Acta Geographica Sinica ›› 2004, Vol. 59 ›› Issue (4): 621-628.doi: 10.11821/xb200404017

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The Evaluating Method of Eco-environment Restoration Patterns: A Case Study of the Loess Hilly-gully Region

XU Yong1, TIAN Junliang2, SHAN Hongquan1, LIU Puling2   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Institute of Soil and Water Conservation Research, CAS, Yangling Shaanxi 712100, China
  • Received:2003-11-10 Revised:2004-03-22 Online:2004-07-25 Published:2010-09-09
  • Supported by:

    National Natural Science Foundation of China, No.40371051; Knowledge Innovation Project of CAS, No.KZCX1-6-2-6

Abstract:

The eco-environment restoration pattern means an integration of the policies and their matching measures in regulating the relation between human being and environment in the eco-environmentally fragile areas. This paper discussed the contents, indices and methods of the pattern evaluation. And then, based on the research results in the past ten years and the successful cases of small watersheds in the loess hilly-gully region, the characteristics of eco-environment restoration patterns including "relieving and de-farming" (RD), "rebuilding terrace and de-farming" (RTD) and "dam system and permanent control" (DSPC) were summarized. The sizes of de-farming slope farmland, rebuilding terrace, enlarging garden plot and restoring vegetation were calculated, the investment demands of eco-environment restoration on three patterns were done, benefits from those patterns were analyzed respectively and compared among each other. As a result, this paper drew the following conclusions: (1) RD pattern showed that the area of de-farming slope farmland more than 25o is 41.91×104 hm2 with 44.01×108 yuan (RMB) of policy allowance, and that of de-farming slope farmland more than 15o is 125.53×104 hm2 with 131.82×108 yuan of that. The result of RTD pattern is that the area of enlarged terraces is 69.16×104 hm2 and that of restored vegetation is 541.02×104 hm2, with 125.05×108 yuan of total investment demand. And the data from DSPC pattern included 36×104 silt-covered dams, 55.98×104 hm2 of silt-covered farmland and 554.2×104 hm2 of new woodland or grassplot, and 221.22×108 yuan of investment demand. (2) The benefit analysis of three patterns and their comparison results showed that RTD pattern ranks the first, with appropriate investment demand, better benefit and safer food supplies. Compared with RTD, RD being underway at present is a transitional pattern, with lower benefit and unsafe food supplies, and it should be replaced with RTD as soon as possible. On account of the limitation of its bigger investment demand and more uncertain factors, DSPC can be only regarded as an accessorial pattern, in despite of its profit prior to that of RTD.

Key words: eco-environment restoration pattern, evaluating method, loess hilly-gully region