Quantificational Analysis on Eco-water Requirement of Plant-Soil Compound Ecosystem Based on GIS:A Case Study of Yan'an Region in Northwest China

  • College of Tourism and Environmental Sciences, Shaanxi Normal University, Xi'an 710062, China

Received date: 2006-01-12

  Revised date: 2006-03-02

  Online published: 2006-07-25

Supported by

National Natural Science Foundation of China, No.40371003; Innovation Foundation of Shaanxi Normal University


Although water has the central function of the bloodstream in the biosphere, especially in arid or semi-arid regions such as Yan'an region in Northwest China, yet very limited attention is paid to the role of the water-related processes in ecosystem. In this research, based on continuous 30-year weather condition report data and 10-year soil water content data in Yan'an region, using experiment models and field tests combined with GIS spatial analysis, a comparatively accurate method for measuring the minimum, moderate and maximum eco-water requirements of plant-soil compound ecosystem has been put forward. Additionally, the changing characters of eco-water requirement or scarcity have been addressed from spatio-temporal dimensions. The results show that: (1) The minimum eco-water requirement of plant-soil compound ecosystem in the study area is 21.6185 billion m3, and the corresponding scarcity is 2.3556 billion m3. (2) The landscapes presenting severe eco-water scarcity are conifer and broad-leaved mixed forest-loam, conifer-loam as well as deciduous and broad-leaved mixed forest-cohesive loam etc. The landscapes presenting eco-water budget balance are shrubby grass-cohesive loam, shrub-cohesive soil as well as grassland-sandy loam; and the landscapes presenting slight eco-water surplus are crop-cohesive loam, crop-sandy loam as well as crop-sand and gravel loam. (3) The areas with relative serious eco-water scarce problem are mainly located in the southwestern and central parts of Yan'an region on the hilly-gullied Loess Plateau, concentrating in summer or early autumn of the year.

Cite this article

WANG Lixia, REN Zhiyuan . Quantificational Analysis on Eco-water Requirement of Plant-Soil Compound Ecosystem Based on GIS:A Case Study of Yan'an Region in Northwest China[J]. Acta Geographica Sinica, 2006 , 61(7) : 763 -770 . DOI: 10.11821/xb200607010


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