Soil heterogeneity effects on tallgrass prairie community heterogeneity: An application of ecological theory to restoration ecology
Soil heterogeneity effects on tallgrass prairie community heterogeneity: An application of ecological theory to restoration ecology
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DOI：
10.1111/j.1526-100x.2005.00051.x
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发表时间：
2005-06-01
影响因子：
3.2
通讯作者：
Fiedler, AK
中科院分区：
文献类型：
--
作者：
Baer, SG;Collins, SL;Fiedler, AK
资源的空间异质性会影响自然群落中植物群落的组成和多样性。我们操纵土壤深度（两个级别）和养分供应（三个级别），以创建四个异质性处理（无异质性，深度异质性，养分异质性，深度+养分异质性）复制在农业领域播种到本地草原物种。我们的目标是确定资源异质性是否影响物种多样性和草地恢复过程中的群落发展轨迹。处理显著增加了土壤有效无机氮（N）、土壤含水量和透光率的异质性。植物多样性间接相关的资源异质性，通过积极的关系，在生产力和覆盖建立地下操作的变化。多样性呈负相关的平均覆盖率的优势草，柳枝稷（柳枝稷），随着时间的推移，在所有异质性处理，并导致随着时间的推移，异质性处理之间的社区收敛。这一品种在广泛的资源供应范围内的成功归因于净光合速率相当于或高于那些在存在较低的叶面氮含量的原生草原植物。我们的研究结果表明，资源的异质性本身可能不会增加多样性的优势物种可以成功地建立在整个范围内的资源可用性。这与关于生态过滤器对群落组装的作用的理论是一致的，因为建立一个最适合物理和生物条件的物种可以在确定群落结构中发挥非常重要的作用。
Spatial heterogeneity of resources can influence plant community composition and diversity in natural communities. We manipulated soil depth (two levels) and nutrient availability (three levels) to create four heterogeneity treatments (no heterogeneity, depth heterogeneity, nutrient heterogeneity, and depth + nutrient heterogeneity) replicated in an agricultural field seeded to native prairie species. Our objective was to determine whether resource heterogeneity influences species diversity and the trajectory of community development during grassland restoration. The treatments significantly increased heterogeneity of available inorganic nitrogen (N), soil water content, and light penetration. Plant diversity was indirectly related to resource heterogeneity through positive relationships with variability in productivity and cover established by the belowground manipulations. Diversity was inversely correlated with the average cover of the dominant grass, Switchgrass (Panicum virgatum), which increased over time in all heterogeneity treatments and resulted in community convergence among the heterogeneity treatments over time. The success of this cultivar across the wide range of resource availability was attributed to net photosynthesis rates equivalent to or higher than those of the native prairie plants in the presence of lower foliar N content. Our results suggest that resource heterogeneity alone may not increase diversity in restorations where a dominant species can successfully establish across the range of resource availability. This is consistent with theory regarding the role of ecological filters on community assembly in that the establishment of one species best adapted for the physical and biological conditions can play an inordinately important role in determining community structure.