阳宗海湖滨湿地沉积物砷和有机质对磷赋存形态的影响  

Effects of arsenic and organic matter on the speciation of phosphorus in the sediments of Yangzonghai lakeside wetland

作　　者：李梦莹[1] 郑毅[1] 刘云根[1,2] 侯磊[1,2] 王妍[1,2] 梁启斌[1,2] 

机构地区：[1]西南林业大学环境科学与工程学院,昆明650224 [2]西南林业大学农村污水处理研究所,昆明650224

出　　处：《农业环境科学学报》2016年第11期2171-2179,共9页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(31560147;51469030;31460551);西南林业大学林学一级学科后备人才培养计划项目

摘　　要：以云南省阳宗海南岸湖滨湿地为研究对象,研究了沉积物中总砷(TAs)、总磷(TP)及各形态无机磷的含量及空间分布特征,并对沉积物中TAs和有机质(OM)含量与各形态磷的相关性进行了分析。结果表明:沉积物TAs含量(1.84~24.37 mg·kg^(-1))处于土壤环境质量标准Ⅲ级限值的警戒线,表层富集明显,湖滨湿地对砷具有拦截作用;沉积物TP含量受上游人为干扰方式影响,农田和农村综合干扰样带的TP含量最高(604.13 mg·kg^(-1)),表层富集明显,湖滨湿地对外源磷也有截留作用,无机磷形态中以磷石灰型(Ca_(10)-P)为主,活性磷酸二钙磷(Ca_2-P)和磷酸八钙磷(Ca_8-P)、潜在释放的磷酸铝盐(Al-P)和磷酸铁盐(Fe-P)、惰性的闭蓄态磷酸盐(O-P)含量均较低;沉积物TAs和OM含量对磷的赋存状态均存在影响,主要与砷-磷在沉积物上的竞争吸附作用以及沉积物环境因素的变化有关。Yangzonghai lakeside wetland located in Yunnan Province was selected as the research object, and sediment samples were collected. The contents and distribution characteristics of total arsenic（TAs）, total phosphorus（TP）and each speciation of inorganic phosphorus of these samples were determined, and the correlation analyses between contents of arsenic and organic matter（OM）and each speciation of phosphorus were conducted. It was found that the contents of TAs in the sediments were near the level Ⅲ value of environmental quality standard for soils, whereas that of TP in the sediments were affected by the manners of upstream human disturbance and the contents of TP in the sampling belt under the comprehensive disturbance of farmland and village showed the highest values. The contents of TAs and TP showed significant accumulation in the surface layer of sediment, and reduction effects both of arsenic and phosphorus could be noticed by lakeside wetland. Ca10-P was the dominant component among all the speciation of inorganic phosphorus, whereas the contents of the rest speciation of phosphorus（including active Ca2-P and Ca8-P, potential-release Al-P and Fe-P, inert O-P）were relatively lower. Both of the contents of arsenic and OM in the sediments had marked effects on the speciation of phosphorus, which was related to the competition effects of adsorption to the sediments between arsenic and phosphorus and also the changes of environmental factors. These results could provide a scientific basis for the prevention and management of Yangzonghai Lake pollution.

关 键 词：阳宗海湖滨湿地 沉积物 砷-磷 无机磷形态 

分 类 号：X53[环境科学与工程—环境工程]