广西桂平市鳄蜥种群及栖息地现状的分析研究

2004年7月，对广西桂平市鳄蜥种群及其栖息地进行了调查，并首次采用量化指标对鳄蜥栖息的回水塘进行了分析。结果表明：桂平市鳄蜥分布区已破碎成白沙坑、牛头坳和黄凉冲、大藤峡碧滩段三个片段，分布区面积从58．39km^2减小至16．14km^2。鳄蜥种群数量约为150只。通过主成分分析发现，鳄蜥栖息回水塘的长度、宽度、水深、塘底组成、水温、栖枝类型和栖枝高度是影响鳄蜥选择回水塘的主要因子，而海拔、栖枝直径、水流速度的影响不大。鳄蜥倾向栖息于常绿阔叶林生境中，对溪沟的坡向和沟型选择不明显。

Study on Current Population and Habitats of Shinisaurus crocodilurus in Guiping City, Guangxi

The population and habitats of Shinisaurus crocodilurus in Guiping City, Guangxi were investigated and analyzed by quantitative index in July 2004. The results indicated that the habitats of Shinisaurus crocodilurus were broken into three fragments i . e. Baishakeng, Niutouao-Huangjingchong and Bitan of Dateng gorge, and the distribution area decreased from 58.39 km^2 to 16.14 km^2 at present. The population size was estimated to be 150 individuals. Habitats selection analysis indicated the length, width, water depth, compcxsition, water temperature of backtracking po31 bed, perch type and perch height were main factors for Shinisaurus crocodilurus selecting to the backtracking pool, but the elevation, perch diameter and water speed were not the main factors. The Shinisaurus crocodilurus inclined to perch in the habitats of the evergreen broadleaf forest and not showed the administration to slope aspect and ditch type of small stream.