Water requirements and stability of oasis ecosystem in arid region, China

This research was conducted to determine the water requirements of oasis ecosystem with crop evapotranspiration method, and to analyse the water balance between the supply and requirement using water balance model, and then assess the stability of oasis ecosystem in the middle of Heihe River basin, China. The results indicated that the summations of the water supply and requirement approximated to 82.54 and 110.13 Mm3 years−1 in 2007, and the water deficit was 27.59 Mm3 years−1. The farmland was the largest water consumer with a consumption of 57.07 Mm3 years−1 and accounted for 51.82% of the total water requirements. It was followed by the water area 38.83 Mm3 years−1, forestland 12.13 Mm3 years−1 and domestic and industrial 2.10 Mm3 years−1, and accounted for 35.26, 11.01 and 1.92%, respectively. The stability index was 0.74, which implies that the oasis ecosystem have already started degenerating in sub-stability state. However, the water requirement of unit area was 1243.70 mm years−1 and larger than other oases in arid region of China, which implies that the water resource scarcity do not exist in the middle basin where the excessive waste of the flood irrigation method has broken the balance between the water supply and requirement in the basin scale.

[1]  Suitable scale of Weigan River plain oasis , 2007 .

[2]  Peter H. Gleick,et al.  Regional hydrologic consequences of increases in atmospheric CO2 and other trace gases , 1987 .

[3]  Larry O. Pochop,et al.  Evaporation, Evapotranspiration and Climatic Data , 1994 .

[4]  B. Bouman,et al.  Exploring options to grow rice using less water in northern China using a modelling approach: I. Field experiments and model evaluation , 2007 .

[5]  T. Hata,et al.  Estimation of crop water requirements in arid region using Penman–Monteith equation with derived crop coefficients: a case study on Acala cotton in Sudan Gezira irrigated scheme , 2000 .

[6]  K. Tanji,et al.  Agricultural Drainage Water Management in Arid and Semi-Arid Areas , 2002 .

[7]  G. Luo,et al.  Stability of patches of oasis landscape in arid areas: A case study of Sangong River Watershed, Xinjiang, China , 2006 .

[8]  R. Allen,et al.  Evapotranspiration and Irrigation Water Requirements , 1990 .

[9]  Pradeep Kashyap,et al.  Evaluation of evapotranspiration estimation methods and development of crop-coefficients for potato crop in a sub-humid region , 2001 .

[10]  Ye Qi,et al.  Effects of climate variability on the carbon dioxide, water, and sensible heat fluxes above a ponderosa pine plantation in the Sierra Nevada (CA) , 2000 .

[11]  Martin Smith,et al.  The application of climatic data for planning and management of sustainable rainfed and irrigated crop production , 2000 .

[12]  Chen Dong.  Design of water resources accounts:a case of integrated environmental and economic accounting , 2003 .

[13]  R. K. Goyal.  Sensitivity of evapotranspiration to global warming: a case study of arid zone of Rajasthan (India) , 2004 .

[14]  Hubert H. G. Savenije,et al.  Water demand management: A case study of the Heihe River Basin in China , 2005 .

[15]  ShaoZhong Kang,et al.  Estimation of maize evapotranspiration under water deficits in a semiarid region , 2000 .

[16]  W. Zhong-jing.  Stability analysis of oasis in arid region , 2002 .

[17]  Shaozhong Kang,et al.  Crop coefficient and ratio of transpiration to evapotranspiration of winter wheat and maize in a semi-humid region , 2003 .

[18]  L. S. Pereira,et al.  Crop evapotranspiration : guidelines for computing crop water requirements , 1998 .

[19]  Zacharia Katambara,et al.  Decision support system for estimation of potential evapo-transpiration in Pangani Basin , 2003 .

[20]  Xin Li,et al.  Landscape evolution in the middle Heihe River Basin of north-west China during the last decade , 2003 .

[21]  Zhang Hong,et al.  A preliminary study of oasis evolution in the Tarim Basin, Xinjiang, China , 2003 .

[22]  Chris S. Renschler,et al.  Regionalisation concept for hydrological modelling on different scales using a physically based model: Results and evaluation , 1999 .

[23]  J. Cavero,et al.  Comparing Penman-Monteith and Priestley-Taylor approaches as reference-evapotranspiration inputs for modeling maize water-use under Mediterranean conditions , 2004 .

[24]  V. Caselles,et al.  A simplified equation to estimate spatial reference evaporation from remote sensing-based surface temperature and local meteorological data , 2004 .

[25]  Yongqiang Zhang,et al.  Determination of daily evaporation and evapotranspiration of winter wheat and maize by large-scale weighing lysimeter and micro-lysimeter , 2002 .

[26]  Richard G. Allen,et al.  Estimating Reference Evapotranspiration Under Inaccurate Data Conditions , 2002 .

[27]  Zhiqiang Zhang,et al.  Oasis land-use dynamics and its influence on the oasis environment in Xinjiang, China , 2004 .

[28]  David D. Tarkalson,et al.  Effect of irrigation amounts applied with subsurface drip irrigation on corn evapotranspiration, yield, water use efficiency, and dry matter production in a semiarid climate , 2008 .

[29]  Z. Xiaolei,et al.  Oasis System and Its Reasonable Development in Sangong River Watershed in North of the Tianshan Mountains,Xinjiang,China , 2006 .

[30]  J. Chao,et al.  Theory of stability, and regulation and control of ecological system in oasis , 2003 .

[31]  Wenzhi Zhao,et al.  Analysis of Water Resources Supply and Demand and Security of Water Resources Development in Irrigation Regions of the Middle Reaches of the Heihe River Basin, Northwest China , 2006 .

[32]  Yanjun Shen,et al.  Effects of irrigation on water balance, yield and WUE of winter wheat in the North China Plain , 2006 .

[33]  P. H. Gleick,et al.  Colorado river basin and climatic change. The sensitivity of streamflow and water supply to variations in temperature and precipitation , 1993 .

[34]  M. Beyazgül,et al.  Estimation methods for crop water requirements in the Gediz Basin of western Turkey. , 2000 .

[35]  P. Su,et al.  Ecological effects of desertification control and desertified land reclamation in an oasis–desert ecotone in an arid region: A case study in Hexi Corridor, northwest China , 2007 .

[36]  A. Dyer.  Measurements of evaporation and heat transfer in the lower atmosphere by an automatic eddy‐correlation technique , 1961 .

[37]  Yong-zhong Su,et al.  Sap flow and tree conductance of shelter-belt in arid region of China , 2006 .