长江中下游浅水湖泊中总氮及其形态的时空分布

Temporal and Spatial Distribution of Total Nitrogen and Its Species in Shallow Eutrophic Lakes of China

分析和比较了长江中下游 3个浅水湖泊———太湖、巢湖和龙感湖夏、秋和冬季沉积物和上覆水中的总氮及其氮形态 ,描述了氮及其各形态在 3个湖泊中的时空分布特征 .结果表明 :空间上 ,无论是在表层沉积物还是在上覆水中 ,太湖中总氮的含量均高于其他 2个湖泊 ,且在太湖和巢湖都呈现西高东低的分布特征 .氨氮在沉积物和上覆水及溶解态硝态氮在上覆水中的分布与总氮分布趋势基本相同 .巢湖沉积物中氨氮浓度所占的比例稍高于太湖和龙感湖 .在不同季节 ,表层沉积物和上覆水中的总氮含量冬季高于秋季和夏季 ,表层沉积物中氨氮浓度在秋季最高 .巢湖和龙感湖上覆水中的溶解态硝态氮在冬季浓度较高 ,而在太湖西北部这种季节差异几乎没有 。

The temporal and spatial distribution of total nitrogen(Tot-N) and its species in sediments and overlying water of three shallow eutrophic lakes (Taihu Lake, Chaohu Lake and Longganhu Lake) in China were examined and analyzed. The spatial characteristic showed that higher concentration of Tot-N in sediments and overlying water were observed in Taihu Lake. The concentration of (Tot-N) was higher in the west side than that in the east side in Taihu Lake and Chaohu Lake. The spatial distribution trend of disso...