三峡库区秭归县土壤退化综合评价

Evaluating the soil degradation in Zigui County of the Three-Gorge reservoir area

  • 摘要: 建立了土壤退化评价指标及其评价标准,并对三峡库区秭归县的土壤退化强度、类型与空间变化 进行了评价与分析。结果表明,秭归县土壤退化中紫色土、石灰土、黄棕壤和黄壤的退化较为严重。林荒地比耕地土壤退化严重。耕地中旱地比水田退化严重。秭归县土壤退化类型以薄层化、粗骨化、旱化和养分贫瘠化为主,其中养分贫瘠化又以缺K和缺P趋势明显。土壤退化因人们对土壤利用方式和强度的差异而存在着空间变异,秭归县位于长江两岸河谷地带的一些乡镇土壤养分退化较为严重,而远离此的高山区地带的一些乡镇土壤退化较轻。

     

    Abstract: Indexes and standards for evaluating soil degradation were set up,and the degree,type and spatial change of soil degradation were evaluated in Zigui County.The results show that the purple soil,limestone soil,yellow brown earth and yellow earth are degraded heavily.The degradation of forest and wasteland soil is heavier than that of farmland.The dryland is degraded more greatly than that of paddy soil.In the region,soil degradation mainly trends to form lamellar structure,skeleton,dryland and to decrease nutrient which is short of K and P obviously.As the types and intensities in soil utilization are different,soil degradation is different in spatial.Generally,the soil nutrient degradation is heavier in villages and towns near Yangtze River valley than in mountainous villages far away from the valley.

     

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