荒漠缀块生境中的植物集合种群动力学研究

We studied the population dynamics, interspecific competition, and the community structures of desert plants in north China. The results show that the water in the soil is the main factor that controls the plant population in desert communities. The plant extinction rate is high in seedling establishment stages. The individuals that survival pasted seedling establishment stages have relatively high expectation to completing their life cycle. The growth rates of desert plants during seedling establishment stages are lower than those of growing up stages. Desert plants are general locally distributed, and this may be related to the soil water distributions. The local populations in richer water habitats always have high plant densities. There is also density-dependent mortality in annual desert plants. It is always occurs in habitats with good water conditions. The outcomes of interspecific competition depend on the competition intensity between the competing pairs and on the structure of the environments.

以温带荒漠缀块生境为对象，通过集合种群动力学的理论探索、荒漠植物种群过程与群落稳定性分析等多种途径，较为系统地研究荒漠植物群落的结构、功能特征与生物多样性维持的生态学对策，丰富集合种群动力学的理论，为荒漠资源的管理和持续利用及荒漠化逆转等荒漠生态工程的实施提供理论和示范。