轻组有机质对太湖沉积物氮、磷矿化的影响  

Effect of Light Fraction Organic Matter on Mineralization of N and P in Taihu Lake Sediments

作　　者：杨春霞[1] 王圣瑞[1] 金相灿[1] 吴丰昌[1] 

机构地区：[1]中国环境科学研究院湖泊生态环境创新基地,国家环境保护湖泊污染控制重点实验室,北京100012

出　　处：《环境科学研究》2009年第9期1001-1007,共7页Research of Environmental Sciences

基　　金：国家自然科学基金项目(40703017,40873079);中央级公益性科研院所基本科研业务专项(2007KYYW27)

摘　　要：采用连续淹水培养试验研究轻组有机质（LFOM）对鼋头渚（Y）和贡湖（G）2种不同污染程度太湖沉积物氮、磷矿化的影响.结果表明,去除LFOM并没有改变沉积物氮、磷的矿化趋势.试验初期,沉积物累积矿化氮、磷量急速上升,之后增速变慢,至峰值后迅速下降,42 d时达到最小值,并持续至试验结束.经过77 d的培养试验,不同处理的2种不同污染程度沉积物有24%～39%的总氮（TN）和7%～26%的总磷（TP）被矿化;污染较重的沉积物Y的净矿化氮、磷量和矿化速率均高于沉积物G;去除LFOM使沉积物的净矿化氮、磷量和矿化速率均有所降低,其中沉积物Y的净矿化氮、磷量分别降低了110.86和145.26mg/kg,下降了15%和74%,沉积物G降低了195.13和29.99 mg/kg,下降了40%和50%.沉积物Y的氮、磷平均矿化速率分别降低了3.01和5.36 mg/（kg.d）,沉积物G分别降低了6.35和1.30 mg/（kg.d）.The effect of light fraction organic matter（LFOM） on nitrogen（N） and phosphorus（P） mineralization in the sediments of Taihu Lake was investigated under continuously water-logged incubation.The sediments from Yuantouzhu（Y） and Gonghu（G） at different pollution levels were used.The results showed that the effect of LFOM removal on N and P mineralization of different trophic sediments was similar.At the early stage,the amounts of N and P mineralization increased quickly,but later the extent decreased;after reaching the peak values,the amounts decreased to the lowest at 42 d and then stayed minimum until the end of the incubation.During 77 day anaerobic incubation,the results showed that 24%-39% of TN and 7%-26% of TP of the studied sediments were mineralized.The amounts and rates of N and P mineralization from the heavily polluted sediment Y were higher than those of sediment G,in which the amounts and rates decreased after removal of the LFOM.In sediment Y,the amounts of N and P mineralized decreased 110.86（mg/kg）（amounts to 15%） and 145.26（mg/kg）（74%）,respectively;in sediment G,the amounts decreased were 195.13（mg/kg）（40%） and 29.99（mg/kg）（50%）,respectively.After the LFOM removal,the average mineralization rates of N and P decreased 3.01（mg/（kg·d）） and 5.36（mg/（kg·d）） for sediment Y,and 6.35（mg/（kg·d）） and 1.30（mg/（kg·d）） for sediment G,respectively.

关 键 词：氮 磷 湖泊沉积物 矿化 连续淹水培养 轻组有机质 

分 类 号：X142[环境科学与工程—环境科学]