基于灰色关联度法河口地区土壤盐分影响因子分析  

Application of Grey System Theory Evaluating the Influencing Factors of soil Salinity

作　　者：张同娟[1] 杨劲松[1] 刘广明[1] 杨奇勇[1] 

机构地区：[1]中国科学院南京土壤研究所,江苏南京210008

出　　处：《土壤通报》2010年第4期793-796,共4页Chinese Journal of Soil Science

基　　金：中国科学院知识创新工程重大项目(KZCX1-YW-08-01-02);国务院三峡办项目(SX[2007]-005);国家自然科学基金项目(40601100);国家"863"计划项目课题(2007AA091702;2006AA10A301)资助

摘　　要：通过对长江河口地区耕层及犁底层土壤电导率及其影响因子的连续动态监测,利用灰色关联分析建立了长江河口地区2006-2007年耕层及犁底层土壤电导率与各影响因素间的关联度。关联度分析结果表明：耕层：地下水位埋深〉蒸发量〉地下水电导率〉内河水电导率〉降雨量〉江水电导率;犁底层：地下水位埋深〉地下水电导率〉降雨量〉蒸发量〉江水电导率〉内河水电导率。表明地下水位是影响耕层及犁底层土壤盐分动态最为活跃、最为直接的因素;对于耕层土壤其次是蒸发量和地下水电导率与其关联度较大,降雨增加了表层土壤盐分的淋洗,在很大程度上可降低耕层土壤盐分的含量。地下水电导率、蒸发和降雨量对犁底层土壤盐分都有很强的影响且三者比较接近。本研究表明灰色关联度分析方法简单易行是土壤盐分影响因子分析的理想方法。Dynamic monitoring the topsoil and plow pan soil Electrical Conductivity（EC） and the influencing factors continuously in the Yangtze River Estuary,the degree of association of soil EC and the influencing factors was established by applying the theory and method of grey system in 2006-2007.The results showed that the degree of association in topsoil was Ground water depth 〉Evaporation〉 Groundwater EC〉Freshwater EC〉Precipitation 〉River water EC,and in plow pan soil was Ground water depth〉Groundwater EC〉Precipitation〉Evaporation 〉River water EC〉Freshwater EC.The water table was the most active and straightforward factor to topsoil EC and plow pan EC.For the topsoil the evaporation and Groundwater EC were the second influence factors,the precipitation increased the leaching and could lower the topsoil salinity content.For the plow pan soil,Groundwater EC,Precipitation and Evaporation all had big correlation.In addition the three factors＇value was similar.So the grey system method is simple and ideal method to analyze the soil salinity.

关 键 词：河口地区 灰色关联度 土壤电导率 影响因子 

分 类 号：S151.9[农业科学—土壤学]