Science in China Series D: Earth Sciences

, Volume 50, Issue 1, pp 121–129 | Cite as

Study on vegetation ecological water requirement in Ejina Oasis

  • Zhao WenZhi 
  • Chang XueLi 
  • He ZhiBin 
  • Zhang ZhiHui 
Article

Abstract

The Ecological Water Requirement (EWR) of desert oasis is the amount of water required to maintain a normal growth of vegetation in the special ecosystems. In this study EWR of the Ejina desert oasis is estimated through the relational equation between normalized difference vegetation index (NDVI), productivity and transpiration coefficient, which was established by a combination of the RS, GIS, GPS techniques with the field measurements of productivity. The results show that about 1.53×108 m3 water would be needed to maintain the present state of the Ejina Oasis, and the ecological water requirement would amount to 3.49×108 m3 if the existing vegetation was restored to the highest productivity level at present. Considering the domestic water requirement, river delivery loss, oasis vegetation water consumption, farmland water demand, precipitation recharge, etc., the draw-off discharge of the Heihe River (at Longxin Mount) should be 1.93×108–2.23×108 m3 to maintain the present state of the Ejina Oasis, and 4.28×108–5.17×108 m3 to make the existing vegetation be restored to the highest productivity level at present.

Keywords

Ejina Oasis NDVI productivity pattern vegetation ecological water requirement 

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References

  1. 1.
    Kang E S, Cheng G D, Song K C, et al. Simulation of energy and water balance in Soil-Vegetation-Atmosphere Transfer system in the mountain area of Heihe River Basin at Hexi Corridor of northwest China. Sci China Ser D-Earth Sci, 2005, 48(5): 538–548CrossRefGoogle Scholar
  2. 2.
    Xia J, Sun X T, Feng H L. Challenge in the study of ecological water requirement in West China. China Wat Resour, 2003, 9: 57–60Google Scholar
  3. 3.
    Covich A P. Water and ecosystems. in: Gleick P H, ed. Water in Crisis. Oxford: Oxford University Press, 1993. 40–55.Google Scholar
  4. 4.
    Gleick P H. Water in crisis: paths to sustainable water use. Ecol Appl, 1996, 8: 571–579Google Scholar
  5. 5.
    Yang Z F, Cui B S, Liu J L, et al. Theory, Method and Practice of Eco-environmental Water Requirement (in Chinese). Beijing: Science Press, 2003Google Scholar
  6. 6.
    Yang Z F, Cui B S, Liu J L. Estimation methods to eco-environmental water requirements: Case study. Sci China Ser D-Earth Sci, 2005, 48(8): 1280–1292.CrossRefGoogle Scholar
  7. 7.
    Liu C M, Chen Y Q, Li L J, et al. Problems and Techniques in the Hydrological Research of China (in Chinese). Beijing: Science Press, 2001Google Scholar
  8. 8.
    Li L J, Zheng H X. Environmental and ecological water consumption of river systems in Haihe-Luanhe Basins. Acta Geogr Sin (in Chinese), 2000, 55: 496–500Google Scholar
  9. 9.
    Jia B Q, Xu Y Q. The conception of the eco-environmental water demand and its classification in arid land-taking Xinjiang as an example. Arid Land Geogr (in Chinese), 1998, 21: 8–12Google Scholar
  10. 10.
    Zhao W Z, Cheng G D. Review of several problems on the study of eco-hydrological processes in arid zones. Chin Sci Bull, 2002, 47: 353–360CrossRefGoogle Scholar
  11. 11.
    Wang R H, Song Y D, Fan Z L, et al. Estimation on ecological water demand amount in four sources and one main stream area of Tarim Basin. J Soil Wat Conserv (in Chinese), 2001, 15: 19–22Google Scholar
  12. 12.
    Chen Y N, Zhang X L, Zhu X M, et al. Analysis on the ecological benefits of the stream water conveyance to the dried-up river of the lower reaches of Tarim River, China. Sci China Ser D-Earth Sci, 2004, 47: 1053–1064CrossRefGoogle Scholar
  13. 13.
    Goodrich D C, Scot R, Qi J, et al. Seasonal estimates of riparian evapotranspiration using remote and in situ measurements. Agr Forest Meteorol, 2002, 105: 281–309CrossRefGoogle Scholar
  14. 14.
    Zhao W Z, Chang X L, He Z B. Responses of distribution pattern of desert riparian forests to hydrologic process in Ejina Oasis. Sci China Ser D-Earth Sci, 2004, 47(Supp.): 21–31CrossRefGoogle Scholar
  15. 15.
    Huang Z S, Shen W S. Plant-Water Relation and Drought Tolerance in arid Zone (in Chinese). Beijing: China Environment Science Press, 2000. 31–39Google Scholar
  16. 16.
    Sun R Y, Li B, Zhu G X, et al. General Ecology (in Chinese). Beijing: Higher Education Press, 1993. 41–48Google Scholar
  17. 17.
    Su P X, Zhang L X, Du M W, et al. Photosynthetic character and water use efficiency of different leaf shapes of Populus euphratica and their response to CO2 enrichment. Acta Phytoecol Sin (in Chinese), 2003, 27: 34–40Google Scholar
  18. 18.
    Cui S B. A Research on issues of water demand for ecological environment. Water Utilization of China (in Chinese), 2001, (8):71–74Google Scholar
  19. 19.
    Wang F, Wang H, Cheng M J, et al.. A study of ecological water requirements in Northwest China Part II: Application of remote sensing and GIS. J Nat Resour (in Chinese), 2002, 17: 129–137Google Scholar
  20. 20.
    Yang W, Wang E D, Chen C. Application of BP neural network to forecasting urban water demand. Res Sur Environ (in Chinese), 2003, 24: 217–22Google Scholar

Copyright information

© Science in China Press 2007

Authors and Affiliations

  • Zhao WenZhi 
    • 1
    • 2
  • Chang XueLi 
    • 3
  • He ZhiBin 
    • 1
    • 2
  • Zhang ZhiHui 
    • 1
    • 2
  1. 1.Laboratory of Watershed Hydrology and Ecology, Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhouChina
  2. 2.Linze Inland River Basin Comprehensive Research StationChinese Ecosystem Research NetworkLanzhouChina
  3. 3.Geography and Resource Management CollegeLudong UniversityYantaiChina

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