The minute size of orchid seeds have made them difficult to observe,orchid seeds germination and mortality of seedlings in suit difficult to study.Recently,a new technique was described by which orchid seeds were sowe...The minute size of orchid seeds have made them difficult to observe,orchid seeds germination and mortality of seedlings in suit difficult to study.Recently,a new technique was described by which orchid seeds were sowed and retrieved in the field under natural conditions.It is possible to conduct a quantitative study of orchid germination in suit and observe seasonal growth and mortality of seedlings.The technique has also enabled us to bait appropriate fungus from the germinated seeds and young seedlings,which could be beneficial both to the orchid propagation and conservation.For the further studies,the potential issue and application perspective of this technique are also discussed in this text.展开更多
Study on shooting and growth rhythm of Pseudosasa japonica var. tsutsumiana resulted that shooting period was from March 3 to May 5, and shoot quantity accorded with partial normal distribution.Adult bamboo reached 70...Study on shooting and growth rhythm of Pseudosasa japonica var. tsutsumiana resulted that shooting period was from March 3 to May 5, and shoot quantity accorded with partial normal distribution.Adult bamboo reached 70.19%. The height growth could be divided into initial, ascending, boosting and terminal stage.Daily increment of height growth was 1～2 cm at the initial stage(about 11 d), 2～3 cm at the ascending one(12 d), more than 3 cm at the boosting one(19 d). The maximum was 4.45 cm at boosting stage. By the terminal stage (4 d), the height growth decreased obviously and stopped rapidly at last. Height growth process of young bamboo accorded with the Logistic Equation. But the height growth was influenced by the underground temperature of 10 cm and 15 cm, as well as average daily temperature and the humidity, especially the underground temperature of 10 cm and 15 cm which had positive correlation with the daily increment of height growth.展开更多
The ancient Ginkgo population in Funiu Mountain in the west of Henan Province distributes to the south of the top of Funiu Mountain, where there are old geology, warm climate, superior environment and many kinds of Gi...The ancient Ginkgo population in Funiu Mountain in the west of Henan Province distributes to the south of the top of Funiu Mountain, where there are old geology, warm climate, superior environment and many kinds of Ginkgo from Paleozoic. The local have the intense sense of protecting the old trees and most villages are named as Ginkgo. From then on lots of ancient Ginkgo have still live in few people hillside.The population structure approach to nature and jamming is slight which account for the ancient Ginkgo population in the west of Henan Province maybe the nature multiplication of the ancient Ginkgo.展开更多
Rooting characteristics of forest trees is an important trait both for silviculture and also for genetic improvement,but its progress which was made on its improvement was rather small due to the complexity and heavy ...Rooting characteristics of forest trees is an important trait both for silviculture and also for genetic improvement,but its progress which was made on its improvement was rather small due to the complexity and heavy work for rooting traits measurement.Fractal theory provided a new idea and also a method to deal with such complicated traits.The rooting characteristics based on cuttings of 46 poplar clones were investigated,poplar cuttings were cultivated in two kinds of medium,perlite and fresh water.Pictures were took for each cutting with a digit camera and then edited with Photoshop 6.0,Fractal dimensions were obtained for each picture by the software(FDC1.0).For the two rooting traits(length,dry mass)investigated,there were significant differences existed among clones.The variation ranges of fractal dimension of cuttings were 1.173～1.533 for 46 clones cultivated in perlite,and 1.513～1.814 for 34 clones cultivated in water.A significant positive correlation was found between fractal dimension and dry mass of roots,thus,fractal dimension might be a substitutive index for rooting characteristics.In general,the more the cutting roots,the bigger the fractal dimension.展开更多
