SCIENTIA GEOGRAPHICA SINICA ›› 2006, Vol. 26 ›› Issue (2): 205-210.doi: 10.13249/j.cnki.sgs.2006.02.205

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DCCA Order Applied in Environment Explaining of Watershed Runoff on Loess Plateau

SUO An-Ning1,2, WANG Xi-Zhi3, HU Yu-Zhe2, XIONG Ying2, BI Xiao-Li2   

  1. 1. National Ocean Environment Monitor Center, Dalian Liaoning 116023;
    2. College of Life Science, Beijing Normal University, Beijing 100875;
    3. Department of Resources & Environments, Foshan University, Foshan , Guangdong 528000
  • Received:2004-11-24 Revised:2005-04-02 Online:2006-03-20 Published:2006-03-20

Abstract: Twelve watersheds were taken as sample plots, 12 runoff characteristics indices were taken as "species "and nine factors were taken as environment factors in Jinghe basin on Loess Plateau. Based on that, a DCCA was used to quantitatively analyze the environmental roles and their effects on the spatial patterns of runoff characteristics. The results are as follows: (1) The first three axes of DCCA order relate to degraded grass land area ratio, rainoff, precipitation intensity, vegetation index and average slope significantly. (2)The runoff characteristics change slowly with environmental gradient and the basin can be divided into five runoff regions based on this. They are north loess hilly region, middle-north loess gully region, middle fragmentary loess plateau region, south mountain region and transition region from mountain to loess gully. (3) Twelve runoff characteristics index show different importance in different regions. Sediment transport ratio and sediment content are the most important in the north loess hilly region and north gully region. Extremely variation of runoff and erosion modulus are main indices in the middle fragmentary loess plateau region. Runoff, the biggest runoff index, the biggest sediment transport index, variation of runoff, variation of sediment transport are very important in the transition region from mountain to loess gully, and runoff modulus, runoff depth and the biggest sediment content index are main indices in the south mountain region.

CLC Number: 

  • Q143