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理解群落的动态变化是群落生态学的一个重要内容,但目前为止在较大尺度的森林群落中相关的研究还很少.基于本研究提出的一种群落动态的随机零模型,我们设计了一种度量群落动态变化的方法.在考虑群落内的物种组成、环境因子及空间因子可能对群落动态变化产生不同的影响的前提下,利用鼎湖山20 hm2大样地2次调查数据,采用方差分解分析了群落动态变化与以谱系结构为代表的物种组成、环境因子及空间因子3种因子之间的关系.结果表明,整体上空间因子是影响群落动态的主要因素.在小尺度上(<30 m),环境因子有比物种组成更高的解释量;在更大尺度上,物种组成的解释量更高.随着空间尺度的增加,环境因子的解释量在40 m尺度达到最大(6.42%),增加到50 m后其解释力消失;与环境因子不同,物种组成对于群落动态的影响力从20 m的1.12%逐步增加到50 m的17.79%.研究发现,环境因子和群落的物种组成结构能够在不同的空间尺度上影响群落的动态变化.
Understanding the dynamic changes of communities is an important part of community ecology, but so far there are few studies on large-scale forest communities.Based on a random-zero model of community dynamics proposed in this study, we design a Based on the fact that the species composition, environmental factors and spatial factors in the community may have different impacts on the community dynamics, the second survey data of 20 hm2 large plots in Dinghushan were used and the variance decomposition The relationship between community dynamics and species composition, environmental factors and space factors, which are represented by pedigree structure, was analyzed. The results showed that the spatial factors were the main factors influencing community dynamics. At the small scale (<30 m), the environmental factors have a higher explanation than the species composition, and on a larger scale, the explanation of the species composition is higher.With the increase of spatial scales, the interpretation of environmental factors reaches the maximum at 40 m (6.42% ), And its explanatory power disappeared when it increased to 50 m. Different from environmental factors, the influence of species composition on community dynamics gradually increased from 1.12% of 20 m to 17.79% of 50 m. Now, the environmental factors and community composition of the species structure in different spatial scales affect the community dynamics.