[1]LI Xiao,CHEN Chen,LIN Jie,et al.Effect of Erosion Intensity on Composition and Stability of Soil Aggregates in Rocky Mountain Area of Huaibei[J].Research of Soil and Water Conservation,2019,26(04):56-61,67.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 04
Page number:
56-61,67
Column:
Public date:
2019-06-11
- Title:
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Effect of Erosion Intensity on Composition and Stability of Soil Aggregates in Rocky Mountain Area of Huaibei
- Author(s):
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LI Xiao1, CHEN Chen1, LIN Jie1, ZHU Xi1, DONG Bo1, DING Mingming2
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1. Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological Restoration, Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing 210037, China;
2. Nanjing Water Conservancy Bureau, Nanjing 210036, China
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- Keywords:
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soil erosion; soil aggregates; erosion intensity; stability
- CLC:
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S714
- DOI:
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- Abstract:
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In order to better reveal the relationship between soil erosion and soil aggregate, this paper selects the small watershed of Dawushan as the study area, and takes the soil aggregate under four types of land use as the study object. The particle size composition and stability characteristics of soil aggregates in different land use patterns under different erosion intensities were analyzed. The results showed that: (1) the main soil aggregates in the study area were macroaggregates (> 0.25 mm), the proportion of which was more than 70%, which was lower than that of the similar reports, which indicated that the soil loss was serious in the study area. Soil and water conservation work needs to be further carried out. (2) with the increase of erosion intensity, > 2 mm aggregate content decreased, < 0.106 mm was just the opposite, 0.5~0.25 mm and 1~0.5 mm aggregate contents changed obviously. The results showed that the erosion process tended to destroy macroaggregates and increase the percentage content of microaggregates, and 0.5 mm was sensitive to erosion intensity transition. (3) the soil aggregate stability index R0.25 and MWD are negatively correlated with the erosion intensity, and the D value is positively correlated. Under severe erosion conditions, both MWD and R0.25 are minimum, and the D value is maximum, indicating that severe erosion will reduce the stability of soil aggregates. (4) under the same erosion intensity, compared with the other three types of land use, the values of R0.25 and MWD were higher and D values were smaller, which indicated that the structure of woodland was better, which was beneficial to the accumulation of aggregates and had high stability.