洞庭湖天然湿地营养元素的积累与归还效应研究  

Study on Accumulation and Restore Effect About Nutrients of Dongting Lake Natural Wetland

作　　者：席宏正[1] 康文星[2] 鲁利宇[1] 

机构地区：[1]湖南大学,长沙410082 [2]中南林业科技大学,长沙410004

出　　处：《水土保持学报》2009年第4期232-235,共4页Journal of Soil and Water Conservation

基　　金：国家科技部平台建设项目(20021220)

摘　　要：为探讨洞庭湖湿地营养元素的积累与归还效应,研究了洞庭湖天然湿地土壤对N,P2O5,K的储存能力以及湿地植物对N,P2O5,K的年固定归还量,其结果是:洞庭湖天然湿地土壤贮存N量为343.715×104t,贮存P(P2O5)的量为283.904×104t,贮存K的量为63.408×104t;植被固定营养元素的效应值为:固定N,P2O5,K的量分别为9 553.443 t/a,2 446.404 t/a,13 370.956 t/a。营养元素年归还系统的量为N 888.374 t/a,P2O5208.48 t/a,K 1 045.941 t/a。研究结果表明,洞庭湖湿地是一个庞大的天然营养库,在生物地球化学循环中起着十分重要的作用。In order to discuss the accumulation and restore effect of the nutritive elements about Dongting Lake wetland, the author has determined and studied the Dongting Lake natural wetland soil＇s storage power to N, P2O5, and K, as well as the wetland plant＇s fixed and restore quantity to N, P2O5, K every year. The result is as follows：Dongting Lake natural wetland soil restores N for 343. 715×10^4 t,P（P2O5） for 283. 904×10^4 t, K for 63. 408×10^4 t;Wetland vegetation fixed N for 9 553. 443 t/a, P2O5 for 2 446. 404 t/a, K for 13 370. 956 t/a . The nutritive elements restore to system is that N for 888. 374 t/a, P2Os for 208.48 t/a, K for 1 045. 941 t/a. The findings indicated that the Dongting Lake wetland is a huge natural nutrition store-house, it is playing the very vital role in the biogeochemistry circulation.

关 键 词：湿地 营养元素 积累 归还效应 

分 类 号：S158.3[农业科学—土壤学]