苏北海涂围垦区土壤质量综合评价研究

Evaluation of soil quality in reclaimed coastal regions in North Jiangsu Province

  • 摘要: 以苏北海涂围垦区为研究区域, 选取与作物生长密切相关的理化性质作为评价指标, 分别采用相关分析法与主成分分析法确定权重系数, 并应用综合指数法对土壤质量进行定量评价, 获取区域土壤质量综合评价分级图。结果表明: 围垦区土壤质量状况总体较差, 存在一定程度盐渍化危害, 土壤有机质和氮素含量偏低, 碱解氮亏缺尤为严重。有机质是重要的土壤质量评价因子, 土壤盐分与地下水矿化度是土壤质量的主要限制因子。相关分析法和主成分分析法对土壤质量的评价结果较为一致, r2 = 0.933 9**。围垦区不同部位土壤质量差异较大, 围垦区西部棉花地土壤质量总体优于东部水稻地, 且不同评价方法得到的土壤质量分级图具有空间相似性。该结果可为滩涂区中、低产地的精确施肥、障碍土壤的科学管理提供参考依据。

     

    Abstract: Soil quality in reclaimed coastal regions in North Jiangsu Province was quantified using comprehensive indexing method and selected soil physico-chemical property and crop growth index. Weight values were accordingly determined by correlation and principal component analysis method from which soil quality maps were developed. Results indicate a generally poor state of soil quality across reclaimed lands, with a substantial level of soil salinity. Soil organic matter (SOM) and N content is relatively low, with severe deficiency in alkali-hydrolysis N. SOM is the most important enabling factor of soil quality while soil salinity and groundwater mineralization are the limiting factors of soil quality. Both correlation and principal component analyses of soil quality have a similar and consistent result (r2=0.933 9**). Soil quality in different areas of reclaimed lands differs significantly and soil quality in cotton fields is generally superior to that in rice fields. There exists significant spatial similarity between soil quality maps developed from different methods. The findings of the study are important references for precision fertilization in moderate-to-low yield farmlands and in scientific management of problematic soils in coastal regions.

     

/

返回文章
返回