广东合水水库淤积物基本化学特征分析及农业资源化利用评价  

Chemical Characteristics Analysis and Agricultural Utilization Appraisal to Sediment of Heshui Reservoir in Guangdong Province

作　　者：宁建凤[1] 邹献中[1] 杨少海[1] 陈勇[1] 魏岚[1] 

机构地区：[1]广东省农业科学院土壤肥料研究所,广东广州510640

出　　处：《水土保持学报》2008年第6期108-111,117,共5页Journal of Soil and Water Conservation

基　　金：广东省重点科技攻关项目(2005A30402007)

摘　　要：对合水水库19个淤积物样点养分和重金属含量进行了分析,结果表明:水库淤积物总体呈微酸性,全钾、有效钙和有效镁含量丰富,分别为26.01 g/kg,1 466.06 mg/kg和200.71 mg/kg;有机质、全氮、全磷、碱解氮、速效磷和速效钾等养分含量属于中等水平;阳离子代换量(CEC)为10.91 cmol/kg,具有较强的保肥、蓄肥能力。不同样点均可检测出Cu,Zn,Pb,Cd和Cr,仅大坝前样点Cd元素含量超标,其它样点各种重金属元素含量均在标准限值范围内。重金属单项污染指数和综合污染指数评价结果表明,除大坝前样点外,合水水库淤积物总体上处于清洁水平,不会影响水库淤积物的农用安全性。结合本文研究结果,将水库淤积物直接或与其它固体废弃物配合进行土地利用,是农业资源化利用的一种有效途径。To evaluate the chemical characteristics of sediment in Heshui reservoir, contents of several nutrients and heavy metals in 19 sediment samples were analyzed. The results showed that, reservoir sediment were abundant in nutrients of total potassium, available calcium and magnesium which were 26.01 g/kg, 1 466.06 mg/kg and 200.71 mg/kg respectively. The pH values of sediments were lower than 7.00 and displayed slightly acid in general. Contents of organic matter, total nitrogen and phosphorus, available nitrogen, phosphorus and potassium in sediments were moderate. The mean value of cation exchange capacity of sediment was 10.91 cmol/kg which indicated a better fertilizer holding capacity. Based on the second reference values for soil pollution specified in the GBI5618-1995, contents of Cu, Zn, Pb and Cr in all sediment samples were not polluted. Cd content of sediments in the sample which was near the reservoir dam had exceeded the second level of the national standard while Cd contents in other samples were not polluted. As estimated by single-factor and multifactor way, among the 19 sediment samples, most of the samples were clean except that one sample was polluted by Cd. The results of eveluation showed that there was no adverse impact for the agricultural utilization of sediments resource on the environment. These results indicated the sediment resources can be used in soil improvement which was an effective way for the sediment utilization.

关 键 词：合水水库 淤积物 资源化利用 

分 类 号：S825[农业科学—畜牧学] X705[农业科学—畜牧兽医]