JOURNAL OF NATURAL RESOURCES ›› 2016, Vol. 31 ›› Issue (4): 583-595.doi: 10.11849/zrzyxb.20131354

• Resource Evaluation • Previous Articles     Next Articles

Evaluation on Soil Erosion Effects Driven by Land Use Changes over Danjiang River Basin of Qinling Mountain

LI Ting, LIU Kang, MA Li-yang, BAO Yu-bin, WU Lei   

  1. College of Urban and Environmental Science, Northwest University, Xi’an 710127, China
  • Received:2013-12-10 Revised:2016-01-21 Online:2016-04-28 Published:2016-04-28
  • Supported by:
    Environmental Protection Administration Key Projects, No.STSN-05-27; Special Scientific Research Fund of Meteorological Public Welfare Profession of Forest, No.201304309

Abstract: Using ArcGIS 10.0 and InVEST Sediment Retention Model, we analyzed the temporal and spatial characteristics of land use change from 2000 to 2010 in Danjiang River Basin, and simulated the change rules of soil erosion and soil conservation under different land use patterns in different periods in order to explore the effect of land use and land cover change on soil erosion and soil conservation. The result indicates: Bare land reduced a large percentage of 90.18 (831.06 hm2) and mainly transferred to water body. Farmland reduced a large area of 5 197.24 hm2 (4.11%) mainly converted to shrubs and towns. The action of grain for green project has begun to show its effects. The reservation and recovery of wetland was particularly effective. During the last ten years, the tendency of soil erosion in this basin was slowing down, but the situation is still serious that most areas are in intensity degree or middle degree of erosion. Taking the feature of land transfer during the study period into consideration, the transition of plough to shrubs was the primary cause of alleviating soil erosion. On the contrary, the inversed transition of forest land, shrubs or grassland to plough was the mainly cause of intensification of soil erosion. The total actual soil conservation in the year of 2000 and 2010 was 5.35×108 and 5.47×108 t, respectively. The soil conservation of ecosystem had an improvement in the whole region because the woodland, which covered more than half of the study area, had stable quantity of soil conservation per unit area. The soil conservation function of ecosystem is a result of all factors. Ensuring a certain area of forest land, and arranging reasonable spatial distribution of grain for green project under artificial intervention are the prerequisites of preventing deterioration of large area soil erosion in Danjiang River Basin of Qinling Mountain. Meanwhile, attention should also be paid to the preservation of arable land.

Key words: Danjiang River Basin of Qinling Mountain, InVEST sediment retention model, land use change, soil conservation, soil erosion

CLC Number: 

  • S157