【摘要】 通过对湖南宁乡县2002年开展的耕地地力调查资料与1979年第二次土壤普查所得资料的对比分析,研究了宁乡县20多年来耕地肥力质量的变化情况及其影响因素。结果表明,土壤有机质、全氮含量大幅度增加,土壤有效磷含量成倍增加,土壤速效钾减少,土壤酸化严重。影响因素主要是土壤内外条件,不平衡施肥,酸雨和施肥习俗改变等。更多还原

【Abstract】 Based on comparison of data on soil survey in 1979 and investigation of cultivated soil fertility in 2002 of Ningxiang County, Hunan Province, the fertility change of cultivated soils in Ningxiang County and its influencing factors were analyzed. The results indicated that the soil organic matter, total N increased greatly, available P increased by times, steadily available K decreased significantly, the soil acidification became serious. The major influencing factors included the related properties of soil itself and the environmental conditions outside the soil, i.e. no-balanced fertilization, acid rain and traditional fertilization, and so on.更多还原