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[1]LIANG Zhanqi,LI Jinrong,GUO Jianying,et al.Effects of Returning Farmland to Forest Construction on Soil Erosion—A Case Study of Ansai County[J].Research of Soil and Water Conservation,2016,23(03):77-81.

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Effects of Returning Farmland to Forest Construction on Soil Erosion—A Case Study of Ansai County

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 03 Page number: 77-81 Column: Public date: 2016-06-28

Title:: Effects of Returning Farmland to Forest Construction on Soil Erosion—A Case Study of Ansai County

Author(s):: LIANG Zhanqi¹, LI Jinrong¹, GUO Jianying¹, XING Ende¹, LIU Yanping¹, SHAN Dan¹, HOU Xuetong²; 1. Institute of Water Resources for Pastoral Area, Ministry of Water Resources, Hohhot 010020, China;
2. Waterworks Authority of Dengkou County, Dengkou, Inner Mongolia 015200, China

Keywords:: returning farmland to forest; soil erosion; Ansai County; RUSLE

CLC:: S157

DOI:: -

Abstract:: Selecting the typical loess hilly-gully region returning farmland to forest County as the research example, based on 3S technology and the soil erosion RUSLE model, we analyzed and evaluated loess soil erosion change before and after returning farmland to forest loess plateau zones on the county scale. The results showed that compared with the former farmland in 1999, soil erosion intensity obviously changed on the spacial scale in 2010, on the whole, the soil erosion intensity decreased significantly. Extremely strong erosion decreased most (13.73% decline), shift of very strong erosion mainly to strongly accounted for 10.45%. Moderate erosion increased from 35.92% to 59.98%, which was transferred from the strong erosion, accounting for 27.08%. Slight and mild erosion changes were small. The enhanced area and weakened area of soil erosion were observed, and the overall trend of erosion density was declining. The transfer of moderate erosion to strong, and very strong erosion occurred in strengthened erosion area, but transferred area was small; enhanced area was mainly dominated by grassland coverage; the second one was the farmland converted to forestland and grassland, and bare patch appeared in some parts with the increased intensity of soil erosion. The transfer of strong erosion to moderate, and very strong erosion to strong erosion occurred in weakened erosion areas. The areas was grassland with low coverage, channel, and bare land of channel gully edge. With the implementation of Grain for Green Project, grass coverage increased in the former barren land, rainfall is trapped by vegetation and infiltrates in soil. Plants play the roles in mitigating peak flow and reducing channel erosion,which makes the soil erosion intensity decrease. After the implementation of 11-year Ansai County Forest, soil erosion intensity changed from the strong erosion (46.47%) to moderate erosion (59.98%), the average soil erosion in the county changed form 9 780 t/(km²·a) in 1998 into 5 460 t/(km²·a) in 2010, the annual reducing soil erosion was 12.74 million t. Returning farmland to forest construction played an important role in the control of soil erosion and improvement of ecological environment. These results will provide reference for soil erosion control in this region.

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