Resources Science ›› 2019, Vol. 41 ›› Issue (2): 394-404.doi: 10.18402/resci.2019.02.17

• Orginal Article • Previous Articles     Next Articles

Coupling analysis between ridge direction and gully erosion of sloping cultivated lands in the Sancha River watershed

Cong GUAN1,2,3(), Shuwen ZHANG2(), Ranghu WANG4, Jiuchun YANG2, Shuping YUE5, Lingxue YU2, Wenjuan WANG6   

  1. 1. Collage of Earth Science, Jilin Uiversity, Changchun 130061, China
    2. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
    3. Changchun Institute of Technology, Changchun 130012, China
    4. Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China
    5. School of Geographical Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China
    6. College of Resources and Environmental Sciences, Henan University of Economics and Law, Zhengzhou 450046, China
  • Received:2018-06-26 Revised:2018-12-03 Online:2019-02-25 Published:2019-02-25

Abstract:

The initiation and development of gully erosion in the sloping farmland of black soil area are closely related to the tillage measures. Taking the Sancha River watershed in typical black soil area of Northeast China as the study area, this study used the high precision basic data provided by the geographical conditions information census to obtain the ridge direction of cultivated land and gully erosion data. The relationship between the gully density and intensity and the ridge direction angle in the cultivated land was quantitatively analyzed. Then we studied the coupling effect of the gully erosion in different ridge directions and topography. The results showed that: (1) There was an obvious trend of horizontal ridge tillage of sloping farmland; (2) The gully intensity of cultivated land was moderate in the study area; (3) The ridge angle of cultivated land was significantly negatively correlated with the gully erosion density and intensity. With the increase of the angle between contour line and ridge direction, the average gully density and intensity in sloping farmlands gradually decreased. The gully density and intensity in the horizontal ridge tillage were the largest. The linear fitting effect of ridge angle and gully density was the best, and the gully intensity was slightly worse; (4) The distribution of gullies in different ridge directions has obvious topographic differentiation characteristics. In the cultivated land where the elevation was more than 280 m, all ridge tillage cannot effectively resist the gully erosion; when slope gradient was greater than 15°, the gully intensity of cultivated land with contour ridge was the least, however, it was still higher than the gully intensity of cultivated land with every ridges on gentle slope; there was no significant difference in the effect of ridge directions on the area of the gullies on the shady slope.

Key words: geographical conditions information census, sloping cultivated lands, ridge direction, erosion gully, coupling analysis, typical black soil area in Northeast China, Sancha River watershed