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首页> 外文期刊>Ecological restoration >Changes in Vegetation Structure through Time in a Restored Tallgrass Prairie Ecosystem and Implications for Avian Diversity and Community Composition
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Changes in Vegetation Structure through Time in a Restored Tallgrass Prairie Ecosystem and Implications for Avian Diversity and Community Composition

机译：恢复的高草草原生态系统中植被结构的时间变化及其对鸟类多样性和群落组成的影响

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Grassland birds are one of the most endangered taxa in temperate North America. Because many species declines havebeen linked to habitat fragmentation and loss, large-scale prairie restoration projects have the potential to provide criticalhabitat for these declining species. We examined how the structure of restored grassland habitat changes through timeand how diversity and community composition of grassland birds respond to these changes. Our study was completed atNeal Smith National Wildlife Refuge, a large-scale prairie restoration in central Iowa. Vegetation composition and structurewere measured at 42 restored grassland plots throughout the refuge in 2007. Birds were surveyed at these locations from1994 to 2007. Survey points were sorted into five categories (out of crop rotation for 1, 2, 3, 4-6, and > 6 y). In the initialphases of restoration, species such as horned larks, red-winged blackbirds, and killdeer were abundant. Other speciessuch as common yellowthroats and dickcissels were more common in established restored points. Henslow's sparrowsappeared only at survey points that were out of crop rotation for more than 6 years. Diversity peaked in survey pointsthat were 2-3 years out of crop rotation and points that were more than 6 years out of rotation. Community composi-tion shifted through the chronosequence of prairie plantings. Changes in diversity and shifts in community compositioncan be explained by changes in vegetative structure. Our results suggest that managing for a variety of restored prairiestages will best maintain the highest levels of avian diversity and abundance.
机译：草原鸟类是北美温带地区最濒危的生物群之一。由于许多物种的减少与栖息地的破碎和丧失有关，因此大规模的草原恢复项目有可能为这些正在减少的物种提供关键的栖息地。我们研究了恢复的草地栖息地的结构如何随时间变化，以及草地鸟类的多样性和群落组成如何响应这些变化。我们的研究是在爱荷华州中部的大型草原修复基地尼尔史密斯国家野生动物保护区完成的。在2007年对整个避难所的42个恢复草地场进行了植被组成和结构测量。从1994年至2007年在这些位置对鸟类进行了调查。调查点分为五类（作物轮作1、2、3、4-6和7）。 > 6年）。在恢复的初始阶段，有角的百灵，红翼的黑鸟和双胸斑species等物种丰富。在已建立的恢复点中，其他种类如普通的黄喉和白喉更常见。亨斯洛的麻雀只出现在超过6年的轮换期间。轮作周期2-3年的调查点和轮作周期超过6年的调查点的多样性达到峰值。草原种植的时间序列改变了社区构成。营养结构的变化可以解释多样性的变化和群落组成的变化。我们的结果表明，对各种恢复的草原进行管理将最好地保持最高水平的鸟类多样性和丰度。

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