陆地植物群落物种多样性的梯度变化特征

研究陆地植物落物种多样性随环境因子及群落演替梯度的变化特征是揭示生物多样性与生态因子相互关系的重要方面，根据近期国内外的文献，综述了这方面的研究进展。随纬度的降低，通常物咱多样性随中，随不分梯度的变化，物种多样性的变化有６种趋势；随海拔高的变化，物处多样性有５种模式；随土壤养分梯度的变化，表现出不同的规律；演替过程中物种多样生的变化趋势相似。关于植物群落物种多样性梯度格局的机制有多种假说，但仍需进

A REVIEW OF GRADIENT CHANGES IN SPECIES DIVERSITY OF LAND PLANT COMMUNITIES

The study of changes in species diversity of land plant communities along environmental and successional gradients is important to understand the relationship between biodiversity and ecological factors. This paper reviewed current studies on this field. In general, species diversity of plant community decreases with changing from lower latitude to higher latitude. Along a water gradients (precipitation or moisture), there are 6 patterns in different areas and different combinations of environmental factors. In terms of elevation gradient, changes in species diversity of plant communities have 5 models. As for soil nutrient gradients, changes appear different in different area. Along the successional process (succession gradient), though the relationship is not monotonic for different environment, the changing trend of plant species diversity is the same. There are numbers of hypotheses about the mechanisms of species diversity pattern, but it has not been very well studied.