陕西省泾惠渠灌区土壤肥力质量变化趋势研究  

Tendency of Soil Fertility Quality Changing in Jinghuiqu Irrigation Area of Shaanxi Province

作　　者：易秀[1] 吕洁[1] 谷晓静 

机构地区：[1]长安大学环境科学与工程学院,西安710054 [2]西安市环境保护科学研究院,西安710002

出　　处：《灌溉排水学报》2011年第3期114-117,共4页Journal of Irrigation and Drainage

基　　金：教育部;国家外专局高等学校学科创新引智计划项目(B08039);陕西省水利厅重点项目

摘　　要：在收集陕西省泾惠渠灌区土壤普查资料的基础上,探讨了灌区土壤肥力质量从1987年到2009年的变化规律。结果表明,①1987年灌区土壤pH值变幅在8.1~8.9之间;有机质属于4~5级,含量为较缺乏到缺乏,全氮和碱解氮都为5级,皆为缺乏;速效磷含量中等,属于3级;速效钾含量丰富,属于1~2级;碳氮比值的变幅为7.25~9.90;氮磷比值变幅为1.7~6.9,氮素强度供应相对较磷素弱。②2007年灌区土壤有机质含量仍较缺乏;全氮为中等水平,但碱解氮含量较缺乏,土壤中速效磷和速效钾的含量丰富;养分的空间变异系数以全磷最小,为12.6%,速效磷最大,为38.9%,速效磷在空间上分布最不均匀。③泾惠渠灌区从1987年至2009年期间,土壤pH平均值由8.4下降为8.1;有机质平均增加了58.7%;碱解氮的平均增幅为37.8%,全氮为48.6%;土壤速效磷增幅为130%,全磷为59.6%;土壤速效钾的平均增幅为20.6%。On the base of collecting soil survey information in Jinghuiqu irrigation area of Shaanxi province,the tendency of soil fertility quality has been researched from 1987 to 2009.The results of the year of 1987 showed that average value of soil pH had changed from 8.1 to 8.9.Content of soil organic matter was at 4~5 level,which was under situation of less shortage or shortage.Total N and alkali-hydrolyzable N in soil were all at 5 level,and both were shortage.The content of available P was in the moderate level,which was at 3.The content of available K was rich,which was at 1~2 level.The changing range of ratio of C/N was 7.25~9.90,and that of N/P was 1.7~6.9.Supply intensity of nitrogen was weaker than that of phosphorous.The results of the year of 2009 showed that the content of organic matter was yet lack.Total N was in a moderate level,but the content of alkali-hydrolyzable N was low.Available P and available K in soil were rich.The coefficient of spatial variability for total P was smallest,which was 12.6%,and that of available P was biggest,which was 38.9%,These meant spatial distribution of available P was extremely heterogeneous.During 1987 to 2009 in Jinghuiqu irrigation area,average value of soil pH decreased from 8.4 to 8.1,and organic matter,alkali-hydrolyzable N,total N,available P,total P and available K increased by 58.7%,37.8%,48.6%,130%,59.6% and 20.6%,respectively.

关 键 词：土壤肥力 质量评价 变化趋势 泾惠渠灌区 

分 类 号：S158.2[农业科学—土壤学]