| Cite this article: | 肖盛杨.土地利用方式对喀斯特峡谷区土壤水稳性团聚体的影响[J].灌溉排水学报,0,():-. |
| xiaoshengyang.土地利用方式对喀斯特峡谷区土壤水稳性团聚体的影响[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Effects of soil water-stable aggregates under different land-use patterns on Karst canyon region |
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xiaoshengyang
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Institute of Mountain Resources of Guizhou Province
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| Abstract: |
| 【Objective】In order to provide a theoretical basis for the comprehensive evaluation of the impact of land use on soil structure degradation in Karst Canyon region.【Method】The method of space instead of time was used to study the distribution characteristics and stability of soil water stable aggregates under different land use patterns.【Result】The results showed that the aggregate particle size of the four land use types was mainly＞0.25 mm, and their content changes, MWD and GMD were as follows: intercrop between forest and grass > barren grassland > returning farmland to grassland > cultivated land, FD value was opposite. In different soil layers，with the decrease of particle size, the content of soil water stable aggregates in different land-use patterns increased first, then decreased and then increased. The content distribution and stability difference of water stable aggregates in each particle class of soil have a certain significant correlation of the 0~20cm soil layer, but the difference in 20cm ~ parent material layer was not significant. In the process of soil aggregation from micro aggregate (< 0.25 mm) to large aggregate (> 5 mm), 5 mm particle size becomes the critical point. GMD can be used as an index for evaluating the stability of water-stable aggregates in the surface soil and the entire profile of the Karst canyon.【Conclusion】The intercrop between forest and grass model can enhance the stability of soil structure in Karst canyon region and play an important role in preventing soil structure degradation. |
| Key words: land-uses; water-stable aggregates; the stability indexes; karst canyon region |
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