论文部分内容阅读
为修复和恢复石漠化区的生态环境,对新邵县岩溶石漠化林地的土壤理化特性进行研究,并运用改进的内梅罗综合指数法,对石漠化林地的土壤肥力进行了综合评价。结果表明:石漠化土壤呈弱酸性,不同坡位和土层厚度的土壤容重、pH值、土壤有机质、土壤有效磷、土壤碱解氮没有显著差异,不同坡位的土壤速效钾没有显著差异,而不同土层厚度的土壤速效钾有极显著差异。不同坡位0～60 cm土层的土壤容重变异幅度为1.39～1.58 g/cm3,不同坡位0～60 cm土层的土壤有机质其变异幅度为6.47～7.40 g/kg,各坡位以0～20 cm土层的土壤速效钾含量最高,其变异幅度为73.75～111.25 mg/kg,不同坡位土壤碱解氮变异幅度为69.65～77.70 mg/kg。石漠化地上坡、中上坡及中下坡的土壤综合肥力为一般,而下坡的土壤综合肥力则为贫瘠。
In order to rehabilitate and restore the ecological environment in rocky desertification area, the physico-chemical properties of the soil in karst rocky desertification area of Xinshao County were studied, and the soil fertility of the rocky-desertified forest area was comprehensively analyzed by using the improved Nemero index method Evaluation. The results showed that the rocky desertification soil showed weak acidity, soil bulk density, pH value, soil organic matter, soil available phosphorus, and soil available nitrogen had no significant difference in different slope positions and soil thicknesses. Soil available potassium in different slope positions had no significant difference , While the soil available potassium of different soil thickness had extremely significant difference. Soil bulk density varied from 1.39 to 1.58 g / cm3 in 0 ~ 60 cm soil layer at different slope positions. The variation range of soil organic matter was 6.47 ~ 7.40 g / kg in 0 ~ 60 cm soil layer at different slope positions, Soil available potassium in the 20 cm soil layer was the highest with the range of 73.75-1111.25 mg / kg and the range of 69.65-77.70 mg / kg of soil available nitrogen at different slope positions. Soil rocky desertification uphill, uphill and downhill soil general fertility is general, while downhill soil fertility is barren.