[ Objective] The paper was to understand allelopathy of gaseous volatiles of Eupatorium adenophorum stems and leaves on seed germination and seedling growth of P/nus yunnanens/s. [ Method] P. yunnanens/s seeds were tr...[ Objective] The paper was to understand allelopathy of gaseous volatiles of Eupatorium adenophorum stems and leaves on seed germination and seedling growth of P/nus yunnanens/s. [ Method] P. yunnanens/s seeds were treated by fresh stems and leaves of E. adenophorum in translucent airtight container under high concentration （0.069 4 g/cm3 ）, middle concentration （0.023 1 g/cm3 ） and lower concentration （0. 007 7 g/cm3 ）, respectively. [ Result] Gaseous volatiles affected seed germination process; with the increasing processing concentration, the day on which seeds began to germinate and the day reaching germination peak were delayed, and the germination quantity on the day reaching germination peak was decreased ; the day on which the germination quantity began to significantly re- duce was delayed ; the process curve was developed from sudden increase and sudden decrease to gentle change, and nearly became a beeline at high concentration. The effects of gaseous volatiles on seed germination （ seed germination rate, germination potential, germination index） and seedling growth （fresh weight, dry weight, radicle length, hypceotyl length） of P. yunnanens/s were basically consistent, showing a regularity that high concentration had stronger inhibition effect and the inhibition effect became weaker with the decreasing concentration of E. adenophorum. E. adenophorum was widely distributed under P. yunnanens/s forests, and might affect natural regeneration and growth of P. yunnanens/s via allelopathy. [ Conclusion ] The paper provides reference for scientific management of P. yunnanens/s forests.展开更多
为了探悉云南红豆杉内生真菌的多样性,研究了云南丽江维西地区云南红豆杉(Taxus yunnanensisCheng et L.K.Fu)内生真菌的种类组成及数量。从云南红豆杉根、茎、叶中分离获得115种内生真菌,经过形态学和ITS分析结果表明,这115种内生真菌...为了探悉云南红豆杉内生真菌的多样性,研究了云南丽江维西地区云南红豆杉(Taxus yunnanensisCheng et L.K.Fu)内生真菌的种类组成及数量。从云南红豆杉根、茎、叶中分离获得115种内生真菌,经过形态学和ITS分析结果表明,这115种内生真菌分属于21属,其中分布最广的类群是芽枝霉属(19种),其次是黑孢属(17种)和拟茎点霉属(14种),说明云南红豆杉不同部位内生真菌的数量、分布、种群及其组成存在差异,具有丰富的物种多样性。经初步检测,其中有4个菌种能够产生紫杉醇。展开更多
以山西朔州小黑杨(Populus×xiaoheiT.S.Hvang et Liang)人工林为试验材料,研究了3种栽植密度(1000、500、250株.hm-2)对小黑杨树木生长、木材生长量和主要物理力学性质的影响。结果表明,栽植密度对树木冠幅、冠长、胸径、湿心材面...以山西朔州小黑杨(Populus×xiaoheiT.S.Hvang et Liang)人工林为试验材料,研究了3种栽植密度(1000、500、250株.hm-2)对小黑杨树木生长、木材生长量和主要物理力学性质的影响。结果表明,栽植密度对树木冠幅、冠长、胸径、湿心材面积、边材面积和木材基本密度、顺纹抗压强度和MOE的影响达到极显著水平;对湿心材比例、边材比例和MOR的影响达到显著水平;对基本密度的径向变异有一定程度的影响,但不改变其变异的一般趋势,即从髓心向外,先下降后呈上升的变化趋势。展开更多
基金Supported by Provincial Level Key Constructive Disciplines of Yunnan Province"Silviculture Fund"(xkz200906)
文摘[ Objective] The paper was to understand allelopathy of gaseous volatiles of Eupatorium adenophorum stems and leaves on seed germination and seedling growth of P/nus yunnanens/s. [ Method] P. yunnanens/s seeds were treated by fresh stems and leaves of E. adenophorum in translucent airtight container under high concentration （0.069 4 g/cm3 ）, middle concentration （0.023 1 g/cm3 ） and lower concentration （0. 007 7 g/cm3 ）, respectively. [ Result] Gaseous volatiles affected seed germination process; with the increasing processing concentration, the day on which seeds began to germinate and the day reaching germination peak were delayed, and the germination quantity on the day reaching germination peak was decreased ; the day on which the germination quantity began to significantly re- duce was delayed ; the process curve was developed from sudden increase and sudden decrease to gentle change, and nearly became a beeline at high concentration. The effects of gaseous volatiles on seed germination （ seed germination rate, germination potential, germination index） and seedling growth （fresh weight, dry weight, radicle length, hypceotyl length） of P. yunnanens/s were basically consistent, showing a regularity that high concentration had stronger inhibition effect and the inhibition effect became weaker with the decreasing concentration of E. adenophorum. E. adenophorum was widely distributed under P. yunnanens/s forests, and might affect natural regeneration and growth of P. yunnanens/s via allelopathy. [ Conclusion ] The paper provides reference for scientific management of P. yunnanens/s forests.
文摘为了探悉云南红豆杉内生真菌的多样性,研究了云南丽江维西地区云南红豆杉(Taxus yunnanensisCheng et L.K.Fu)内生真菌的种类组成及数量。从云南红豆杉根、茎、叶中分离获得115种内生真菌,经过形态学和ITS分析结果表明,这115种内生真菌分属于21属,其中分布最广的类群是芽枝霉属(19种),其次是黑孢属(17种)和拟茎点霉属(14种),说明云南红豆杉不同部位内生真菌的数量、分布、种群及其组成存在差异,具有丰富的物种多样性。经初步检测,其中有4个菌种能够产生紫杉醇。
文摘以山西朔州小黑杨(Populus×xiaoheiT.S.Hvang et Liang)人工林为试验材料,研究了3种栽植密度(1000、500、250株.hm-2)对小黑杨树木生长、木材生长量和主要物理力学性质的影响。结果表明,栽植密度对树木冠幅、冠长、胸径、湿心材面积、边材面积和木材基本密度、顺纹抗压强度和MOE的影响达到极显著水平;对湿心材比例、边材比例和MOR的影响达到显著水平;对基本密度的径向变异有一定程度的影响,但不改变其变异的一般趋势,即从髓心向外,先下降后呈上升的变化趋势。
