibitors increased uninterruptedly. Eventually the seeds overcame the inhibition form outer tissue and germinated.
Dormancy is one of the characteristics of Acer truncatum seeds. During the dormant period, pericarp and seed coat played an important and manifold role. Before the state of dormancy was over, the undamaged perfect seeds had to be kept under a condition of low temperature (2-5℃), and a stratification for 40~50 days. Under the condition of 25℃, the seeds after removing mulch could germinate without pre-treatment. Seed mulch has inhibitiry effect on oxygen absorption of seed embryo and limits the swelling of embryo physically and mechanically, and hinders the spread of inhitor to seed germination. During the process of stratification treatment, with the continuous increase of nutritive substance in embryo, the resistance of seeds to inhibitors increased uninterruptedly. Eventually the seeds overcame the inhibition form outer tissue and germinated.
1991, 4(2): 192-196.
Abstract:
The monograph of the geographic distribution of the white wax scale has not been reported before. In the years 1980 to 1988, investigation on the white wax scale has been conducted. The investigation indicated that the white wax scale's distribution is from 85°08' to 121°23'E and 18° to 42° N; with an elevation of 4.7m to 3000m in vertical distribution; from the warm temperate zone to north temperate zone and from north subtropical zone to the south subtropical zone. The adaptibility of the white wax scale to different climatic environments and ecological conditions was quite strong and its plasticity quite big. The distribution of its natural enemies is basically the same as that of the white wax scale.
The monograph of the geographic distribution of the white wax scale has not been reported before. In the years 1980 to 1988, investigation on the white wax scale has been conducted. The investigation indicated that the white wax scale's distribution is from 85°08' to 121°23'E and 18° to 42° N; with an elevation of 4.7m to 3000m in vertical distribution; from the warm temperate zone to north temperate zone and from north subtropical zone to the south subtropical zone. The adaptibility of the white wax scale to different climatic environments and ecological conditions was quite strong and its plasticity quite big. The distribution of its natural enemies is basically the same as that of the white wax scale.
1991, 4(2): 197-200.
Abstract:
Hishimonus sellatus Uhler is one of the major vectors of jujube witche's broom disease. The author studied it's migration and control measures from 1986 to 1989. This pest has four generations per year in the west mountains of Shijiazhuang, Hebei Province., Most adults of the 4th generation migrate directly from jujube to pine (Pinus tabulaeformis Carr.) or orborvitae (Platycladus orientalis Franco) nearby from the middle of September to October every year to overwinter there. After winter, the surviving images begin to migrate to the white mulberry (Moras alba L.) and common papermlberry (Broussonetia papyrifera Vent) on about 20th April next year, and they reproduce one generation there. Then, they migrate to jujube and reproduce three generations from the end of May to the beginning of June. Experiments show that Meothrin is remarkbly effective for controlling this pest.
Hishimonus sellatus Uhler is one of the major vectors of jujube witche's broom disease. The author studied it's migration and control measures from 1986 to 1989. This pest has four generations per year in the west mountains of Shijiazhuang, Hebei Province., Most adults of the 4th generation migrate directly from jujube to pine (Pinus tabulaeformis Carr.) or orborvitae (Platycladus orientalis Franco) nearby from the middle of September to October every year to overwinter there. After winter, the surviving images begin to migrate to the white mulberry (Moras alba L.) and common papermlberry (Broussonetia papyrifera Vent) on about 20th April next year, and they reproduce one generation there. Then, they migrate to jujube and reproduce three generations from the end of May to the beginning of June. Experiments show that Meothrin is remarkbly effective for controlling this pest.
1991, 4(2): 201-206.
