陕西省鄠县罗什寺鸠摩罗什树,是法国梧桐即三球悬铃木(Platanus orientalis L.)的别称,属该种喜马拉雅山南麓的一种旱生类型,有别于我国广泛栽植的速生型法国梧桐。它于晋朝末年即公元5世纪,伴随着佛教的东传,由印度经陆路直接传入鄠县...陕西省鄠县罗什寺鸠摩罗什树,是法国梧桐即三球悬铃木(Platanus orientalis L.)的别称,属该种喜马拉雅山南麓的一种旱生类型,有别于我国广泛栽植的速生型法国梧桐。它于晋朝末年即公元5世纪,伴随着佛教的东传,由印度经陆路直接传入鄠县。原株于1940年末消亡,人们普遍认为此树在中国绝迹。其实,此前有人从原株取根蘖苗移栽或无性繁殖。西安市鄠邑区草堂寺现在保留有它的无性系分株3株,其传入时限1600年,经历了黄土高原干湿冷暖的沧桑巨变。它在这里能正常生长、开花结实和繁殖,可作为绿化乔木,在较干旱的地方试种和推广。展开更多
In Argentina, the Araucaria araucana forest occupies a vast area in the Northwest of Patagonia, following a pronounced gradient of increasing xericity from west to east over a short distance. These forests have been t...In Argentina, the Araucaria araucana forest occupies a vast area in the Northwest of Patagonia, following a pronounced gradient of increasing xericity from west to east over a short distance. These forests have been the subject of detailed studies due to their uniqueness and ecological relevance. In this context, an exhaustive investigation was carried out to understand the diversity and structure of these ecosystems. The objective was to study the floristic and ecological differences in humid and xeric areas along a west-east transect where A. araucana is distributed. Floristic surveys, geomorphological analyses, and bioclimatic data were examined. In Argentina, A. araucana integrates two distinct forest types: mesic and xeric. The xeric A. araucana forest constitutes a forest with floristic, genetic, geomorphological, and bioclimatic identity. The results highlight the importance of understanding the local variability of these ecosystems for the design of effective conservation strategies. Furthermore, they highlight the need for further research into the ecology and dynamics of these forests, especially in the context of climate change and human activities.展开更多
文摘耐旱苔藓植物常常单个个体矮小、生物量低,如何从细小的单个个体中有效提取总DNA是进一步开展居群遗传多样性研究的关键。本研究以古尔班通古特沙漠广泛分布的刺叶墙藓(Tortula desertorum)为对象,使用快速提取法、2×CTAB法及DNeasy plant mini kit试剂盒提取法等3种方法对刺叶墙藓单个个体的总DNA进行提取。结果表明,2×CTAB法提取的DNA纯度高,凝胶电泳显示无明显降解现象,适宜作为PCR扩增的模板。利用所提取的单个个体DNA为模板,建立了优化的RAPDI、SSR反应体系。
文摘陕西省鄠县罗什寺鸠摩罗什树,是法国梧桐即三球悬铃木(Platanus orientalis L.)的别称,属该种喜马拉雅山南麓的一种旱生类型,有别于我国广泛栽植的速生型法国梧桐。它于晋朝末年即公元5世纪,伴随着佛教的东传,由印度经陆路直接传入鄠县。原株于1940年末消亡,人们普遍认为此树在中国绝迹。其实,此前有人从原株取根蘖苗移栽或无性繁殖。西安市鄠邑区草堂寺现在保留有它的无性系分株3株,其传入时限1600年,经历了黄土高原干湿冷暖的沧桑巨变。它在这里能正常生长、开花结实和繁殖,可作为绿化乔木,在较干旱的地方试种和推广。
文摘In Argentina, the Araucaria araucana forest occupies a vast area in the Northwest of Patagonia, following a pronounced gradient of increasing xericity from west to east over a short distance. These forests have been the subject of detailed studies due to their uniqueness and ecological relevance. In this context, an exhaustive investigation was carried out to understand the diversity and structure of these ecosystems. The objective was to study the floristic and ecological differences in humid and xeric areas along a west-east transect where A. araucana is distributed. Floristic surveys, geomorphological analyses, and bioclimatic data were examined. In Argentina, A. araucana integrates two distinct forest types: mesic and xeric. The xeric A. araucana forest constitutes a forest with floristic, genetic, geomorphological, and bioclimatic identity. The results highlight the importance of understanding the local variability of these ecosystems for the design of effective conservation strategies. Furthermore, they highlight the need for further research into the ecology and dynamics of these forests, especially in the context of climate change and human activities.
