陕西泾惠渠灌区土壤质量综合评价研究

Comprehensive evaluation on soil quality of the irrigation area of Jinhuiqu,Sha’an Xi

以陕西省主要的粮食、蔬菜生产基地泾惠渠灌区为研究对象,通过对土壤质量现状的调查、现场采样和试验分析,选取土壤总盐量,pH,土壤有机质,碱解氮,速效磷,速效钾,Cu,Zn,Pb,Cd,Cr,As,Hg以及地下水硝酸盐含量14个指标,基于层次分析法在确定其权重的基础上,利用综合指数法对泾惠渠灌区的土壤质量进行了综合评价。结果表明:灌区75.3%的土壤质量处于优良水平,20.8%的土壤质量处于中等水平。总体看,泾惠渠灌区的土壤质量综合指数均值为0.82,属于二等,质量为良好土壤。指标选取得当,研究结果与灌区的实际情况相吻合,研究方法可靠。

Taking Jinghuiqu irrigation district that is one of the main grains and vegetables bases of Shaanxi province as study object,the current situation of soil quality was investigated and the soil samples were analyzed.And on the base of calculating index weights of soil quality assessment by using analytical hierarchy process,soil quality has been researched comprehensivly by using comprehensive index method.Fourteen indicators pH,Organic matter,alkali-hydrolyzable N,available P,available K,Cu,Zn,Pb,Cd,Cr,As,Hg,total soluble salt,nitrate in groundwater were chosen as an integrated indicator system.The results show that soil possessing high quality level in irrigation district was accounted to 75.3 %,and moderate level was accounted to 20.8 %.The average of soil quality comprehensive index was 0.82,which belonged to second-class,and the soil possessed high quality level.The conclusion is reasonabe in accordance with the practical situation.Assessment method of soil quality is reliable.