鄱阳湖滨岸带对N素的净化及其影响因素

Purification of N and its affecting factors by Poyang Lake riparian zone

以鄱阳湖周边的土壤、水体为研究对象,在调查取样的基础上对典型滨岸带中N素分布及运移进行分析,利用主成分分析法对影响滨岸带对N素净化效果的因素进行排序。结果表明:鄱阳湖滨岸带采样点土壤TN质量比平均值为(0.721±0.275)mg/g,空间差异性大,且周边用地土壤TN质量比普遍高于临水区;水体TN质量浓度表现出周边内陆水体高于近岸湖水、汛前高于汛后的特征;滩地式滨岸带中的土壤TN质量比随滨岸带缓冲宽度增加而减少,且比值普遍低于堤岸式结构;滨岸带结构对N素净化率影响显著,滨岸带的净化效果与结构形式和植被配置有关。

Taking the soil and water around the Poyang Lake riparian zone as the research object,the distribution and the transport of nitrogen in the typical riparian zone of the Poyang Lake were analyzed,and the influence of purification effect of N was discussed by the principal component analysis,which were based on researching and sampling. The results show that TN mass ratio of the soil around the lake is higher than near shore and the average value of TN mass ratio is（ 0. 721 ± 0. 275） mg/g. TN concentration of water around the lake is higher than near shore,and TN concentration is higher before the flood season. TN mass ratio of the soil in the beach riparian zone is decreased with the increase of the buffer width,and the value is generally lower than the embankment riparian zone. The structure of riparian zone has significant influence on the purification rate of N,and the purification effect is related to the structure and vegetation configuration.