论文部分内容阅读
为探讨石漠化等级对土壤养分贮量与经济价值的影响,以贵州省金沙县喀斯特山区无石漠化农耕地(Ⅰ)为对照,在研究潜在(Ⅱ)、轻度(Ⅲ)、中度(Ⅳ)、重度(Ⅴ)石漠化土壤养分含量变化的基础上,采用土壤养分库贮量计算方法和价值替代法计算评估了不同石漠化等级下土壤养分贮量及其潜在价值。结果表明:(1)0～40cm土层有机质、全氮、水解氮、全磷、有效磷、全钾、速效钾含量分别为32.31～104.12g/kg、1.35～2.87g/kg、76.90～124.00mg/kg、0.49～1.12g/kg、1.03～10.71mg/kg,12.25～26.22g/kg、114.35～245.35mg/kg;(2)土壤养分总贮量和有机质、全氮、全磷、全钾贮量依次为3.79～61.41t/hm2和2.55～48.56t/hm2、0.13～1.36t/hm2、0.04～0.52t/hm2、1.07～10.97t/hm2;(3)土壤养分总价值和有机质、全氮、全磷、全钾价值分别为0.86～9.80万元/hm2和0.08～1.55万元/hm2、0.29～3.08万元/hm2、0.04～0.53万元/hm2、0.45～4.64万元/hm2;(4)土壤养分贮量、价值均以Ⅰ最高,Ⅴ最低,随着石漠化程度加剧,土壤养分含量、贮量和价值均下降。
In order to explore the impact of rocky desertification levels on soil nutrient storage and economic value, a comparison was made between the non-rocky desertified farmland in Karst mountainous region of Guizhou Province (Ⅰ) and the potential (Ⅱ), mild (Ⅲ) (Ⅳ) and severe (Ⅴ) rocky desertification, the soil nutrient storage and its potential value under different levels of rocky desertification were calculated by the method of soil nutrient storage and the method of value replacement. The results showed that: (1) The content of organic matter, total nitrogen, hydrolyzed nitrogen, total phosphorus, available phosphorus, total potassium and available potassium in 0-40 cm soil layer were 32.31 ~ 104.12g / kg, 1.35 ~ 2.87g / kg and 76.90 ~ 124.00 total organic matter, total nitrogen, total phosphorus, total nitrogen, total phosphorus, total phosphorus, Potassium storage was 3.79 ~ 61.41t / hm2 and 2.55 ~ 48.56t / hm2, 0.13 ~ 1.36t / hm2, 0.04 ~ 0.52t / hm2 and 1.07 ~ 10.97t / hm2, respectively. (3) The total value of soil nutrients and organic matter, Total nitrogen, total phosphorus, total potassium values were 0.86 ~ 980 yuan / hm2 and 0.08 ~ 15.5 yuan / hm2, 0.29 ~ 30,800 yuan / hm2, 0,04 ~ 05,300 yuan / hm2, 0.45 ~ 46,400 yuan / hm2 ; (4) Soil nutrient storage, the value of the highest Ⅰ, Ⅴ the lowest, with the degree of rocky desertification aggravating, soil nutrient content, storage and value decreased.