JOURNAL OF NATURAL RESOURCES ›› 2002, Vol. 17 ›› Issue (4): 430-437.doi: 10.11849/zrzyxb.2002.04.006

• Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS • Previous Articles     Next Articles

Eco-environmental rehabilitation and spatial differentiation based on enlarging terrace and de-farming in the loess hilly-gully region

XU Yong1, TIAN Jun-liang2, SHEN Hong-quan1   

  1. 1. Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;
    2. Institute of Soil and Water Conservation,CAS,Yangling712100,China
  • Received:2001-11-22 Revised:2002-03-20 Online:2002-08-25 Published:2002-08-25

Abstract: Based on research achievements in the past ten years and the successful experience of Yangou watershed demonstruction project in the loess hilly-gully region,as well as the characteristics of eco-environment al rehabilitation pattern of"enlarging terrace and de-farming",the areas of proposed reterraced fields,expanded graden plots and revegetated grass and forest as well as the amount of required investment on county(city,prefecture)level were calculated.With the aid of basic farmland enlargement index,garden plot expansion index,revegetated grass and forest index as well as investment demand density in dex,55counties of the loess hilly-gully region were classified into different categories,and their spatial differentiation characteristics were respectively analyzed.The following results are drawn as:(1)The area of newly built terraced fields needs to be is69.16×10 4 ha,expanded garden plots,79.2×10 4 ha,rehabilitated vegetation cover,541.02×10 4 ha,and total investment required,15.82billion yuan(RMB).Of which the enlarged terraces,expanded garden plots and rehabilitat-ed vegetation will need6.743,3.315and5.762billion yuan respectively.(2)There are two key eco-environmental rehabilitated areas in the loess hilly-gully region.The one is located in the contiguous areas between the northern Shaanxi province and the north-western Shanxi province,and the other is situated at the eastern Gansu province and the south-ern Ningxia autonomous region.(3)Regional policies adapted to different categories should be worked out as soon as possi-ble and the limited fund should be centralized in the two key areas of the loess hilly-gully re-gion.

Key words: eco-environmental rehabilitation, enlarging terrace and de-farming, spatial differen-tiation, loess hilly-gully region