GEOGRAPHICAL RESEARCH ›› 2019, Vol. 38 ›› Issue (12): 2913-2926.doi: 10.11821/dlyj020181234

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Effect of land use change on gully erosion in black soil region of Northeast China in the past 50 years: A case study in Kedong county

LI Maojuan1, LI Tianqi1, ZHU Lianqi1(), ZHANG Shuwen2, ZHU Wenbo1, ZHANG Jingjing1   

  1. 1. College of Environment and Planning, Henan University, Kaifeng 475004, China
    2. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
  • Received:2018-11-15 Revised:2019-01-14 Online:2019-12-20 Published:2019-12-25
  • Contact: ZHU Lianqi E-mail:lqzhu@henu.edu.cn

Abstract:

The black soil region of Northeast China is one of the most important grain producing areas in China. However, increasingly severe gully erosion has destroyed much farmland and reduced grain production. In this paper, a typical black soil region, located in Kedong county, Heilongjiang province of Northeast China, was chosen as the study area. Based on Corona imagery in 1965, SPOT 5 imagery in 2005 and Gaofen-1 imagery in 2015, the distributions of gullies in 1965, 2005 and 2015 were obtained by visual interpretation. Based on relief maps in 1954, MSS imagery in 1975 and Corona imagery in 1965, the land use data in 1965 were obtained. Based on TM imagery in 2005 and 2015, the land use data in 2005 and 2015 were obtained. Then by using erosion density as the main indicator, the change of erosion gully was analyzed from the perspective of land use change. The results revealed that the gully erosion in the study area deteriorated in the past 50 years. The area of severe erosion greatly increased and showed a contiguous development trend. The cultivated land was the most important type of land use in the study area, and gully erosion on the cultivated land was the most serious. With the increased gully erosion on cultivated land, grassland and construction land, forest land and unused land were constantly reclaimed. The gully density increased the most during the interchange between cultivated land and grassland. The gully density was still very high and changed greatly after cultivated land was returned to forest land and grassland in the short term. However, with the implementation of “returning farmland to forest” and the improvement of land use, the gully erosion is still developing, but it changed slower over the ten years. By analyzing gully density change in the process of land use conversion on different slopes from 2005 to 2015, we found that the development of gully erosion is prone to occur after the forest land, grassland and unused land are cultivated on higher slopes, and it is more difficult to manage gullies with higher slopes.

Key words: land use, gully density, black soil region of Northeast China, gully erosion