RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (06): 932-942.doi: 10.11870/cjlyzyyhj201606009

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SPATIO-TEMPORAL VARIATIONS OF SOIL CONSERVATION SERVICES IN THREE GORGES RESERVOIR AREA OF CHONGQING

LIU Rui1,2,3, ZHOU Li-lei1,2, PENG Yao1,2, JI Tao1,2, LI Jun1,2, ZHANG Hong1,2, DAI Ji-cai1,2   

  1. 1. Chongqing Key Laboratory of Earth Surface Processes and Environmental Remote Sensing in Three Gorges Reservoir Area, Chongqing Normal University, Chongqing 401331, China;
    2. Key Laboratory of GIS Application, Chongqing Normal University, Chongqing 401331, China;
    3. Shanghai Key Lab for Urban Ecological Processes and ECO-Restoration, East China Normal University, Shanghai 200062, China
  • Received:2015-04-20 Revised:2015-06-12 Online:2016-06-20
  • Supported by:
    National Natural Science Foundation of China (Grant No. 41271411);Special Foundation for Scientific Basic Research Program of China (Grant No. 2011FY110400);Foundation for Sci &Tech Research Project of Chongqing (Grant No. cstc2014jcyjA90012);Foundation of Chongqing Municipal Education Committee (Grant No. KJ130625);Open Foundation of SHUES

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Abstract: Soil conservation is considered to be an important part of ecosystem services, and is by far the greatest factor for reducing soil erosion, surface sediment and agricultural non-point source pollution. The aim of this study is to investigate the spatio-temporal variations of soil conservation in Three Gorges Reservoir Area of Chongqing, which is of great significance to national ecological security. Evaluation results of soil conservation services during 2000–2013 were analyzed by using the InVEST(Integrate Valuation of Ecosystem Sevices and Tradeoffs tool) model. We find that: (1) the annual average of soil conservation was 604.39 t/hm2·a with a remarkable variation, increasing gradually along the Yangtze River from west to east. Six counties in the eastern hinterland were the dominant area for soil conservation in Three Gorges Reservoir (about 56%), which was accord with the target of the ecological conservation and development areas of the Chongqing's five major functional areas. (2) For the past 14 years, the annual soil conservation changed significantly, and presented a downward trend overall. As national key ecological function areas and crucial ecological barrier of Yangtze basin, the eastern hinterland found remarkable declines in the average soil conservation. (3) The soil conservation services structured a clear pattern of vertical differentiation, followed a decrease-increase-decrease law along with the increase of elevation. Anthropogenic activities, especially the agricultural activity was the primary cause for the formation tendency. Meanwhile, the soil conservation services rose gradually with increasing gradient, yet the trend decreased. (4) Forest is absolutely one of the most important land cover for soil conservation, while the shrub forest achieved 675.01 t/hm2·a, slightly stronger than the arbor forest with 608.37 t/hm2·a. The terrace fields reached up to 741.97 t/hm2·a, which were much stronger than dry land with 504.84 t/hm2·a. Combining with the fact that soil conservation services were improved during the Grain for Green Project (2002–2008), The results show that it can significantly improve the soil conservation services and reduce soil loss by increasing the forest cover area. On the other hand, the implement of the terracing engineering can effectively prevent soil erosion and improve the ecological environment and agricultural conditions.

Key words: soil conservation, Three Gorges Reservoir Area of Chongqing, spatio-temporal variations, InVEST model

CLC Number: 

  • P964
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