In order to reveal the physiological reaction and adaptability of natural Sabina vulgaris community to sandy environment in different successional stages, we determined physiological index of drought_resistance of S.v...In order to reveal the physiological reaction and adaptability of natural Sabina vulgaris community to sandy environment in different successional stages, we determined physiological index of drought_resistance of S.vulgaris under different successional stages by colorimetry in TuKe of Mu Us Sandland. The results showed that with the process of the succession, PRO and MDA contents increase first, and then decrease during the process of the succession. The variance analysis showed that the difference of the PRO contents among stages is more significant. The difference of the SOD and POD activity is more significant among stages, but the CAT activity has no significant change. In the fourth successional stage, the contents of MDA and PRO increase, the activity of SOD and POD increase. All of them show the physiological characters of damaged plant under the environment hardness. The correlation analysis between PRO、MDA and protective enzymes activity showed: the positive correlation of the change of SOD、POD activity with the change of MDA contents is significant. The decrease of MDA will increase protective enzymes activity which in the leaf. The response of the physiological index to the environment hardness in different successional stage is not similar. First, some damaged characters appeared in the fourth stage; second, some index are stable in the third stage. It indicated that the third stage is a stable period.展开更多
四溴双酚A型环氧树脂(tetrabromobisphenol A type epoxy resin,TBEP)广泛应用于电子、航空航天工业,但因成本高,大规模应用受到一定的限制。以溴化木质素替代四溴双酚A制备阻燃性、耐热性高,成本低、可再生、环境友好的环氧树脂具有重...四溴双酚A型环氧树脂(tetrabromobisphenol A type epoxy resin,TBEP)广泛应用于电子、航空航天工业,但因成本高,大规模应用受到一定的限制。以溴化木质素替代四溴双酚A制备阻燃性、耐热性高,成本低、可再生、环境友好的环氧树脂具有重要意义。以木质素和溴化质素为原料,与双酚A混合制备环氧树脂,研究木质素添加量及溴化质素对环氧树脂热性能的影响。结果表明:木质素-双酚A型环氧树脂(lignin base bisphenol A type epoxy resin,LBEP)的热稳定性较TBEP高;当添加摩尔分数10%的木质素时,LBEP失重起始温度和峰值温度分别比TBEP高4.4℃和68.9℃,失重率低3.8%;溴化木质素-双酚A型环氧树脂(bromided lignin bisphenol A type epoxy,Br-LBEP)较LBEP的失重起始温度和峰值温度分别高112.2℃和93.7℃,热失重率低2.1%。表明Br-LBEP热稳定性较LBEP高,以溴化木质素替代四溴双酚A制备耐热性环氧树脂具有可行性。展开更多
油楠（Sindora glabra）为苏木科（Caesalpiniaceae）油楠属（Sindora）植物,是国家二级重点保护野生植物（中国植物志,1988;中国重点野生植物名录,1999）,具有油用、药用、观赏和材用等多种用途（杨锦昌等,2011a;Carvalho et al.,2005...油楠（Sindora glabra）为苏木科（Caesalpiniaceae）油楠属（Sindora）植物,是国家二级重点保护野生植物（中国植物志,1988;中国重点野生植物名录,1999）,具有油用、药用、观赏和材用等多种用途（杨锦昌等,2011a;Carvalho et al.,2005;韩剑准,2001）。鉴于油楠具有多种利用价值,有关加强油楠基础研究和促进油楠资源开发利用的呼吁越来越多（李荣生等,2006）。展开更多
文摘The minute size of orchid seeds have made them difficult to observe,orchid seeds germination and mortality of seedlings in suit difficult to study.Recently,a new technique was described by which orchid seeds were sowed and retrieved in the field under natural conditions.It is possible to conduct a quantitative study of orchid germination in suit and observe seasonal growth and mortality of seedlings.The technique has also enabled us to bait appropriate fungus from the germinated seeds and young seedlings,which could be beneficial both to the orchid propagation and conservation.For the further studies,the potential issue and application perspective of this technique are also discussed in this text.
文摘Study on shooting and growth rhythm of Pseudosasa japonica var. tsutsumiana resulted that shooting period was from March 3 to May 5, and shoot quantity accorded with partial normal distribution.Adult bamboo reached 70.19%. The height growth could be divided into initial, ascending, boosting and terminal stage.Daily increment of height growth was 1～2 cm at the initial stage(about 11 d), 2～3 cm at the ascending one(12 d), more than 3 cm at the boosting one(19 d). The maximum was 4.45 cm at boosting stage. By the terminal stage (4 d), the height growth decreased obviously and stopped rapidly at last. Height growth process of young bamboo accorded with the Logistic Equation. But the height growth was influenced by the underground temperature of 10 cm and 15 cm, as well as average daily temperature and the humidity, especially the underground temperature of 10 cm and 15 cm which had positive correlation with the daily increment of height growth.
