扩散限制和环境筛选对子午岭森林群落构建的相对贡献

doi:10.3864/j.issn.0578-1752.2013.22.011

Abstract

Abstract: 【Objective】Improved regional eco-environment is critical to forming ecologically sustainable land-use policies and accelerating agricultural production. Restoring natural vegetation is one of the effective approaches to improve the ecological conditions, and understanding what governs community assembly is the first step, but has been a continuing challenge for ecologists.【Method】In the Ziwu Mountains of the Loess Plateau, how the community assembly is affected by environmental filtering and dispersal limitation was examined by using canonical variation partitioning and Mantel tests, i.e. partition the variation of community composition/dissimilarity distance between environmental and spatial factors/distance. Three species groups (herb layer, shrub layer and tree layer) that differ in traits of likely importance for environmental filtering and dispersal limitation (height and growth form) were analyzed. 【Result】 All forest types were simultaneously governed by environmental control and spatial processes; together, these processes explain 29% to 65% of the species composition variation (P<0.01). However, the effects of these two processes were varied among species groups; shrub layer and tree layer species were dominated by spatial process while there was similar importance between two processes for herb layer. Mantel and partial Mantel tests showed significant correlations between community dissimilarity and environmental dissimilarity/geographical distance (P<0.05). Herb layer showed a high correlation with environmental dissimilarity while shrub and tree layer displayed high correlations with geographical distance. 【Conclusion】 The assembly of plant communities in the Loess Plateau appears to be simultaneously driven by environmental filtering and dispersal limitation. This case study shows the importance of the dispersal limitation in understanding the forests assembly in the Loess Plateau. Consequently, it is important that management planning for restorations of natural vegetations take into account both habitat heterogeneity and geographical differences.

Key words: niche assembly , neutral assembly , community similarity , canonical variation partitioning , Mantel test

WANG Shi-Xiong, GUO Hua, WANG Xiao-An, FAN Wei-Yi. Dispersal Limitation Versus Environment Filtering in the Assembly of Plant Communities in the Ziwu Mountains[J].Scientia Agricultura Sinica, 2013, 46(22): 4733-4744.

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