贵州喀斯特石漠化区白刺花群落主要种群生态位分析

Niche Characteristic of Dominant Species of Sophora davidii Community in Guizhou Karst Rocky Area

通过对贵州喀斯特区白刺花(Sophora davidii)群落野外样地调查,分析其组成类型中12个优势种的生态位宽度、生态位相似性比例及生态位重叠。结果表明,生态位宽度排在前5位的分别是白刺花、粉枝莓、火棘、灰毛浆果楝、竹叶椒,白刺花利用资源的能力较强;白刺花在喀斯特石漠化生境中的适应能力较强,并且根系发达,具有较强的固土护坡能力;各种对的生态位相似比例在0～1之间不等,物种利用资源的相似程度差异较大;12个种群间并未表现出显著的生态位完全重叠,各种群间利用资源的差异性显著,表明种群对资源的共享趋势并不明显,显示白刺花群落相对稳定。

Based on the investigation of the Sophora davidii community in karst area of Guizhou, the niche width, niche proportional similarity and overlapping of the populations of 12 dominant species were analyzed. The results showed that the top five niche width were Sophora davidii, Rubus biflorus, Pyracantha fortuneana, Cipadessa cinerascens（Pell.） Hand.-Mazz., Zanthoxylum planispinum. The ability of using resources of S. davidii was stronger. S. davidii was adapted to the karst rocky desertification environment. The proportion of niche similarity of all specie pairs were between 0 to 1, and the similarity de- gree of species in using resources was quite different. There were no significant niche overlaps among the 12 populations, but there were significant differences in using resources, which showed that the trends of sharing resources together among popu- lations was not obvious and S. davidii community was stable.