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首页> 外文期刊>Plant and Soil >Soil heterogeneity and plant species diversity in experimental grassland communities: contrasting effects of soil nutrients and pH at different spatial scales
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Soil heterogeneity and plant species diversity in experimental grassland communities: contrasting effects of soil nutrients and pH at different spatial scales

机译：实验草地社区土壤异质性和植物物种多样性：土壤养分对比不同空间尺度的对比作用

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Background and aims Current knowledge of soil heterogeneity-diversity relationships (HDR) is largely based on studies manipulating single factor, but the advancements in HDR may require a comprehensive experiment incorporating multiple factors. Methods We conducted a three-year field experiment in which a seed mixture of 16 common grassland species was sown in plots with heterogeneous soils consisting of small (10 cm x 10 cm) or large patches (30 cm x 30 cm) of low and high nutrients or low and high pH, and homogeneous soils with an even mixture of low and high nutrient/pH soils. Soil nutrients and pH were manipulated in separate treatments. We determined plant species richness and diversity at two focal scales (40 cm x 40 cm plot-scale and 10 cm x 10 cm patch-scale). Results Plot-scale richness and diversity were not influenced by soil heterogeneity, but patch-scale richness was lower in plots with heterogeneous nutrients than in plots where nutrients were distributed homogeneously. There was no difference between the two heterogeneous nutrient soils with different grain sizes. Patch-scale diversity was higher in heterogeneous pH soils of large patch size than in heterogeneous pH soils of small patch size or the homogeneous pH soil at the final harvest. Species richness and diversity quantified at both plot and patch scales declined in all soils over time. Conclusions The influence of soil heterogeneity on plant species diversity depends on whether the soil varies in nutrients or pH, and on the temporal-spatial scale at which species diversity and soil heterogeneity are measured. These results indicate that soil heterogeneity has the potential to promote plant coexistence and future HDR studies should consider multiple soil factors at various temporal-spatial scales.
机译：背景技术目前的土壤异质性 - 多样性关系（HDR）的知识主要基于操纵单一因素的研究，但HDR的进步可能需要包含多种因素的综合实验。方法我们进行了三年的田间实验，其中16种常见草地种类的种子混合物播种了由小（10cm×10cm）或低且高的大贴片（30cm×30cm）组成的异质土壤营养或低pH和高pH，均匀的土壤，均匀的低营养/ pH含量的混合物。在单独的处理中操纵土壤营养和pH。我们确定植物物种在两个焦平尺度（40厘米x 40cm绘制和10cm×10cm斑纹）的植物物种丰富性和多样性。结果情节规模丰富性和多样性不受土壤异质性的影响，但在异质营养成分的图中较低的斑块尺度富含性比在均匀分布的图中较低。两种具有不同粒度的两种异质营养土之间没有差异。在大贴片尺寸的异质pH尺寸下的斑块分集比在最终收获的小斑块尺寸的异质pH土壤中的异质pH尺寸或均匀pH土壤中的均匀性pH。在所有土壤上随着时间的推移，在绘图和补丁尺度上量化的物种丰富性和多样性。结论土壤异质性对植物物种多样性的影响取决于土壤是否因营养素或pH而异，并测量物种多样性和土壤异质性的时间空间尺度。这些结果表明，土壤异质性具有促进植物共存的潜力，未来的HDR研究应考虑各个时间空间尺度的多种土壤因素。

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