赣江流域水生植物多样性分析

Analysis on the diversity of hydrophyte in Gan River Sstream

选取赣江流域21个国家或省控水质监测断面,于赣江枯水期(11月)和丰水期(4月)进行水生植被样方调查,共发现水生植物22科46种,其中挺水植物30种,沉水植物10种,浮叶植物和漂浮植物各3种,这些水生植物在赣江流域组成28种群丛,10种群系。对枯水期和丰水期赣江流域上、中、下游水生植物的覆盖度、生物量和多样性(Patrick指数、Shannon-wiener指数)进行了比较,发现枯水期水生植物的覆盖度和多样性明显小于丰水期,赣江流域中游水生植物的覆盖度和多样性明显大于上游和下游,特别是下游。我们认为,流速、水位、基底状况、人为干扰可能是影响赣江水生植被生长和分布的关键因素。

We selected 21 national or provincial water quality monitoring sections from the Gan River stream and investigated the aquatic vegetation sampling in dry season（November）and wet season（April.）respectively.We found that there were 46 species of aquatic plants belonging to 22 families in Gan River Stream,which were composed by 30 submerged plants,10 emergent plants,3floating-leaved plants,and 3floating plants.Aquatic plant community type,was consisting of 28 associations in 10 formations.The biomass and diversity indices（Patrick index,Shannon-Wiener index）were also compared in different stream stages in dry season and wet season.This,indicated that the community cover and diversity indices in dry season ex were less than in wet season and the community cover and diversity in midstream of Gan River greater than both upstream and downstream.The results suggested that the flow rate,water level,substrate condition and human disturbing might be the key factors to effect the growth and distribution of aquatic plants in Gan River.