Abstract:
3 cultivars of Populus deltoides Marsh and 4 cultivars of P. x euramericana (Dode) Guinier are used as male and/or female parents to carry out 7 species and/or cultivars combinations of hybridizatios in this test. The F1 hybrids of these combinations have been studied for 8 years (1982~1990) and 3 combinations among them have been selected as good combinations which are Populus deltoides cv. 'LUX' × p. deltoides cv. 'Shan Hai Guan', P. deltoides cv. 'Shan Hai Guan' × P. deltoides cv.'Harvard' and P. x euramericana cv. 'San Martino'× P. deltoides cv.'Shan Hai Guan'. At age 4, the hybrids of these 3 combinations exceeded P. x euramericana cv. Sacran 79 (control) in height by 23%~37.5% and in breast high diameter by 26.5%~81.5% and expressed obvious hybrid vigor. The F1 hybrids of P. deltoides cv. × p. deltoides cv. differentiate a fewer morphological forms and their growth rate is higher than that of their parents and control. From these hybrids we have obtained some new clones which possess such characteristics as high quality and fast growth. The F1 hybrids of P. x euramericana cv. × P. x euramericana cv. differentiate more morphological forms which grow relatively slowly. The transgressive inheritance in growth rate of these hybrids is less or negative and it is impossible to choose any clone surppassing control in growth rate from them. The F1 hybrids of P. deltoides cv. × P. x euramericana cv. are the intermediate forms of the above mentioned F, hybrids. Since the growth rate of these hybrids is relatively high, it is possible to choose some ideal clones from them.
3 cultivars of Populus deltoides Marsh and 4 cultivars of P. x euramericana (Dode) Guinier are used as male and/or female parents to carry out 7 species and/or cultivars combinations of hybridizatios in this test. The F1 hybrids of these combinations have been studied for 8 years (1982~1990) and 3 combinations among them have been selected as good combinations which are Populus deltoides cv. 'LUX' × p. deltoides cv. 'Shan Hai Guan', P. deltoides cv. 'Shan Hai Guan' × P. deltoides cv.'Harvard' and P. x euramericana cv. 'San Martino'× P. deltoides cv.'Shan Hai Guan'. At age 4, the hybrids of these 3 combinations exceeded P. x euramericana cv. Sacran 79 (control) in height by 23%~37.5% and in breast high diameter by 26.5%~81.5% and expressed obvious hybrid vigor. The F1 hybrids of P. deltoides cv. × p. deltoides cv. differentiate a fewer morphological forms and their growth rate is higher than that of their parents and control. From these hybrids we have obtained some new clones which possess such characteristics as high quality and fast growth. The F1 hybrids of P. x euramericana cv. × P. x euramericana cv. differentiate more morphological forms which grow relatively slowly. The transgressive inheritance in growth rate of these hybrids is less or negative and it is impossible to choose any clone surppassing control in growth rate from them. The F1 hybrids of P. deltoides cv. × P. x euramericana cv. are the intermediate forms of the above mentioned F, hybrids. Since the growth rate of these hybrids is relatively high, it is possible to choose some ideal clones from them.
1991, 4(2): 207-210.
Abstract:
This paper detailed the relationship between tree diseases and death of Pinus armandi in the eastern part of Sichuan. Observations showed that the needle cast were induced by light yellow lesion in basal needle, but it did not appear in any fruiting body.In isolate culture, the rate of colony is only 10.2%~13.2%. Results of artificial inoculation test on needle show that pathogenic infection are negative. Sprayed with Bordeaux mixture etc, the yellow lesion also produced on the basal needle.According to the results of above 4 experiments, it might be considered that pathological change of needle basal yellow lesion does not belong to infectious disease.
This paper detailed the relationship between tree diseases and death of Pinus armandi in the eastern part of Sichuan. Observations showed that the needle cast were induced by light yellow lesion in basal needle, but it did not appear in any fruiting body.In isolate culture, the rate of colony is only 10.2%~13.2%. Results of artificial inoculation test on needle show that pathogenic infection are negative. Sprayed with Bordeaux mixture etc, the yellow lesion also produced on the basal needle.According to the results of above 4 experiments, it might be considered that pathological change of needle basal yellow lesion does not belong to infectious disease.
1991, 4(2): 211-216.
Abstract:
The seedling dynamic procedures of growth of some tree species, such as Pinus massoniana, P. elliottii, P. taeda, Camellia oleifera, Aleurites montana,A.fordii have been modeled with grey model and Stype curve model. The results show that there are different dynamic models of growth in the seedling stage of different tree species. GM(1,1) and S type curve models have broad adaptability in modeling growth of trees in seedling stage. There are different results for height growth of different tree species when using GM(1,1) and S type curve models. GM(1,1) model is preferable to S type curve model in the modeling for the thick growth near ground. GM(2,1) and GM(1,N) can been used unwillingly for modeling some tree species. The modeling results by using Verhulst model are the worst of seedling modeling for all tree species with grey model and S type curve model.
