草地群落物种多样性维持机制的研究Ⅲ.物种分布格局

群落物种多样性的维持机制是生物多样性是生物多样性研究的重要科学问题，群落物种分布格局的研究结果表明：22个种中有16个为聚集分布，4个为均匀分布，2个为随机分布。说明群落中多数物种为聚集分布，其格局尺度多小于0．04m^2。认为物种聚集分布可能在维持多样性中起重要作用，并在群落物种花期分布，物种实现生态位，种间关联与种间协变研究的基础上，提出了草地群落物种多样性维持机制的小尺度格局竞争假说。

Studies on the Maintaining Mechanism of Species Diversity of Grassland CommunityⅢ. Species Distribution Pattern

The maintaining mechanism of species diversity of community is an important question in biodiversity research. The results of the study on species distribution pattern of community showed that among 22 species studied, 16 species were in clumped distribution, 4 species were in uniform distribution, and 2 species were in random distribution. These results illustrated that most species in community were in clumped distribution, and their pattern scales were below 0 04?m 2 . Species in clumped distribution were considered to probably play an important role in maintaining diversity On the basis of the study on species florescence distribution, the realization of species niches, interspecific association and interspecific co variation, a new hypothesis on the maintaining mechanism of species diversity of community, that is, small scale pattern competition hypothesis, was put forward