大宁河回水区消落带土壤磷释放动力学研究  

Phosphorus Release Kinetics of the Soils from the Backwater-Fluctuating Zones of Daning River

作　　者：张晨光[1] 徐德星 张乃明[1] 郑丙辉[3] 

机构地区：[1]云南农业大学资源与环境学院,云南昆明650201 [2]蓝星环境工程有限公司,北京101318 [3]中国环境科学研究院河流与海岸带环境研究室,北京100012

出　　处：《土壤通报》2011年第5期1159-1164,共6页Chinese Journal of Soil Science

基　　金：科技部国际(中德)合作项目(2007DFA90510)资助

摘　　要：以三峡大宁河回水区消落带采集的6个土壤样品为研究对象,在室内模拟条件下,通过磷释放动力学实验,研究了三峡入库河流大宁河消落带土壤磷释放动力学特征,并分析了样品组成特征对释放动力学的影响,结果表明:指数动力学模型可以很好的拟合大宁河回水区消落带土壤样品磷释放动力学特征,前25 h为快反应,磷释放速度较大,随后进入慢反应,逐渐达到最大磷释放量;样品磷释放动力学特征与总氮、总磷和有机质等理化指标相关性较弱;样品磷释放动力学特征与Fe/Al-P的呈现极显著正相关关系,与Ca-P和O-P的相关性较弱,这说明样品中磷的释放量主要受Fe/Al-P含量控制。Phosphorus release kinetics characteristics of the sediments collected from six backwater-fluctuating zones from Daning River in the Three Gorges Reservoir were determined in laboratory simulating condition through the release kinetic experiments,and the relationship between the sediment composition and their phosphorus release characteristics was also investigated.An exponential kinetics model was used to fit the phosphorus release characteristics of the sediments from the backwater-fluctuating zones.The results showed that an exponential kinetics model was appropriated for the phosphorus release dynamics.During the early 25 h,the rate of phosphorus release was large,and then the rate was decreased until the largest released phosphorus content.The correlations between soil phosphorus release dynamics with the content of total nitrogen（TN）,total phosphorus（TP）,organic matter（OM） and Ca-P,O-P were not significant.But the correlations between it with Fe/Al-P content were significantly positive.It could be that Fe/Al-P content controlled soil phosphorus release dynamics.

关 键 词：大宁河 回水区 消落带 磷 

分 类 号：S147.2[农业科学—肥料学]