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Acta Geographica Sinica >

1998 , Vol. 53 >Issue 5: 439 - 442

DOI: https://doi.org/10.11821/xb199805007

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  • 1. Department of Geographical Science, Lanzhou University, Lanzhou 730000;
    2. State Key Laboratory of Arid Agricultural Ecology, Lanzhou University Lanzhou 730000

Received date: 1997-02-01

  Revised date: 1997-08-01

  Online published: 1998-09-15

Supported by

Supported by National Naural Science Foundation of China

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Liu Yong, Zhang Shenglei . [J]. Acta Geographica Sinica, 1998 , 53(5) : 439 -442 . DOI: 10.11821/xb199805007

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