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How Do Species Richness and Its Component Dependence Vary Along the Natural Restoration in Extremely Heterogeneous Forest Ecosystems?

Yuhang WuZeyu YangShiren ChenMingzhen SuiGuangqi ZhangQingfu LiuDanmei ChenFangjun DingLipeng Zang

出版	SSRN, 2023
URL	http://books.google.com.hk/books?id=tJBB0AEACAAJ&hl=&source=gbs_api

註釋The great habitat heterogeneity is a crucial contributor to the high species richness (SR) in karst forests. Yet, the driving factor behind the alterations in SR patterns during natural recovery remains unclear. In this study, forest dynamics plots were established along the natural restoration sequence of degraded karst forests in Maolan National Nature Reserve to compare the local and rarefied SR and quantify the dependence of SR on its components (including total community abundance (N), species abundance distribution (SAD), and conspecific spatial aggregation (CSA)). We explored how the SR and its component dependence varied along the restoration sequence and evaluated the degree of contribution of N and the probability of interspecific encounter (PIE) to local SR. It was found that the secondary forest stage (SG) exhibits the highest local SR, followed by the evergreen-deciduous broadleaved mixed forest stage (OG) and shrub-tree mixed forest stage (SC). After controlling for individual numbers, the rarefied SR remained increasing along the restoration sequence. At SC-SG, the contributions of N and SAD were significant at all scales, and the contribution of CSA was only significant at small scales. N positively contributed to differences in SR at all scales, and SAD had a negative contribution at small scales during the SG-OG stage. In addition, local SR varied more significantly with PIE than with N. Our study emphasized the importance of separately evaluating the components that shape the diversity patterns in forest ecology and management.