Direct evidence of phosphorus outbreak release from sedi-ment to overlying water in a large shallow lake caused by strong wind wave disturbance  

作　　者：ZHUGuangwei QINBoqiang GAOGuang 

机构地区：[1]NanjingInstituteofGeographyandLimnology,ChineseAcademyofSciences,Nanjing210008,China

出　　处：《Chinese Science Bulletin》2005年第6期577-582,共6页

基　　金：supported by the Key Project of Chinese Academy of Sciences(Grant No.KZCX1-SW-12);the National Natural Science Foundation of China(Grant No.40203007);the Special Subsidize of Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences.

摘　　要：Concentration variations of suspended solids (SS), total phosphorus (TP), dissolved total phosphorus (DTP), dissolved reactive phosphorus (SRP), and algae available phosphorus (AAP) in overlying water were ob- served during the coldest week in a year in Lake Taihu, a large shallow lake in China. Water samples at different water depths were collected with wind speeds of 8, 12, 0 and 0 m/s on 23, 24, 26 and 30 January 2004, respectively. On 23 Janu- ary 2004, SS concentration increased to 258 mg/L with a wind speed of 8 m/s lasting for 1 h. SS concentration kept increasing and reached to 507 mg/L when the strong wind lasted for 24 h and the peak value of wind-speed reached to 12 m/s on 24 January 2004. On 26 January 2004, SS concen- tration decreased to 51 mg/L with the wind speed smaller than 2 m/s lasting for about half a day. Then after five con- tinuous waveless days, SS concentration decreased to 21 mg/L on 30 January 2004. The observed results confirmed that sediments in Lake Taihu would be intensively suspended if the surface wind speed is greater than 8 m/s, and the mag- nitude of SS would increase with increasing wind-speed. Coupled with the intensive sediment suspending, concentra- tions of TP, DTP and SRP on 23 January were 0.210, 0.048 and 0.035 mg/L, respectively. And they were 0.299, 0.054 and 0.026 mg/L on 24 January, which were significantly higher than those on 26 and 30 January. SRP concentration on 23 January was twice as high as that observed on 30 January. It indicates that the strong wind may result in an outbreak re- lease of phosphorus. Moreover, AAP contents in suspended solids were 132, 97 and 226 mg/kg on 23, 24 and 26 January, respectively. Therefore, it could be estimated that this strong wind process resulted in 987 t of TP, 80 t of SRP and 167 t of AAP releasing from sediments into overlying water. Since such strong wind process is frequent in the area of Lake Taihu, dynamical release driven by wind-induced wave dis- turbance may be the main mode for internal release of phosphorus. ItConcentration variations of suspended solids (SS), total phosphorus (TP),dissolved total phosphorus (DTP), dissolved reactive phosphorus (SRP), and algae availablephosphorus (AAP) in overlying water were observed during the coldest week in a year in Lake Taihu, alarge shallow lake in China. Water samples at different water depths were collected with windspeeds of 8, 12, 0 and 0 m/s on 23, 24, 26 and 30 January 2004, respectively. On 23 January 2004, SSconcentration increased to 258 mg/L with a wind speed of 8 m/s lasting for 1 h. SS concentrationkept increasing and reached to 507 mg/L when the strong wind lasted for 24 h and the peak value ofwind-speed reached to 12 m/s on 24 January 2004. On 26 January 2904, SS concentration decreased to51 mg/L with the wind speed smaller than 2 m/s lasting for about half a day. Then after fivecontinuous waveless days, SS concentration decreased to 21 mg/L on 3D January 2004. The observedresults confirmed that sediments in Lake Taihu would be intensively suspended if the surface windspeed is greater than 8 m/s, and the magnitude of SS would increase with increasing wind-speed.Coupled with the intensive sediment suspending, concentrations of TP, DTP and SRP on 23 January were0.210, 0.048 and 0.035 mg/L, respectively. And they were 0.299, 0.054 and 0.026 mg/L on 24 January,which were significantly higher than those on 26 and 30 January. SRP concentration on 23 Januarywas twice as high as that observed on 30 January. It indicates that the strong wind may result in anoutbreak release of phosphorus. Moreover, AAP contents in suspended solids were 132, 97 and 226mg/kg on 23, 24 and 26 January, respectively. Therefore, it could be estimated that this strong windprocess resulted in 987 t of TP, 80 t of SRP and 167 t of AAP releasing from sediments intooverlying water. Since such strong wind process is frequent in the area of Lake Taihu, dynamicalrelease driven by wind-induced wave disturbance may be the main mode for internal release ofphosphorus. It must have important effects on the n

关 键 词：磷 沉积物 藻类植物 环境污染 湖泊 富营养化 

分 类 号：X524[环境科学与工程—环境工程]