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首页> 外文期刊>Israel Journal of Plant Sciences >Landscape restoration in southern California forblands: response of abandoned farmland to invasive annual grass control.
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Landscape restoration in southern California forblands: response of abandoned farmland to invasive annual grass control.

机译：加利福尼亚南部前陆平原的景观恢复：废弃农田对年度入侵性草地控制的反应。

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A large-scale experiment using 1-ha plots was done to control invasive Mediterranean annual grasses, primarily Bromus spp., in farmlands abandoned for 20 years in southern California. Treatments were a grass-specific herbicide, and herbicide plus dethatching. Dethatching was done to improve the contact of herbicide with newly growing grass seedlings, and to remove litter that may potentially affect germination of native annuals. Native annuals had increased richness in response to grass control, but had low cover in all but two of six years when precipitation was adequate. Dethatching did not improve forb response. Two exotic species of Erodium were the greatest beneficiaries of exotic grass control, but the positive response of native forbs in spite of Erodium dominance suggests a competitive hierarchy of less intense interaction between the native forbs and Erodium than between native forbs and exotic grasses. After five years, grasses began to recover from the herbicide treatments, indicating the need for periodic management of exotic grasses to maintain richness and cover of native forbs. Shrubs that occur on adjacent hills did not recolonize during these six years, suggesting that the valley bottoms may have always been forblands rather than shrublands. The study shows that restoration can be used to rediscover the former vegetation of long-disturbed landscapes..
机译：进行了使用1公顷地块的大规模实验，以控制加利福尼亚南部被荒废20年的农田中入侵性地中海一年生禾本科植物，主要​​是Bromus spp.。处理方法是使用草专用除草剂，除草剂加去茅草。进行除草以改善除草剂与新生长的草苗的接触，并清除可能影响当地一年生植物发芽的凋落物。本地一年生植物增加了对草类作物的控制，但是当降水充足时，除了六年中的两年之外，其他所有植物的覆盖率都很低。去茅草并没有改善Forb的反应。铱的两个外来物种是外来草控制的最大受益者，但是尽管额本占优势，但原生本草的积极反应表明，原生本草和E之间的竞争等级比原生本草和外来草之间的竞争强度低。五年后，草开始从除草剂处理中恢复过来，这表明需要定期管理外来草，以保持其丰富和天然的前草覆盖。在这六年中，相邻山丘上发生的灌木丛并未重新定殖，这表明山谷底部可能一直是前生地而不是灌木地。研究表明，恢复可用于重新发现长期受干扰的景观的前植被。

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