云南拉市海越冬灰雁生境选择

为了研究拉市海越冬灰雁（Anser anser）生境选择的机制,于2013年12月～2014年2月调查了云南丽江拉市海高原湿地省级自然保护区越冬灰雁在农地、草地、灌丛、休耕地、沼泽泥滩地、浅水区和水中央深水区等7种基本生境中的分布情况。结果表明,越冬灰雁对不同生境有明显的偏好性,在43个调查样方当中,31个为浅水生境,9个为沼泽生境,3个为草地生境;而对调查样方和对照样方的13个生境因子差异性分析中发现,主要制约灰雁生境选择的因子是干扰频率、距干扰的距离（P〈0.01）以及水清澈度、植被盖度（P〈0.05）,人为干扰是影响拉市海越冬灰雁分布的最重要因素。

Habitat Selection of Overwintering Graylag in Lashihai,Yunnan Province

The habitat selection of graylag during December 2013 to February 2014 at Lashihai Lake in Yunnan Province was studied. The habitats were categorized as farmland area,grassland,bushwood,fallow,wetland,shallow water and deepwater. By the result of this research,there were 31 hallow water,9 wetland and 3 grassland. Compared with the 13 ecological factors between survey quadrats and comparing quadrats,the main impact factors were the frequency of disturbance（ FD） and the distance to disturbance（ DD）（ P〈0. 01）. The second impact factors were the clear degree of water（ CW） and the vegetation coverage（ VC）（ P〈0. 05）. The most important impact factor of restricting to the habitat selection of graylag was human influence.