[1]WANG Xiangdong,DAI Quanhou,LI Cuilian,et al.Variation of Soil Anti-erodibility During Rocky Desertification in Upper Reaches of Caohai[J].Research of Soil and Water Conservation,2017,24(03):13-18,23.
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Variation of Soil Anti-erodibility During Rocky Desertification in Upper Reaches of Caohai
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
24
Number of periods:
2017 03
Page number:
13-18,23
Column:
Public date:
2017-06-28
- Title:
- Variation of Soil Anti-erodibility During Rocky Desertification in Upper Reaches of Caohai
- Keywords:
- pedology; soil anti-erodibility; principal component analysis; karst rocky desertification; Caohai
- CLC:
- S157
- DOI:
- -
- Abstract:
- We analyzed the differences between soil anti-erodibility under different rocky desertification conditions in karst rocky desertification region in upper reaches of Caohai. By using space instead of time, changes of soil anti-erodibility were investigated during rocky desertification in upper reaches of Caohai, aiming to provide reference for desertification control and wetland protection of Caohai. Soil samples from different karst rocky desertification level areas were taken according to field investigation. Soil physicochemical properties were tested in laboratory, and ten of them were selected to evaluate the soil anti-erodibility by principal component analysis with Spass 18.0. The results indicated that: (1) soil anti-erodibility under different rocky desertification conditions could be comprehensive evaluated by 10 indicators; the contents of silt/clay < 0.05 mm, reunion situation, dispersion rate, dispersion coefficient, water-stable aggregates > 0.25 mm, water-stable aggregates > 0.5 mm, structural damage rate were optimal indexes to evaluate soil anti-erodibility, and the indices organic matter, content of clay < 0.001 mm, reunion degree came next； (2) the order of anti-soil erosion degrees of different rocky desertification areas obtained by principal component analysis was: sample CK of non rocky desertification(2.19) > sample L of light rocky desertification(1.19) > sample S1 of intense rocky desertification(0.85) > sample M of moderate rocky desertification(-1.35) > sample S2 of intense rocky desertification(-2.88), the values of comprehensive anti-erodibility indexes of Sample M and Sample S2 were negative, others were positive, the differences were obvious. Soil anti-erodibility declined gradually during rocky desertification, but it could also increase in late stage of rocky desertification.
- References:
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