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作 者 ：傅伯杰,郭旭东,陈利顶,马克明,李俊然

期 刊 ：生态学报 2001年 21卷 6期 页码：926~931

关键词：土地利用变化；土壤养分；退耕还林还草；

Keywords:land use changes, soil nutrients, Northern China,

摘 要 ：土地利用变化可以引起土壤养分的变化。以河北省遵化县为例 ,研究该县 1 980年到 1 999年土地利用变化及土壤养分的变化。结果表明 ,近 2 0 a来 ,旱地、草地、水田面积大幅度减少 ,林地和村镇用地大幅度增加。旱地转换为林地 ,土壤有机质提高了 2 1 % ,全氮提高了 1 0 % ,碱解氮提高了 65% ,速效磷提高了 1 7% ,速效钾提高了 1 7%。旱地转换为草地 ,土壤有机质提高 3 8% ,全氮提高了 3 7% ,碱解氮提高了 71 % ,速效磷提高了 2 % ,速效钾提高了 2 8%。退耕还林还草不仅改变了土地覆被 ,而且提高了土壤养分。

Abstract:Land use Change is the results of interactions between physical factors and human activities.Land ues change may influence many natural phenomena and ecological processes,including soil nutrient and soil water change,runoff and soil erosion,biodiversity and biogeochemical cycle.Land use changes can results in land degradation,such as water and soil loss,land desertification.It also can control water and soil loss,land desertification,and improve soil quality.Since late 1970s,the new land policy “Household R...

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