Taxus wallichiana Zucc.(Himalayan yew)is subject to international and national conservation measures because of its over-exploitation and decline over the last 30 years.Predicting the impact of climate change on T.wal...Taxus wallichiana Zucc.(Himalayan yew)is subject to international and national conservation measures because of its over-exploitation and decline over the last 30 years.Predicting the impact of climate change on T.wallichiana’s distribution might help protect the wild populations and plan effective ex situ measures or cultivate successfully.Considering the complexity of climates and the uncertainty inherent in climate modeling for mountainous regions,we integrated three Representative Concentration Pathways(RCPs)(i.e.,RCP2.6,RCP4.5,RCP8.5)based on datasets from 14 Global Climate Models of Coupled Model Intercomparison Project,Phase 5 to:(1)predict the potential distribution of T.wallichiana under recent past(1960–1990,hereafter‘‘current’’)and future(2050s and 2070s)scenarios with the species distribution model MaxEnt.;and(2)quantify the climatic factors influencing the distribution.In respond to the future warming climate scenarios,(1)highly suitable areas for T.wallichiana would decrease by 31–55%at a rate of 3–7%/10a;(2)moderately suitable areas would decrease by 20–30%at a rate of 2–4%/10a;(3)the average elevation of potential suitable sites for T.wallichiana would shift upslope by 390 m(15%)to 948 m(36%)at a rate of 42–100 m/10a.Average annual temperature(contribution rate ca.61%),isothermality and temperature seasonality(20%),and annual precipitation(17%)were the main climatic variables affecting T.wallichiana habitats.Prior protected areas and suitable planting areas must be delimited from the future potential distributions,especially the intersection areas at different suitability levels.It is helpful to promote the sustainable utilization of this precious resource by prohibiting exploitation and ex situ restoring wild resources,as well as artificially planting considering climate suitability.展开更多
为进一步研究湖北地区栽培南方红豆杉的化学成分,通过正、反相硅胶柱层析和高效液相色谱法等多种现代分离技术从南方红豆杉枝叶的二氯甲烷提取物中分离出13个二萜类成分,并通过波谱技术等方法对化合物的结构进行了鉴定,其结构分别鉴定为...为进一步研究湖北地区栽培南方红豆杉的化学成分,通过正、反相硅胶柱层析和高效液相色谱法等多种现代分离技术从南方红豆杉枝叶的二氯甲烷提取物中分离出13个二萜类成分,并通过波谱技术等方法对化合物的结构进行了鉴定,其结构分别鉴定为10-脱乙酰巴卡亭Ⅲ(1)、baccatinⅢ(2),baccatinⅣ(3),5-decinnamoyltaxinin J (4)、2-deacetoxytaxineine J (5),红豆素J (6),taxinine B (7),1β-hydroxybaccatin I (8),taxayuntin F (9),taxuspines A (10),taxin B (11),taxuspine W (12),taxuspine B (13),结果表明:湖北栽培南方红豆杉含有结构多样性的紫杉烷型二萜。展开更多
文摘Taxus wallichiana Zucc.(Himalayan yew)is subject to international and national conservation measures because of its over-exploitation and decline over the last 30 years.Predicting the impact of climate change on T.wallichiana’s distribution might help protect the wild populations and plan effective ex situ measures or cultivate successfully.Considering the complexity of climates and the uncertainty inherent in climate modeling for mountainous regions,we integrated three Representative Concentration Pathways(RCPs)(i.e.,RCP2.6,RCP4.5,RCP8.5)based on datasets from 14 Global Climate Models of Coupled Model Intercomparison Project,Phase 5 to:(1)predict the potential distribution of T.wallichiana under recent past(1960–1990,hereafter‘‘current’’)and future(2050s and 2070s)scenarios with the species distribution model MaxEnt.;and(2)quantify the climatic factors influencing the distribution.In respond to the future warming climate scenarios,(1)highly suitable areas for T.wallichiana would decrease by 31–55%at a rate of 3–7%/10a;(2)moderately suitable areas would decrease by 20–30%at a rate of 2–4%/10a;(3)the average elevation of potential suitable sites for T.wallichiana would shift upslope by 390 m(15%)to 948 m(36%)at a rate of 42–100 m/10a.Average annual temperature(contribution rate ca.61%),isothermality and temperature seasonality(20%),and annual precipitation(17%)were the main climatic variables affecting T.wallichiana habitats.Prior protected areas and suitable planting areas must be delimited from the future potential distributions,especially the intersection areas at different suitability levels.It is helpful to promote the sustainable utilization of this precious resource by prohibiting exploitation and ex situ restoring wild resources,as well as artificially planting considering climate suitability.
文摘为进一步研究湖北地区栽培南方红豆杉的化学成分,通过正、反相硅胶柱层析和高效液相色谱法等多种现代分离技术从南方红豆杉枝叶的二氯甲烷提取物中分离出13个二萜类成分,并通过波谱技术等方法对化合物的结构进行了鉴定,其结构分别鉴定为10-脱乙酰巴卡亭Ⅲ(1)、baccatinⅢ(2),baccatinⅣ(3),5-decinnamoyltaxinin J (4)、2-deacetoxytaxineine J (5),红豆素J (6),taxinine B (7),1β-hydroxybaccatin I (8),taxayuntin F (9),taxuspines A (10),taxin B (11),taxuspine W (12),taxuspine B (13),结果表明:湖北栽培南方红豆杉含有结构多样性的紫杉烷型二萜。
