在19世纪后期，生态学从它的自然历史和植物地理学的根源开始发展为一门独立的科学。

In the late nineteenth century, ecology began to grow into an independent science from its roots in natural history and plant geography.

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植物群落可以自由地聚集，并且，它们的特殊结构由该区域的具体历史情况所决定。

Plant communities assemble themselves flexibly, and their particular structure depends on the specific history of the area.

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在爱荷华州，黛安·奥特·惠利希望保护具有历史意义的植物品种，比如她的曾祖父100多年前从德国带到美国的种子。

In the state of Iowa, Diane Ott Whealy wanted to protect historic plant varieties, like the seeds her great-grandfather brought to the U.S. from Germany more than a hundred years ago.

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