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首页> 美国卫生研究院文献>Evolutionary Applications >No effect of seed source on multiple aspects of ecosystem functioning during ecological restoration: cultivars compared to local ecotypes of dominant grasses
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No effect of seed source on multiple aspects of ecosystem functioning during ecological restoration: cultivars compared to local ecotypes of dominant grasses

机译：种子来源对生态恢复期间生态系统功能的多个方面均没有影响：与优势草的当地生态型相比品种

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摘要

Genetic principles underlie recommendations to use local seed, but a paucity of information exists on the genetic distinction and ecological consequences of using different seed sources in restorations. We established a field experiment to test whether cultivars and local ecotypes of dominant prairie grasses were genetically distinct and differentially influenced ecosystem functioning. Whole plots were assigned to cultivar and local ecotype grass sources. Three subplots within each whole plot were seeded to unique pools of subordinate species. The cultivar of the increasingly dominant grass, Sorghastrum nutans, was genetically different than the local ecotype, but genetic diversity was similar between the two sources. There were no differences in aboveground net primary production, soil carbon accrual, and net nitrogen mineralization rate in soil between the grass sources. Comparable productivity of the grass sources among the species pools for four years shows functional equivalence in terms of biomass production. Subordinate species comprised over half the aboveground productivity, which may have diluted the potential for documented trait differences between the grass sources to influence ecosystem processes. Regionally developed cultivars may be a suitable alternative to local ecotypes for restoration in fragmented landscapes with limited gene flow between natural and restored prairie and negligible recruitment by seed.
机译：遗传原则是使用当地种子的建议的基础，但是在修复物中使用不同种子来源的遗传区别和生态后果方面的信息很少。我们建立了一个野外试验，以测试优势草原草的品种和当地生态类型是否在遗传上是不同的，并且对生态系统功能的影响差异。将整个样地分配给栽培品种和当地生态型草源。每个完整地块中的三个子图被播种到唯一的下属物种库中。日益占主导地位的禾本科植物高粱（Sorghastrum nutans）在遗传上与当地生态型不同，但两种来源之间的遗传多样性相似。两种草源之间的地上净初级生产力，土壤碳积累和净氮矿化率没有差异。在物种库中，四年来草源的可比生产率在生物量生产方面显示出功能上的等效。下属物种占地上生产力的一半以上，这可能削弱了已记录的草源之间的性状差异影响生态系统过程的潜力。区域发展的品种可能是当地生态型的合适替代品，可用于在自然和恢复的大草原之间基因流有限且种子募集可忽略的零散景观中恢复。

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