茂兰喀斯特森林溪流水生昆虫群落构成及水质生物评价

对茂兰国家级自然保护区6条溪流中水生昆虫进行采集与鉴定,分析水生昆虫群落组成、结构、特征和ETP昆虫季节变化.共采集到水生昆虫11 783个,分别隶属7目41科,蜉蝣目、半翅目和毛翅目为三大优势类群,其个体数占总个体数的58.55％;香农—威纳多样性指数水质评价表明西竹溪流水质为轻度污染外,其余5条溪流的水质都能达到清洁标准;科级水平生物指数（FBI）的评价表明6条溪流均为清洁标准以上.

The Investigation of Aquatic Insects and Water Quality Bioassessment in Maolan Karst Forest

Aquatic insects in lower order streams under landscapes in Maolan Karst forest were collected and identified to analyze the commu- nity composition, seasonal dominant concentration and foundational feeding group. The stream water quality was assessed by biological indica- tor using Shannon-Weiner diversity index and biotic index, Totally 11 783 aquatic insect individuals were collected and identified to 41 fami- lies, 7 orders. Trichoptera, Ephemeroptera and Hemiptera were dominant groups, accounting for 58.55% of all the aquatic insects collected. The results of Shannon-Weiner diversity index analysis suggested that water quality of all streams was good at anytime except for Xizhu stream which was slightly polluted ; The results of family-level biotic index suggested that water quality of all streams was good.