水生漂浮型喜旱莲子草群落对底栖动物群落的影响

从2011年12月到2012年5月,分别在喜旱莲子草枯萎期、萌发期和繁盛期调查了七渔河阜阳段喜旱莲子草群落覆盖区和未覆盖区底栖动物群落结构。此次调查共采集到底栖动物12种,主要是一些耐污染的种类,包括环节动物、腹足类、甲壳动物和水生昆虫。在喜旱莲子草覆盖区和未覆盖区,底栖动物平均密度分别为312 ind·m-2和280 ind·m-2,平均生物量分别为1.76 g·m-2和0.6 g·m-2。生物多样性指数值在0.92和1.47之间。由于底栖动物各个类群生活习性不同,喜旱莲子草群落对底栖动物各个类群的影响也不相同。

Effects of aquatic floating type Alternanthera philoxeroides community upon zoobenthos community structure

From December 2011 to May 2012, the zoobenthos community in Qiyu River at Fuyang section were investigated at different water areas （covered by Alternanthera philoxeroides community and not） during three life stages of Alternanthera philoxe-roides （withered stage, germinative stage and luxuriant stage）. The total of 12 zoobenthos species were discovered which include Annelida, Gastropoda, Crustacea and Arthropoda, and most of the species are resistant to pollution. At the water area covered by Alternanthera philoxeroides community and not, the zoobenthos average density is 312 ind·m - 2 and 280 ind·m - 2 , respectively, and the average biomass is 1. 76 g·m - 2 and 0. 6 g·m - 2 respectively. Shannon-Wiener biodiversity index value ranges from 0. 92 to 1. 47. Because life habits of every zoobenthos group are different, the effects of aquatic floating type Alternanthera philoxeroides com-munity upon every zoobenthos group are different.