于2012年12月—2013年11月对滆湖水体进行了调查，分析了水体氮、磷及大型底栖动物的时空分布，初步探讨大型底栖动物群落结构与氮、磷环境因子的关系。结果表明，滆湖水体的ρ（TN）在冬春季较高，ρ（TP）四季的差异不大，在空间分布上，北部湖区的ρ（TN）、ρ（TP）均高于南部湖区；大型底栖动物出现频率最高的为霍甫水丝蚓和中国长足摇蚊，其丰度在时间上均表现为秋季＞夏季＞冬季＞春季，在空间上的规律性不明显；CCA 分析表明滆湖大型底栖动物群落结构随季节变化规律显著，且氮含量是滆湖底栖动物群落结构的重要影响因子；对优势种的丰度与氮磷的相关性分析结果显示，滆湖底栖动物优势种与 TN 和 NO－3－N 有显著的负相关关系。%Spatial and temporal variations of nitrogen and phosphorus in water and macrobenthos were analyzed here in the Gehu Lake from December 2012 to November 2013.The potential relationship between macrobenthos community structure and nitrogen -phosphorus factor were also discussed .The one-year monitoring data indicated that ρ(TN) was high in winter and spring,whileρ(TP) had little variation among four seasons .The content of ρ(TN) and ρ(TP) in the northern part of the lake were much higher than that in the southern part .Limnodrilus hoffmeisteri and Tanypus chinensis were dominant and the density was the highest in au -tumn,followed by summer and winter,and the lowest in spring.Spatial changes were not significant here .Based on the canonical correspondence analysis (CCA),the community structure variation was heavily dependent on the seasons ,and nitrogen played a key role in shaping the macrobenthos community structure in the Gehu Lake .Besides,the relationship between the density of dominant species and the nitrogen-phosphorus nutrients showed that the distribution of dominant species was significantly negatively related to the content of TN and NO-3 -N.
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