The seedling dynamic procedures of growth of some tree species, such as Pinus massoniana, P. elliottii, P. taeda, Camellia oleifera, Aleurites montana,A.fordii have been modeled with grey model and Stype curve model. The results show that there are different dynamic models of growth in the seedling stage of different tree species. GM(1,1) and S type curve models have broad adaptability in modeling growth of trees in seedling stage. There are different results for height growth of different tree species when using GM(1,1) and S type curve models. GM(1,1) model is preferable to S type curve model in the modeling for the thick growth near ground. GM(2,1) and GM(1,N) can been used unwillingly for modeling some tree species. The modeling results by using Verhulst model are the worst of seedling modeling for all tree species with grey model and S type curve model.
1991, 4(2): 217-221.
Abstract:
Parakmeria lotungensis is one of the tree species which have been focally protected by our government. The natural distribution range of this species is 18°44'~29°24' N and 107°50'~119°09' E, that is the northern margin of the tropic to central part of middle subtropic of China, with an elevation of 300~1400m. It is generally mixed with other evergreen broadleaf tree species. The average yearly temperature in the distribution area is 13°~19.9℃ and the absolute low one is -13.3℃. The soil of its forestland is latosolizative yellow earth, mountain red or yellow earth with pH4.6~5.6.It has been introduced to Nanjing of Jiangsu Province, the most northern place up to now which is 32°25' N with an elevation of 30 m. The soil there is yellowish brown earth with pH about 7.5. The young trees grow well.
Parakmeria lotungensis is one of the tree species which have been focally protected by our government. The natural distribution range of this species is 18°44'~29°24' N and 107°50'~119°09' E, that is the northern margin of the tropic to central part of middle subtropic of China, with an elevation of 300~1400m. It is generally mixed with other evergreen broadleaf tree species. The average yearly temperature in the distribution area is 13°~19.9℃ and the absolute low one is -13.3℃. The soil of its forestland is latosolizative yellow earth, mountain red or yellow earth with pH4.6~5.6.It has been introduced to Nanjing of Jiangsu Province, the most northern place up to now which is 32°25' N with an elevation of 30 m. The soil there is yellowish brown earth with pH about 7.5. The young trees grow well.
1991, 4(2): 222-225.
Abstract:
This paper reports the marked differences of infection by Japanese pine bast scale on Masson Pines of thin and thick bark types in Fuyang County, Zhejiang Province. The results showed that the number of both egg sac and nymph were significantly more on thin-bark trees than on thick-bark trees for different provenances of Masson Pine, thus indicating that Masson Pine of thick bark type is, to certain extent, resistant to Japanese pine bast scale.
This paper reports the marked differences of infection by Japanese pine bast scale on Masson Pines of thin and thick bark types in Fuyang County, Zhejiang Province. The results showed that the number of both egg sac and nymph were significantly more on thin-bark trees than on thick-bark trees for different provenances of Masson Pine, thus indicating that Masson Pine of thick bark type is, to certain extent, resistant to Japanese pine bast scale.
1991, 4(2): 226-230.
Abstract:
In this paper,the propagation technique in vitro for the new varieties of Narcissus selected from N. tazetta var. chinensis Rome was reported. In order to conserve germplasm resources of Narcissus and achieve the level of mass production, we conducted a series of synthetical systematic experiments for 3 years. The result showed that the bulbils were induced on twin scales on MS medium containing 0~5 mg/L BA, 0~1 mg/L NAA and a little activated-carbon. The percentage of induction reached 70%. More bulblets could be obtained through subculture in the same medium. If the bulbils were transplanted in 1/2MS medium with 0.1mg/L IBA in shade-culture, the rooting rate could be raised in the dark to 79.3%. If in vitro bulbils were cultivated in the field they might flower after 3 years.
In this paper,the propagation technique in vitro for the new varieties of Narcissus selected from N. tazetta var. chinensis Rome was reported. In order to conserve germplasm resources of Narcissus and achieve the level of mass production, we conducted a series of synthetical systematic experiments for 3 years. The result showed that the bulbils were induced on twin scales on MS medium containing 0~5 mg/L BA, 0~1 mg/L NAA and a little activated-carbon. The percentage of induction reached 70%. More bulblets could be obtained through subculture in the same medium. If the bulbils were transplanted in 1/2MS medium with 0.1mg/L IBA in shade-culture, the rooting rate could be raised in the dark to 79.3%. If in vitro bulbils were cultivated in the field they might flower after 3 years.
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