生态环境学报Issue(4)：630-635,6.
鄱阳湖沉积物中磷吸附释放特性及影响因素研究
Adsorption and release characteristic of phosphorus and influential factors in Poyang Lake sediment
摘要
Abstract
Sediment is the main accumulation library, which is the gathering place for external contaminants. Nutrients release also exists in lake sediment, which has a significant impact on the lake water environment. In this paper, the influence factors on phosphorus absorption and release in Poyang lake sediment is investigated. Under different environmental conditions, the variation of phosphorus concentrations of the overlying water is analyzed; the phosphorus transformation processes and its influence factors in the interface of overlying water and sediment are discussed. The results showed that phosphorus concentrations have a large difference between soil and water overlying and the initial adsorption rate was high during the initial stages of experiment. As the adsorption continues, the concentration difference between soil and overlying water decreased. When the adsorption time reached 30min, adsorption-desorption equilibrium completed and the equilibrium concentration of phosphorus of the overlying water was 8.648 mg·L-1. As it also can be seen from phosphorus adsorption isotherm, while the equilibrium concentration gradual increase, phosphorus uptake of soil increased rapidly firs and then slow until reaching phosphorus saturation. And the lower pH and the concentration of the overlying water, the stronger phosphorus adsorption in sediments. The conclusion has been come to on the contrary when pH was relatively large. Phosphorus adsorption in sediment under aerobic condition was much higher than under anaerobic condition. Adsorption rate was highest within 4hours under aerobic condition. Then adsorption capacity is very small until gradually saturated. Phosphorus adsorption was not prominent under anaerobic condition. When the experiment has carried on for 24 h, phosphorus concentration of overlying water remained constant and Phosphorus adsorption in sediment was saturated. It was necessary for high concentrations of dissolved oxygen in controlling the phosphorus release from sediment to overlying water and maintaining low concentrations of phosphorus in water. When the temperature was 5, 20 and 30℃, respectively, adsorption equilibrium has finished when the experiment has carried on for 24 h. Sediment phosphorus release rate under high temperature condition was higher than that under low temperature condition when phosphorus concentration of overlying water was low. The results can provide a reasonable assessment and theoretical interpretation of environment factors affecting phosphorus of lake water.关键词
沉积物/磷/吸附/释放/鄱阳湖Key words
sediment/phosphorus/absorption/release/Poyang Lake分类
资源环境引用本文复制引用
徐进,徐力刚,龚然,丁克强..鄱阳湖沉积物中磷吸附释放特性及影响因素研究[J].生态环境学报,2014,(4):630-635,6.基金项目
国家重点基础研究发展计划（2012CB417005）；国家自然科学基金项目(41101465；41371121；41271329)；中国科学院支持全国科学院联盟建设专项重大项目和江西省科技支撑项目 （41101465；41371121；41271329）
