JOURNAL OF NATURAL RESOURCES ›› 2019, Vol. 34 ›› Issue (2): 385-399.doi: 10.31497/zrzyxb.20190214

• Resource Evaluation • Previous Articles     Next Articles

Spatio-temporal variation of farmland-fruit forest conversion and its enlightenment in Three Gorges Reservoir area: A case study on Caotangxi watershed

LIANG Xin-yuan1(), LI Yang-bing1,2()   

  1. 1. School of Geography and Tourism, Chongqing Normal University, Chongqing 401331, China
    2. Key Laboratory of Surface Process and Environment Remote Sensing in the Three Gorges Reservoir Area, Chongqing 401331, China
  • Received:2018-10-22 Revised:2018-12-20 Online:2019-02-28 Published:2019-02-28
  • Contact: LI Yang-bing E-mail:liang_xiny@foxmail.com;li-yapin@sohu.com

Abstract:

The transformation of the function of sloping farmland, and the mechanism of this process are of great significance to studies on the future food security and ecological security in the Three Gorges Reservoir area (TGRA). This study, based on 0.51 m high resolution remote sensing image data, took the Caotangxi watershed as the study area. Combined with field investigation, we visualized the spatial shape of sloping farmland function transformation by analyzing the conversion of sloping farmland into economic fruit forest. Then we discussed the conversion of agricultural land use in the study area and revealed the internal mechanism of sloping farmland function transformation in the TGRA. Research showed that: (1) Around 2012, the focus of farmland-fruit forest conversion in Caotangxi watershed transferred from low altitude plain in the southwest to high altitude and sloping farmland covered areas in the northeast, with the 800-m elevation as the inflection point. And the change points are within the slope of 15°-30°. (2) The aggregation of the farmland-fruit forest conversion in the study area generally occurred at about 8.5 km characteristic scale, and the spatial distribution was more balanced with time. (3) The phenomenon of farmland-fruit forest conversion was closely related to human activities, and occurred mostly in the vicinity of rivers, roads and rural settlements. (4) The farmland-fruit forest conversion could be summed up as 6 change patterns on the micro and macro scales. Driven by social, economic and natural factors, the farmland-fruit forest conversion in the TGRA is essentially the sloping farmland function transformation, and the focus tended to be a win-win situation of economic and ecological benefits.

Key words: Three Gorges Reservoir area, farmland-fruit forest conversion, spatio-temporal variation, Caotangxi watershed, sloping farmland function transformation