Journal of Geographical Sciences ›› 2019, Vol. 29 ›› Issue (6): 891-908.doi: 10.1007/s11442-019-1635-9

• Special Issue: Water Resources in Beijing-Tianjin-Hebei Region • Previous Articles     Next Articles

Change of winter wheat planting area and its impacts on groundwater depletion in the North China Plain

Xifang WU1,2, Yongqing QI2*(), Yanjun SHEN2, Wei YANG3, Yucui ZHANG2, Akihiko KONDOH3   

  1. 1. Graduate School of Science and Engineering, Chiba University, Chiba 2638522, Japan
    2. Key Laboratory of Agricultural Water Resources, Hebei Key Laboratory of Water-Saving Agriculture, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, CAS, Shijiazhuang 050021, China
    3. Center for Environmental Remote Sensing, Chiba University, Chiba 2638522, Japan
  • Received:2018-05-12 Accepted:2018-11-23 Online:2019-06-25 Published:2019-07-25
  • About author:

    Author: Wu Xifang, PhD Candidate, specialized in agricultural water consumption and water footprint assessment.E-mail: chibawxf2016@gmail.com

  • Supported by:
    National Natural Science Foundation of China, No.41471027;National Key Research and Development Plan, No.2016YFC0401403

Abstract:

The North China Plain is one of the most water-stressed areas in China. Irrigation of winter wheat mainly utilizes groundwater resources, which has resulted in severe environmental problems. Accurate estimation of crop water consumption and net irrigation water consumption is crucial to guarantee the management of agricultural water resources. An actual crop evapotranspiration (ET) estimation model was proposed, by combining FAO Penman-Monteith method with remote sensing data. The planting area of winter wheat has a significant impact on water consumption; therefore, the planting area was also retrieved. The estimated ET showed good agreement with field-observed ET at four stations. The average relative bias and root mean square error (RMSE) for ET estimation were -2.2% and 25.5 mm, respectively. The results showed the planting area and water consumption of winter wheat had a decreasing trend in the Northern Hebei Plain (N-HBP) and Southern Hebei Plain (S-HBP). Moreover, in these two regions, there was a significant negative correlation between accumulated net irrigation water consumption and groundwater table. The total net irrigation water consumption in the N-HBP and S-HBP accounted for 12.9×109 m3 and 31.9×109 m3 during 2001-2016, respectively. Before and after 2001, the decline rate of groundwater table had a decreasing trend, as did the planting area of winter wheat in the N-HBP and S-HBP. The decrease of winter wheat planting area alleviated the decline of groundwater table in these two regions while the total net irrigation water consumption was both up to 28.5×109 m3 during 2001-2016 in the Northwestern Shandong Plain (NW-SDP) and Northern Henan Plain (N-HNP). In these two regions, there was no significant correlation between accumulated net irrigation water consumption and groundwater table. The Yellow River was able to supply irrigation and the groundwater table had no significant declining trend.

Key words: North China Plain, planting area, winter wheat, remote sensing, net irrigation water consumption