贵州草海湿地农田沟渠沉积物氮磷的吸附动力学及影响因素  

Adsorption of Nutrient Elements by the Sediment from Ditch System in a Farmland-Wetland in Guizhou Province,China:Kinetics and Influential Factors

作　　者：薛飞[1] 刘文 夏品华[1] 林陶[1] 邓河霞[1] 孔祥亮[1,3] 张俊美[1] 

机构地区：[1]贵州师范大学贵州省山地环境信息系统和生态环境保护重点实验室,贵阳550001 [2]贵州草海国家级自然保护区管理局,贵州威宁553100 [3]贵州大学农学院,贵阳550001

出　　处：《农业环境科学学报》2012年第10期1999-2005,共7页Journal of Agro-Environment Science

基　　金：国家科技支撑计划课题(2011BAC02B02)

摘　　要：以草海-湿地农田沟渠系统为研究对象,运用模拟实验的方法,针对沟渠系统对氮磷的截留效用、沟渠沉积物对氮磷的吸附动力学及其影响因素进行了研究。结果表明,湿地农田沟渠系统对TP和TN的截留率分别为66.7%～79.7%和66.0%～76.4%,对NH4+-N的截留率最高,为82.8%～89.3%。沟渠沉积物与太湖、滇池沉积物相比较而言,沉积物对PO4-3-P和NH4+-N吸附平衡时间较长。盐度、[SO42-]和[NO3-]对PO43--P和NH4+-N的吸附都具有一定的抑制作用;而[Ca2+]对两者的影响具有明显的差别:Ca2+对PO43--P的吸附在低浓度下抑制,在高浓度下有促进作用;对NH4+-N的吸附具有明显的抑制作用,且当[Ca2+]浓度为5mg·L-1时吸附量最小。This research is to investigate the removal effects of ditch system in a farmland-wetland on nitrogen and phosphorus.A simulation experiment was carried out to study the kinetic characteristics of nitrogen and phosphorus adsorptions on the sediment of the agricultural ditch system in Caohai Wetlands.Results showed that the retention rates of the everglade farmland ditch system for TP,TN and NH 4 ＋-N were 66.7%～79.7%,66.0～76.4% and 82.8～89.3%,respectively.The equilibrium time of adsorption on nitrogen and phosphorus were long,comparing with the sediments from Taihu and Dianchi.With the increasing concentrations of the salinity,SO 42-and NO 3-,the sorption ability of PO 43--P and NH 4 ＋-N on the sediment declined,respectively.However,the influence of Ca 2＋ on PO 43--P sorption might be divided into two patterns：Restraining at low concentration and promoting at high concentration,and Ca^2＋ was found to have a significant restraining effect on NH 4 ＋-N adsorption,with the minimum adsorption value at the Ca^2＋ concentration of 5 mg·L^-1.

关 键 词：湿地农田 沟渠沉积物 吸附 NH4+-N PO43--P 

分 类 号：X522[环境科学与工程—环境工程]