风浪扰动中太湖OA对水体磷循环影响的原位实验研究

在一次风速12 m.s-1的强风浪过程中,对太湖梅梁湾一浅水区水体有机聚集体（organic aggregates,OA）丰度、颗粒态有机质含量、碳、氮和磷含量等基本理化性质的变化情况进行了连续的原位监测和分析,同时分析了基本的水质指标.结果表明,风浪过程会对水体OA的理化性质及水体的磷循环产生极大的影响：在风浪过程中...

Effects of Wind-Induced Wave on Organic Aggregates Physical and Chemical Characteristics in a Shallow Eutrophic Lake(Lake Taihu) in China

The physical and chemical characteristics were continually monitored during a wind course one time per day, which continued for 10 days, and other water physical and chemical parameters were concomitantly monitored. Organic aggregates(OA) abundance was significantly higher during wind period than calm stage and the maximum of OA abundance, which occurred the same day when wind speed was highest, was 29 times higher than that in the calm stage. Although OA-C, OA-N and OA-P concentration were decreased during wind period, the total C, N and P contend in OA were increased for the increased OA abundance. Additionally, suspended soil(SS), total nitrogen(TN) and total phosphorus(TP) concentration during wind period were significantly higher than that of clam stage, but total dissolved phosphorus(TDP), total dissolved nitrogen(TDN) and soluble reactive phosphorus(SRP) were insignificantly different. During the wind, OA alkaline phosphatase activity(OA-APA) and OA enzymatically hydrolyzable phosphorus(OA-EHP) both increased significantly, which accelerated organic phosphorous mineralization and SRP release. The results indicate that SRP release induced by wind in shallow lakes may comes from suspended matter, especially OA release rather than directly comes from sediment.