[1]WANG Yong,ZHANG Jianhui,ZHANG Zehong,et al.Impacts of Long-Term Upslope Tillage Systems on Soil Water-Stable Aggregates on a Steep Hillslope[J].Research of Soil and Water Conservation,2016,23(01):44-49.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
23
Number of periods:
2016 01
Page number:
44-49
Column:
Public date:
2016-02-28
- Title:
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Impacts of Long-Term Upslope Tillage Systems on Soil Water-Stable Aggregates on a Steep Hillslope
- Author(s):
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WANG Yong1,2, ZHANG Jianhui2, ZHANG Zehong2, JIA Lizhi2
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1. College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, Ya’an, Sichuan 625014, China;
2. Institute of Mountain Hazards and Environment, CAS, Chengdu 610041, China
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- Keywords:
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upslope tillage; soil redistribution; aggregate stability; percentage of aggregate destruction
- CLC:
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S152.4
- DOI:
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- Abstract:
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To enlarge our knowledge about the effects of tillage erosion on soil structure stability in different landscape positions for the hillslopes, traditional tillage and long-term upslope tillage were investigated by measuring and analyzing the characters of soil water-stable aggregates and soil organic carbon (SOC) contents to examine the impacts of soil redistribution by tillage (upslope and downslope tillage) on soil water-stable aggregate properties. The results showed that the mean weight diameter (MWD) value was lager by upslope tillage than downslope tillage at each slope position. After upslope tillage, significant increases (p < 0.05) of MWD by 31.94% and 23.54% occurred at the 1 m and 20 m slope positions, but there were slight increases by 0.87%,2.99%, and 3.03% at 5 m, 10 m, and 15 m slope positions, respectively, compared with downslope tillage. The results indicated that apparent changes in soil structural properties occurred close to the upslope and downslope boundaries of the field and the middle slope acted as a conveyor belt. Percentage of aggregate destruction (PAD) remarkably decreased by 25.29% after upslope tillage, implying that upslope tillage notably reduced in breakage of large aggregates (> 0.25 mm). This finding demonstrated that upslope tillage significantly decreased tillage erosion, and increased soil aggregate stability.