山西五台县草地啮齿类动物空间生态位宽度及重叠度研究

研究了山西五台县草地啮齿动物生态位宽度及重叠度。结果表明:啮齿动物区系含2目、5科、11属、14种,平均捕获率为6.05%,除山地草原类草地与山地草甸类草地之间啮齿动物数量差异不显著外,其余各类之间均达差异显著水平(︱t︱t0.05);研究区域14种啮齿动物的空间生态位宽度指数在0.000 2~0.826 4,其中,生态位宽度指数0.5的种数占总种数的35.71%,0.1~0.5的占42.86%,0.1的占21.43%;生态位重叠度指数在0.837 7~0.000 2,没有生态位完全重叠的种,却有一定数量生态位完全不重叠的种;重叠度较高的占28.89%,重叠度较低的占51.11%,重叠度最低的占20.00%。生态位宽度及重叠度指数较低表明研究区域内啮齿类动物种的生态位分化程度较大。

Study on the spatial niche width and overlap of grassland rodents in Wutai County of Shanxi Province

The spatial niche width and overlap of grassland rodents in Wutai County of Shanxi Province were studied.The results showed that the fauna of rodents involved 14 species in 1 1 genus in 5 families in 2 orders. The average capture rate was 6.05%.The population quantity of rodents was significantly different among dif-ferent grassland types except mountain steppe and mountain meadow.The spatial niche index (SNI)of 14 spe-cies was from 0.000 2 to 0.826 4,the species that SNI was more than 0.5,between 0.1 to 0.5 and less than 0. 1 accounted for 35.71%,42.86% and 21.43% in total investigated species,respectively.The niche overlap in-dex was 0.8377 to 0.000 2.There was no species in complete niche overlap.However,some species had incom-plete niche overlap.The proportion of species with high niche overlap and low niche overlap was 28.89% and 20.00%.The low spatial niche width and overlap indicated that the rodent species had higher spatial niche dif-ferentiation.