草海上游石漠化过程中土壤抗蚀性变化

发布时间：2018-11-16 19:32

【摘要】：以草海流域上游的石漠化区为研究对象,研究不同等级石漠化条件下土壤抗蚀能力的差异,利用空间代替时间的方法,探讨草海上游区石漠化过程中土壤抗蚀性变化规律,为当地石漠化治理和湿地保护提供参考。通过实地调研,采集不同石漠化程度区的土样并进行室内指标测定,利用主成分分析方法选取了10个土壤理化指标对样地土壤抗蚀能力进行评价。结果表明:(1)所选10项理化指标可以较为全面地综合评价不同石漠化程度土壤抗蚀能力,土壤团聚状况、分散率、分散系数、0.25mm水稳性团聚体含量、0.5mm水稳性团聚体含量、结构破坏率、0.05mm粉黏粒含量这7项可以作为评价的优选指标,有机质含量、0.001mm黏粒含量、土壤团聚度这3项指标次之。(2)无石漠化CK样地(2.19)轻度石漠化L样地(1.19)重度石漠化S1样地(0.85)中度石漠化M样地(-1.35)重度石漠化S2样地(-2.88),其中中度石漠化样地(M)和重度石漠化样地(S_2)为负值,其余均为正值,差异明显。在石漠化过程中土壤抗蚀能力总体呈下降趋势,但是在石漠化发展后期,土壤抗蚀能力反而会有上升的可能。
[Abstract]:Taking the rocky desertification area in the upper reaches of the Caohai River Basin as the research object, the difference of soil anti-erosion ability under different grade rocky desertification conditions was studied. The change law of soil erosion resistance in the process of rocky desertification in the upper reaches of Cao Hai River was discussed by the method of space instead of time. It provides reference for local rocky desertification control and wetland protection. Through field investigation, soil samples from different rocky desertification areas were collected and indoor indexes were determined. Ten soil physical and chemical indexes were selected by principal component analysis (PCA) to evaluate the soil erosion resistance. The results showed that: (1) the selected 10 physical and chemical indexes could comprehensively evaluate the soil erosion resistance, soil agglomeration, dispersion rate, dispersion coefficient and 0.25mm water stable aggregate content of different rocky desertification degree. The content of 0.5mm water stable aggregates, the destruction rate of structure and the content of 0.05mm powder clay can be used as the best selection index for evaluation, organic matter content, 0.001mm clay content, content of organic matter, content of 0.001mm clay, content of organic matter and content of 0.001mm clay. (2) the CK sample without rocky desertification (2.19); the L sample with mild rocky desertification (1.19); the S1 sample with severe rocky desertification (0.85); the M sample with moderate rocky desertification (-1.35) with severe rocky desertification. The S _ 2 sample of rocky desertification (-2.88), Among them, the (M) of the rocky desertification sample land and the severe rocky desertification sample land were negative, while the others were positive, the difference was obvious. In the process of rocky desertification, the ability of soil corrosion resistance decreased generally, but in the late stage of rocky desertification, the ability of soil corrosion resistance will increase.
【作者单位】：贵州大学林学院;息烽县林业绿化局;
【基金】：国家重点研发计划课题(2016YFC0502604) 国家自然科学资助项目(41671275,41461057) 贵州省应用基础重大专项课题(黔科合JZ字[2014]2002) 贵州省重大专项(黔科合重大专项字[2016]3022号)
【分类号】：S157

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