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jiangqingbin

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[交流] 【交流】关于森林遗传多样性，帮忙翻译！

Forest genetic diversity

Forest genetic diversity is the pool of inherent differences among individuals of forest species. Forest tree species have many characteristics that may uniquely situate them to withstand the effects of human induced environmental changes. Paleoecological evidence has demonstrated that the geographic ranges of forest tree species have expanded and contracted several times since the last glacial epoch in response to environmental changes. These range fluctuations have been accomplished without any apparent loss of genetic diversity. Furthermore, phylogeographic studies indicate that gene lineages originating from separate glacial refugia have maintained sufficient genetic variation to allow them to adapt to novel habitats as the species expanded their ranges following glacial retreat. It is sometimes overlooked that habitat heterogeneity (elevation, slope, aspect, moisture etc.) in the refugia may have preserved adaptive genetic variation that has given rise to the local adaptation that we see in present-day tree populations. The maintenance of genetic diversity in the face of extensive habitat fragmentation is also a special concern for modern landscapes. Forest trees may, however, be buffered from the adverse effects of such fragmented landscapes.

请森林生态方面的牛人帮忙翻译！谢谢！30币重金答谢！

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1楼 2011-04-09 11:59:44

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

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reasonspare(金币+3): 谢谢分享 2011-04-14 11:44:38
jiangqingbin(金币+20): 谢谢，还有一部分没翻啊，继续啊 2011-04-14 14:52:00
jiangqingbin(金币+10): 2011-04-16 19:47:24

森林遗传多样性是森林物种个体间遗传变异的基因库。森林树种所具有的许多特点，是唯一能使其承受人类带来的对自然环境的改变。古生态研究迹象表明，自冰河世纪之后，森林树种在地理分布上已经扩张或收缩了好几次。在这些地理分布变化之后，并没有出现遗传多样性的减少。此外，种族地理学研究表明，基因谱系的起源也来自不同的冰川期生物种遗区，并且产生了遗传变异，使得物种能够适应冰川期之后扩张的新的栖息地。

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