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FOREST RESOURCES WANAGEMENT ›› 2018, Vol. 0 ›› Issue (6): 90-98.doi: 10.13466/j.cnki.lyzygl.2018.06.015

• Scientific Research • Previous Articles     Next Articles

Changes of Soil Erosion in the Small Watershed of the Taqing River in Southern Yunnan Province in Recent 20 Years Based on GIS

SU Bude1(), ZHAO Yangyi1,2(), WANG Keqin1,2, DUAN Xu1,2, FANG Bin3   

  1. 1. College of Ecology & Soil and Water Conservation,Southwest Forestry University,Kunming 650224,China
    2. Yuxi Forest Ecosystem Research Station,National Forestry and Grassland Administration,Kunming 650224,China
    3. Yunnan Xiuchuan Environmental Engineering Technique Co,Ltd,Kunming 650021,China
  • Received:2018-09-25 Revised:2018-12-07 Online:2018-12-28 Published:2020-09-27
  • Contact: ZHAO Yangyi E-mail:2855865449@qq.com;yyz301@foxmail.com

Abstract:

Based on the geographic information system technology and the 2001,2007 and 2016 QuickBird image data of the small watershed,the RUSLE model was used to calculate the amount of soil erosion in 2001,2007 and 2016.Analysis was done on soil erosion changes under different land use types.The results show that the soil erosion intensity in the left river basin of the Taqing River is mild and moderate,accounting for 79.44%~80.55% of the total area.The area of tea land continued to increase,which was 137.92,146.46,180.84 hm2 respectively.The forest land accounts for 60.04%~67.17% of the total area.The planting area of tea fields and cultivated land steep slopes has increased year by year and unreasonable reclamation has caused soil erosion in the basin to intensify.The difference in soil erosion between 2001 and 2016 was 44 133.38,46 600.56 and 44 856.95t/a,respectively.The soil erosion comprehensive index changes by about 5%.There is a coupling relationship between land use change and soil erosion.The change of tea land in the study area has little effect on the soil erosion in the basin.It is necessary to strengthen the corresponding soil and water conservation measures for the cultivated land in the basin.

Key words: soil erosion, geographic information system, southern Yunnan, small watershed, RUSLE model

CLC Number: