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中文摘要：
物种多样性格局是国际生物多样性科学前沿领域热点问题.本文以松嫩平原破碎化羊草草甸退化演替系列（6种植物群落、144个斑块）为研究对象,系统地探讨了其!、β和γ多样性空间格局及其机理.结果表明：在羊草草甸退化演替系列中共发现87种植物,但没有一种能分布于所有斑块;羊草＋鸡儿肠群落或羊草群落的α、β和γ多样性较高,多稀有种和特有种;碱地肤群落最低,少稀有种,无特有种;γ多样性与α多样性显著正相关,但与β多样性无相关性.各植物群落的α多样性与单个斑块面积呈显著幂函数关系,β多样性（相似性指数Sjk）仅羊草＋鸡儿肠群落呈显著幂函数关系;斑块平均面积和总面积与α、γ多样性呈显著正相关,与β多样性无相关性.群落的物种丰富度越高,稀有种和特有种就越多,物种在局域斑块上灭绝的可能性越大;β多样性在物种多样性格局中的重要性与生境破碎化程度有关.
英文摘要：
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 !,β,and γ 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 !,β,and γ diversities,with more rare species and endemic species,while Kochia sieversiana community had lower !,β,and γ diversities,with few rare species and no endemic species.The γ diversity showed significant positive correlation with ! diversity,but no correlation with β diversity.There was a significant power function correlation between the α diversity and the area of single patch of the six communities,but no correlation between the β diversity（Bray-Curtis similarity index,S jk） and the area of single patch of the communities except for L.chinensis ＋ K.integrifolia.Both the α and γ diversity showed significant correlations with the mean patch area and total patch area,but the β 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 β diversity for shaping species diversity pattern was related to the degree of habitat fragmentation.
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