Han Da-Yong, Yang Yong-Xing, Yang Yun-Fei, Li Jian-Dong, Yang Yang
Ministry of Education Key Laboratory of Yangtze River Water Environment/State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Ying Yong Sheng Tai Xue Bao. 2012 Mar;23(3):666-72.
Species diversity pattern is a hot topic in the forward field of international biodiversity research. Taking a degraded successional series (six communities distributed in 144 isolated patches) of fragmented Leymus chinensis meadow in Songnen Plain as test objects, this paper studied the spatial patterns of alpha, beta, and gamma diversities and related mechanisms. Eighty seven plant species were recorded, but none of them were distributed across all patches. L. chinensis + Kalimeris integrifolia community or L. chinensis community had higher alpha, beta, and gamma diversities, with more rare species and endemic species, while Kochia sieversiana community had lower alpha, beta, and gamma diversities, with few rare species and no endemic species. The gamma diversity showed significant positive correlation with a diversity, but no correlation with beta diversity. There was a significant power function correlation between the a diversity and the area of single patch of the six communities, but no correlation between the beta diversity (Bray-Curtis similarity index, Sjk ) and the area of single patch of the communities except for L. chinensis + K. integrifolia. Both the alpha angamma diversity showed significant correlations with the mean patch area and total patch area, but the p3beta diversity did not. The higher the species richness in the communities, the more the rare species and endemic species, the larger the possibility of species depopulation in local patches was. The importance of beta diversity for shaping species diversity pattern was related to the degree of habitat fragmentation.
物种多样性格局是国际生物多样性研究前沿领域的一个热点话题。本文以松嫩平原退化的羊草草原片段化演替系列（6个群落分布于144个孤立斑块）为研究对象，研究了α、β和γ多样性的空间格局及相关机制。共记录到87种植物，但没有一种分布在所有斑块中。羊草 + 全叶马兰群落或羊草群落具有较高的α、β和γ多样性，有较多的珍稀物种和特有物种，而碱蓬群落的α、β和γ多样性较低，珍稀物种少且无特有物种。γ多样性与α多样性呈显著正相关，但与β多样性无相关性。6个群落的α多样性与单个斑块面积之间存在显著的幂函数相关性，但除羊草 + 全叶马兰外，β多样性（Bray-Curtis相似性指数，Sjk）与群落单个斑块面积无相关性。α和γ多样性均与平均斑块面积和总斑块面积呈显著相关，但β多样性与二者无相关性。群落中物种丰富度越高，珍稀物种和特有物种越多，局部斑块中物种灭绝的可能性就越大。β多样性对塑造物种多样性格局的重要性与栖息地破碎化程度有关。
