Impact of the shrinking winter wheat sown area on agricultural water consumption in the Hebei Plain

doi:10.1007/s11442-014-1090-6

Abstract

Abstract:

This study firstly analyzed the shrinkage of winter wheat and the changes of cropping systems in the Hebei Plain from 1998 to 2010 based on the agricultural statistic data of 11 cities and meteorological data,including daily temperature,precipitation,water vapor,wind speed and minimum relative humidity data from 22 meteorological stations,and then calculated the water deficit and irrigation water resources required by different cropping systems,as well as the irrigation water resources conserved as a result of cropping system changes,using crop coefficient method and every ten-day effective precipitation estimation method. The results are as follows. 1) The sown areas of winter wheat in the 11 cities in the Hebei Plain all shrunk during the study period. The shrinkage rate was 16.07% and the total shrinkage area amounted to 49.62×10⁴ ha. The shrinkage was most serious in the Beijing-Tianjin-Tangshan metropolitan agglomerate,with a shrinkage rate of 47.23%. 2) The precipitation fill rate of winter wheat was only 20%-30%,while those of spring maize and summer maize both exceeded 50%. The irrigation water resources demanded by the winter wheat-summer maize double cropping system ranged from 400 mm to 530 mm,while those demanded by the spring maize single cropping system ranged only from 160 mm to 210 mm. 3) The water resources conserved as a result of the winter wheat sown area shrinkage during the study period were about 15.96×10⁸ m³/a,accounting for 27.85% of those provided for Beijing,Tianjin and Hebei by the first phase of the Mid-Route of the South-to-North Water Diversion Project.

Key words: irrigation water resources, winter wheat, sown area shrinkage, crop water consumption, Hebei Plain

WANG Xue, LI Xiubin, XIN Liangjie. Impact of the shrinking winter wheat sown area on agricultural water consumption in the Hebei Plain[J]., 2014, 24(2): 313-330.

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