20年来东北典型黑土地区土壤肥力质量变化

Spatial and temporal variability of soil quality in typical black soil area in Northeast China in 20 years

    摘要
  • 摘要: 通过大量样品分析和数据收集，研究了最近20年来东北典型黑土地区土壤肥力质量主要指标——pH、有机质、速效磷、速效钾和黏粒的变化情况，并在地理信息系统和地统计分析的辅助下，研究了该5项肥力指标以及综合肥力指数的时空变异规律。结果表明：20年中该地区土壤pH、有机质和速效钾平均含量明显降低，速效磷平均含量有较大增加；速效磷的变异系数变化最大，pH变化最小；20世纪80年代该地区土壤肥力综合指数以一、二级为主(80%以上)，但21世纪初土壤肥力质量几乎被二、三级地所占据(98%以上)。该地区土壤肥力质量明显降低

     

    Abstract: Geographical information system(GIS)combined with Geostatistics were applied to reveal the spatial and temporal variability of soil fertility quality in the topsoil(0～20cm)in the northeastern area of China during last two decades.Soil fertility quality indices in this study include pH,organic matter,available P,available K and clay.The results show that soil pH,organic matter and available K significantly decrease during the past 20 years while the available P increases with the biggest variation coefficient.The areas with the first and second grade of soil fertility quality were over 80% in 1980,whereas nearly 98% belonged to the second and third grade in 2000.So the soil fertility quality has declined in this area due to the intensive cultivation in the past 20 years.

     

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