北美西部凤梨的入侵:生态编年史

Richard N. Mack
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引用次数: 823

摘要

Bromus tectorum L.是北美西部山间草原植被中最普遍的外来物种,大约在1889-1894年进入不列颠哥伦比亚省、华盛顿州和犹他州。到1928年左右,由于过度放牧和耕种,本地牧草逐渐减少,这种草已经达到了现在的分布,占据了华盛顿州、爱达荷州、俄勒冈州、内华达州、犹他州和不列颠哥伦比亚省的大部分多年生草地。在这一过程中,这种闭花交配的冬季一年生植物可能竞争性地取代了本地殖民者(包括闭花交配的美国一年生草)和顶极林分的优势植物。B. tectorum的传播表明,当预先适应、栖息地改变与进入同时发生、农业实践与植物生态的不知情一致以及本地植物对入侵的明显易感性都处于同一阶段时,外来物种可能取得的成功程度。
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Invasion of Bromus tectorum L. into Western North America: An ecological chronicle

Bromus tectorum L., the most ubiquitous alien in steppe vegetation in the intermountain West of North America, entered British Columbia, Washington, and Utah ca. 1889–1894. By ca. 1928 the grass had reached its present distribution occupying much of the perennial grasslands in Washington, Idaho, Oregon, Nevada, Utah and British Columbia as native grasses dwindled with overgrazing and cultivation. In the process this cleistogamous winter annual may have competitively displaced both native colonizers (including cleistogamous us annual grasses) as well as the dominants of climax stands. The spread of B. tectorum demonstrates the degree of success an alien may achieve when preadaption, habitat alteration simultaneous with entry, unwitting conformation of agricultural practices to the plant's ecology and apparent susceptibility of the native flora to invasion, are all in phase.

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