[1]CHEN Jing,CHEN Hai,ZHU Dayun,et al.Effects of Combined Governance Using Forest and Grass on Stability and Erosibility of Soil Aggregates in Rock Desertification Area[J].Research of Soil and Water Conservation,2020,27(04):1-7.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 04
Page number:
1-7
Column:
目次
Public date:
2020-06-20
- Title:
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Effects of Combined Governance Using Forest and Grass on Stability and Erosibility of Soil Aggregates in Rock Desertification Area
- Author(s):
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CHEN Jing, CHEN Hai, ZHU Dayun, CHEN Hu
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(Karst Research Institute/State Key Engineering Technology Research Center for Karst Rocky Desertification Rehabilitation, Guizhou Normal University, Guiyang 550001, China)
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- Keywords:
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soil aggregates; stability; erodibility; forest and grass allocation model; rock desertification governance
- CLC:
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S152.4
- DOI:
-
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- Abstract:
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Soil structure under forest-grass complex model in rocky desertification control area is an important index to measure the effect of ecological control of rocky desertification. To explore the effect of different forest and grass allocation methods on soil quality in rocky desertification governance, taking tree-grass complex model as research example, with natural shrub-grass land as control, soil aggregate stability under different forest and grassland allocations in rocky desertification areas was analyzed by using the parameters such as the rate of macro-aggregates, the percentage of aggregate destruction, the mean weight diameter(WMD), the geometric mean diameter(GMD)and the fractal dimension(D). The results show that planted forest and grass can increase the rate of macro-aggregates with mechanical stability and water stability and reduce the percentage of aggregate destruction effectively compared with natural shrub-grass land; MWD and GMD are higher, and the D value is lower in the forest-grassland and artificial grassland; the stability indices of soil aggregates in four typical forest and grassland allocation patterns decrease in the order: ASI forest grassland>ASI artificials hrub>ASI forest shrub>ASI artificial grassland, it is obvious that the soil aggregate structure in forest grassland is more stable. The results of erodibility analysis indicate that the soil erodibility K value is lower in the forest-grass compound model, and the influence of different forest grass configuration patterns on the K value has not reached a significant level. Correlation analysis finds that the aggregate content is linearly related to the soil aggregate diameter indices(WMD, GMD)and fractal dimension(D), but the correlation levels are quite different; the aggregates of 1, 2, 5 mm grain size are the critical points in the transformation process of shifting soil microaggregates to macroaggregates. The results show that the planted grassland is beneficial to enhance the stability of soil structure and reduce soil erosion, and is suitable for further implementation and promotion in this region.