[1]YUAN Xiaoliang,LI Junya,GE Le,et al.Effects of Different Land Use Patterns on Soil Aggregate Stability and Saturated Hydraulic Conductivity[J].Research of Soil and Water Conservation,2020,27(04):67-71,77.
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Effects of Different Land Use Patterns on Soil Aggregate Stability and Saturated Hydraulic Conductivity
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 04
Page number:
67-71,77
Column:
目次
Public date:
2020-06-20
- Title:
- Effects of Different Land Use Patterns on Soil Aggregate Stability and Saturated Hydraulic Conductivity
- Keywords:
- Danjiangkou reservoir area; soil aggregate; soil organic carbon; saturated hydraulic conductivity
- CLC:
- S152.4; S152.7+2; S153
- DOI:
- -
- Abstract:
- In order to analyze the aggregate stabilities and water conductivities of soils under different land use patterns in the Danjiangkou reservoir area of the South-to-North Water Diversion Project(middle route), and to reveal the effects of human activities on soil structure and hydraulic characteristics, three land use patterns including dry land, paddy fields and woodland in this area were studied. The composition of soil aggregates was determined by dry sieving to explore the relationships between soil aggregates, soil organic carbon and soil saturated water conductivity under different land use patterns. The results show that the mechanical stability of soil aggregates is the highest in dry land, followed by forest land, and the lowest in paddy field; the organic carbon content is the highest in the woodland, followed by the paddy field and the least in the dry land; the distributions of organic carbon in different particle size aggregates under different land use patterns are also different; the organic carbon content in aggregate with particle size <0.25 mm in dryland is the highest, and the distribution of soil organic carbon in paddy fields is relatively uniform; the organic carbon content mainly concentrates in agglomerates with a particle size of <1 mm in forestland; the saturated hydraulic conductivity decreases in the order: forest land>dry land>paddy field. Correlation analysis shows that there is significant positive correlation between saturated hydraulic conductivity and organic carbon content, but is not correlation between saturated hydraulic conductivities and the mechanical stabilities of aggregates. At the same time, soil MWD value and GMD value have the significant negative correlation with organic carbon content, indicating that soil organic carbon plays an important role in mechanical stability of aggregate and hydraulic conductivity of soil.
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Last Update:
2020-07-09