广西石漠化地区环境因子对土壤肥力的影响研究

Effects of Environmental Factors on Soil Fertility in Rocky Desertification Area of Guangxi

以广西17个典型岩溶地貌县域的石漠化区域土壤为研究对象,采用野外取样调查和实验室检测分析方法,研究石漠化区域环境因子植被覆盖度、坡度、坡位对土壤肥力的影响。结果表明:土壤水解氮、速效磷和有机质随植被覆盖度增加而增加;坡度增加不利于有机质积累;坡位越低,土壤肥力各项指标越高。建议在坡度陡、坡位高的地方种植浅根性或攀爬类植物或农作物,增加植被覆盖度以提高土壤肥力,改善石漠化状况。

The effects of environmental factors such as vegetation coverage,slope,slope position on soil fertility were analyzed by means of field sampling and laboratory testing based on the soils of 17 typical counties in rocky desertification area of Guangxi.The results showed that soil hydrolyzed nitrogen,available phosphorus,and organic matter increased with the increase of vegetation coverage;the increase in slope was not conducive to the accumulation of organic matter;the lower the slope,the higher the various indicators of soil fertility.This paper suggested that shallow root types or climbing plants or crops should be planted on steep slopes and high slopes to increase vegetation coverage to improve soil fertility and improve environment of rocky desertification.