澄城县农业土壤养分时空变化特征

摘要

The research of soil nutrients (organic matter [OM];available nitrogen [AN];available phosphorus [AP];available potassium [AK]) is essential for improving the physical and chemical properties of soil,for protecting the environment and for sustaining agricultural development.This study used traditional statistics to evaluate the spatial and temporal variability of OM,AN,AP,AK content of Chengcheng county in 2014,and compared with the second national soil survey and the cultivated land productivity investigation and quality evaluation project in 1982.The results showed that OM and AN are on the lack level,AP at the appropriate level;and AK abundant level;Soil PH is weakly alkaline.Compared with the second national soil survey and the cultivated land productivity investigation and quality evaluation project in 1982,all the indexes increased significantly except for the slightly decrease of AK.The advice is that OM should be increased to maintain high and stable cereal crop yields.%研究耕地土壤养分(有机质(OM)、碱解氮(AN)、有效磷(AP)和速效钾(AK))时空分布特征对改善土壤理化性状、保护环境和促进农业发展具有重要意义.通过运用经典统计学方法对2014年澄城县农业土壤有机质、碱解氮、有效磷、速效钾时空变异进行分析,并与1982年土壤普查数据进行对比,结果表明:土壤有机质、碱解氮处于缺乏水平;有效磷处于适量水平;速效钾处于丰富水平;pH为弱碱性土.与土壤普查数据相比,澄城县土壤养分除速效钾略有下降外,其他养分都有了较大幅度的提高.建议该地区增加有机肥的投入,以保证作物稳产、高产.