RELATIONSHIPS BETWEEN SPATIAL ENVIRONMENTAL HETEROGENEITY AND PLANT SPECIES DIVERSITY ON A LIMESTONE PAVEMENT
RELATIONSHIPS BETWEEN SPATIAL ENVIRONMENTAL HETEROGENEITY AND PLANT SPECIES DIVERSITY ON A LIMESTONE PAVEMENT
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DOI：
10.1111/j.0906-7590.2003.03604.x
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发表时间：
2003-12
期刊：
影响因子：
5.9
通讯作者：
J. Lundholm;D. Larson
中科院分区：
文献类型：
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作者：
J. Lundholm;D. Larson
还没有实证研究检验单峰物种丰富度梯度上的多样性和空间异质性之间的关系。研究了加拿大安大略省南部阿尔瓦尔石灰岩路面144个0.18m2样地的多样性与环境因子的关系，包括样地内土壤深度、微地形和微场地组成的空间异质性。物种丰富度与平均土层深度和相对海拔呈单峰相关。微生境异质性和土壤深度异质性与物种丰富度呈正相关。单峰梯度的丰富度峰值对应于空间异质性最大的样地。然而，物种丰富度和均匀度的最佳预测模型表明，分株密度和洪水等其他因素是该系统多样性的主要决定因素。研究结果表明，当考虑平均土壤深度的影响时，土壤深度异质性对多样性有影响，单峰丰富度峰值与环境因子的高度空间异质性有关，这对我们理解空间异质性如何有助于植物群落多样性的维持具有重要意义。
No empirical studies have examined the relationship between diversity and spatial heterogeneity across unimodal species richness gradients. We determined the relationships between diversity and environmental factors for 144 0.18 m 2 plots in a limestone pavement alvar in southern Ontario, Canada, including within-plot spatial heterogeneity in soil depth, microtopography and microsite composition. Species richness was unimodally related to mean soil depth and relative elevation. Microsite heterogeneity and soil depth heterogeneity were positively correlated with species richness. and the richness peaks of the unimodal gradients correspond to the maximally spatially heterogeneous plots. The best predictive models of species richness and evenness, however, showed that other factors, such as ramet density and flooding, are the major determinants of diversity in this system The findings that soil depth heterogeneity had effects on diversity when the effects of mean soil depth were factored out, and that unimodal richness peaks were associated with high spatial heterogeneity in environmental factors represent significant contributions to our understanding of how spatial heterogeneity might contribute to diversity maintenance in plant communities.