文摘The ancient Ginkgo population in Funiu Mountain in the west of Henan Province distributes to the south of the top of Funiu Mountain, where there are old geology, warm climate, superior environment and many kinds of Ginkgo from Paleozoic. The local have the intense sense of protecting the old trees and most villages are named as Ginkgo. From then on lots of ancient Ginkgo have still live in few people hillside.The population structure approach to nature and jamming is slight which account for the ancient Ginkgo population in the west of Henan Province maybe the nature multiplication of the ancient Ginkgo.
文摘Rooting characteristics of forest trees is an important trait both for silviculture and also for genetic improvement,but its progress which was made on its improvement was rather small due to the complexity and heavy work for rooting traits measurement.Fractal theory provided a new idea and also a method to deal with such complicated traits.The rooting characteristics based on cuttings of 46 poplar clones were investigated,poplar cuttings were cultivated in two kinds of medium,perlite and fresh water.Pictures were took for each cutting with a digit camera and then edited with Photoshop 6.0,Fractal dimensions were obtained for each picture by the software(FDC1.0).For the two rooting traits(length,dry mass)investigated,there were significant differences existed among clones.The variation ranges of fractal dimension of cuttings were 1.173～1.533 for 46 clones cultivated in perlite,and 1.513～1.814 for 34 clones cultivated in water.A significant positive correlation was found between fractal dimension and dry mass of roots,thus,fractal dimension might be a substitutive index for rooting characteristics.In general,the more the cutting roots,the bigger the fractal dimension.
文摘In order to reveal the physiological reaction and adaptability of natural Sabina vulgaris community to sandy environment in different successional stages, we determined physiological index of drought_resistance of S.vulgaris under different successional stages by colorimetry in TuKe of Mu Us Sandland. The results showed that with the process of the succession, PRO and MDA contents increase first, and then decrease during the process of the succession. The variance analysis showed that the difference of the PRO contents among stages is more significant. The difference of the SOD and POD activity is more significant among stages, but the CAT activity has no significant change. In the fourth successional stage, the contents of MDA and PRO increase, the activity of SOD and POD increase. All of them show the physiological characters of damaged plant under the environment hardness. The correlation analysis between PRO、MDA and protective enzymes activity showed: the positive correlation of the change of SOD、POD activity with the change of MDA contents is significant. The decrease of MDA will increase protective enzymes activity which in the leaf. The response of the physiological index to the environment hardness in different successional stage is not similar. First, some damaged characters appeared in the fourth stage; second, some index are stable in the third stage. It indicated that the third stage is a stable period.
文摘四溴双酚A型环氧树脂(tetrabromobisphenol A type epoxy resin,TBEP)广泛应用于电子、航空航天工业,但因成本高,大规模应用受到一定的限制。以溴化木质素替代四溴双酚A制备阻燃性、耐热性高,成本低、可再生、环境友好的环氧树脂具有重要意义。以木质素和溴化质素为原料,与双酚A混合制备环氧树脂,研究木质素添加量及溴化质素对环氧树脂热性能的影响。结果表明:木质素-双酚A型环氧树脂(lignin base bisphenol A type epoxy resin,LBEP)的热稳定性较TBEP高;当添加摩尔分数10%的木质素时,LBEP失重起始温度和峰值温度分别比TBEP高4.4℃和68.9℃,失重率低3.8%;溴化木质素-双酚A型环氧树脂(bromided lignin bisphenol A type epoxy,Br-LBEP)较LBEP的失重起始温度和峰值温度分别高112.2℃和93.7℃,热失重率低2.1%。表明Br-LBEP热稳定性较LBEP高,以溴化木质素替代四溴双酚A制备耐热性环氧树脂具有可行性。
文摘油楠（Sindora glabra）为苏木科（Caesalpiniaceae）油楠属（Sindora）植物,是国家二级重点保护野生植物（中国植物志,1988;中国重点野生植物名录,1999）,具有油用、药用、观赏和材用等多种用途（杨锦昌等,2011a;Carvalho et al.,2005;韩剑准,2001）。鉴于油楠具有多种利用价值,有关加强油楠基础研究和促进油楠资源开发利用的呼吁越来越多（李荣生等,2006）。
