中文摘要：

为了解不同生境下桑寄生植物分布的特点，研究选择了西双版纳地区受到一定程度干扰的片段化森林、林缘、公路边和种植园4种生境，采用样带调查法和路边调查法进行桑寄生和寄主植物的调查．共调查记录树木3170棵，调查到桑寄生植物3科，8属，17种，2变种和1亚种，被感染的寄主植物1567棵，分属61科，170属，276种；其中五蕊寄生、澜沧江寄生和鞘花感染的寄主种类最多，分别为235种、86种和46种．分析结果表明西双版纳桑寄生植物多分布在海拔1500In以下的区域；森林中的寄生感染率和寄生强度最低，桑寄生植物倾向于生长在物种多样性较低、食果鸟活动频繁的林缘、公路边、种植园等受一定程度干扰的环境中，高大树木促进桑寄生的聚集生长．通过对西双版纳地区不同生境下的桑寄生与寄主植物物种多样性和分布特点的调查比较，可为研究群落中桑寄生-寄主植物与环境的相互关系提供基础资料和实例，对热带地区生物多样性保护具有实践意义．

英文摘要：

To compare mistletoe diversity, distribution and their associations with the host trees in different habitats, mistletoes and the hosts were investigated using transect survey and roadside survey in four habitats in Xishuangbanna,Southwest China.A total of 17 mistletoe species, two varied species, and one subspecies were identified belonging to eight genera and three families. There were 276 host tree species were found belonging to 170 genera and 61 families.The most general mistletoe species were Dendrophthoe pentandra （ infecting 235 host species） ,Scurrula chingii var. yunnanensis （infecting 86 host species） and Macrosolen cochinchinensis （infecting 46 host species）.Mistletoes prefer to distribute in the areas with altitudes below 1 500 m.Mistletoe infection prevalence and intensity in forests were significantly lower than that of the other 3 habitats （ P〈0.01 ）, indicated that mistletoes prefer to distribute in the area with low host species diversity and frequently frugivorous bird activities and tend to aggregate in tall trees.The study provides some basic information and cases study for the relationship between mistletoe-host tree and their environment, which will benefit the biodiversity conservation in tropical regions.