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首页> 外文期刊>Journal of Wildlife Management >Multi-Scale Associations of Grassland Birds Response to Cost-Share Management of Conservation Reserve Program Fields in Illinois
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Multi-Scale Associations of Grassland Birds Response to Cost-Share Management of Conservation Reserve Program Fields in Illinois

机译：伊利诺伊州草原鸟类对保护储备计划领域成本分担管理的反应

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The Illinois State Wildlife Action Plan targeted the Conservation Reserve Program (CRP) as important improvable acres for grassland and grassland-successional bird species of greatest need for conservation. A large portion of CRP grasslands in Illinois and elsewhere lack floristic and structural diversity because of the absence of management and the extensive planting of monotypic grasses such as tall fescue {Schedonorus phoenix). The 2006 Farm Bill included the mid-contract management (MCM) provision requiring landowners with new CRP enrollments to provide habitat improvement midway through the 10-15-year contract duration. We compared the effects of 3 approved MCM regimes (i.e., fall strip disking, fall glyphosate spraying, fall glyphosate spraying followed by spring legume drill-seeding) on grassland bird communities in 60 tall fescue-dominated CRP fields in south-central Illinois during 2006-2008. We modeled relative density of dickcissels (Spiza americana), Henslow’s sparrows (Ammodramus henslowii), and eastern meadowlarks (Sturnella magna) as a function of microhabitat, patch-level patterns, and landscape composition using a multi-scale assessment approach. We detected 10 grassland-associated bird species (e.g., Henslow’s sparrow, northernbobwhite Colinus virginianus], sedge wren Cistothrus platensis], Savannah sparrow [Passerculus sandwichensis, grasshopper sparrow Ammodramus savannarum) that are recognized as species of greatest need for conservation under the Illinois State Wildlife Action Plan. Mean total bird densities and species richness were greater in glyphosate-sprayed fields (5.0 birds/ha; 11.5 species) and glyphosate drill-seeded fields (4.4 bird/ha; 12.4 species) than in disked (3.4 birds/ha; 8.7 species) and reference(3.1 birds/ha; 7.5 species) fields. The avian conservation value of glyphosate sprayed and glyphosate drill-seeded fields increased 34.2% and 32.6% post-management, respectively, but we did not detect change in disked and reference fields. Our models indicate that density of each of the focal species is likely associated with changes in plant species diversity and habitat structure resulting from management actions but is also influenced by landscape composition. Despite an overall positive response ofthe grassland bird communities to glyphosate-based treatment regimes in tall fescue CRP fields in south-central Illinois, the response of Henslow’s sparrow density to glyphosate was not consistently positive.
机译：《伊利诺伊州州野生动物行动计划》将保护储备计划（CRP）定位为重要的可耕地，用于最需要保护的草地和草地成功鸟类。伊利诺伊州和其他地区的大部分CRP草原缺乏植物和结构多样性，这是因为缺乏管理和大量种植单型草（例如高羊茅（Schedonorus phoenix））。 2006年《农业法案》包括合同中管理（MCM）条款，该条款要求拥有新的CRP注册的土地所有者在合同期10-15年的中途改善栖息地。我们比较了2006年在伊利诺伊州中南部60个以羊茅为主的CRP高地上3种已批准的MCM方案（即，秋季剥脱法，秋季草甘膦喷涂，秋季草甘膦喷涂，春季豆科植物种子播种）对草原鸟类群落的影响。 -2008。我们使用多尺度评估方法，以密度，斑块级模式和景观组成为模型，对白ck（美国的Spiza），Henslow的麻雀（Ammodramus henslowii）和东部的草地雀（Sturnella magna）的相对密度进行了建模。我们检测到10种与草地相关的鸟类（例如，Henslow的麻雀，北美洲白 Colinus virginianus），莎草w Cistothrus platensis]，大草原麻雀[Passerculus sandwichensis ，蚱hopper麻雀 Ammodramus savannarum ）被认为是最需要的物种根据《伊利诺伊州州野生动物行动计划》进行保护。草甘膦喷洒田地（5.0鸟/公顷; 11.5种）和草甘膦播种田地（4.4鸟/公顷; 12.4种）的平均总鸟类密度和物种丰富度高于盘状（3.4鸟/公顷; 8.7种）和参考（3.1鸟/公顷; 7.5种）。施用草甘膦和草甘膦播种田的禽类养护价值在管理后分别增加了34.2％和32.6％，但我们没有发现圆盘和参考田的变化。我们的模型表明，每个焦点物种的密度可能与管理措施导致的植物物种多样性和栖息地结构变化有关，但也受景观组成的影响。尽管在伊利诺伊州中南部高羊茅CRP田地上草地鸟类群落对基于草甘膦的处理方式总体上表现出积极的反应，但亨斯洛的麻雀密度对草甘膦的反应并非始终是积极的。

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