[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.