东太湖河流水生植物群落对磷及有机质的生态效应

ECOLOGICAL EFFECT OF THE AQUATIC COMMUNITY ON THE PHOSPHORUS AND ORGNICE MATTER AT STREAM IN THE EAST TAIHU

河流是湖泊生态系统的重要组成部分,也是物质运移的重要通道。沉积物中的TP及其有机质（SOM）含量对湖泊生态系统有着重要影响,也是衡量该系统健康状况重要标志。本文通过对太湖的入湖河流及其与太湖交汇区域不同植物群落沉积物中总磷、有机质含量分析,结果表明：河流沉积物TP含量高于湖泊沉积物,是其1～2倍,SOM远低于其与湖泊交汇处沉积物的含量。而TP与SOM二者相关不显著,河流沉积物及其与太湖交汇区沉积物TP及SOM二者相关不显著,但方差分析表明两者差异性显著（P〈0.05）。

Phosphorus and organice matter can modify the local geochemistry of wetland system,but the effects of the river on lake,are not well understood.To investigate the relative importance of stream nutrient and transformation processes on the intersection with lake in the sediments at different macrophytes communities,total phosphorus（TP） and sediment organice matter（SOM） concentrations of the river and the intersecton with Lake Taihu were monitored.Some results were found that TP retained of the sediment in the river was 1-2fold greater than the intersection of river with lake Taihu.SOM contention in river was lower than that in estuarine region.There were not significant relationship（P〈0.005） between total phosphorus and organice matter in the sediment with growing of the defferient macrophyte communities.The total phosphorus and organice matter were significantly different（P〈0.005） in the sediment with growing of different macophytes communities.