Journal of Geographical Sciences ›› 2011, Vol. 21 ›› Issue (4): 677-688.doi: 10.1007/s11442-011-0872-3

• Eco-environmental Studies • Previous Articles     Next Articles

Production potential and yield gaps of summer maize in the Beijing-Tianjin-Hebei Region

WANG Tao, LU Changhe, YU Bohua   

  1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • Received:2010-06-09 Revised:2010-08-25 Online:2011-08-15 Published:2011-08-05
  • Supported by:

    Knowledge Innovation Program of the Chinese Academy of Sciences, No.KZCX2-YW-421; National Natural Science Foundation of China, No.41071063

Abstract:

Crop potential productivity is a key index of scientifically appraising crop production and land population-supporting capacity. This study firstly simulated the potential and waterlimited yield of summer maize in the Beijing-Tianjin-Hebei (BTH) region using WOFOST model with meteorological data of 40 years, and then analyzed yield gaps between the actual and potential yield based on statistical data at county level. The potential and water-limited yield of summer maize in the BTH region is 6854-8789 kg/hm2 and 6434-8741 kg/hm2, and the weighted average for whole region is 7861 kg/hm2 and 7185 kg/hm2, respectively. The simulated yields gradually decrease from northeast to southwest with changes in climatic conditions particularly temperature and precipitation. Annual variation of potential yield is higher in the central and southern parts than the northeastern part. Compared to potential yield, the water-limited yield has higher coefficient of variation (CV), because of precipitation effects. The actual yield of summer maize was 2537-8730 kg/hm2, regionally averaged at 5582 kg/hm2, about 70% of the potential yield, implying that the region has room to increase the yield by improving crop management and irrigation systems.

Key words: WOFOST, summer maize, yield potential, yield gap, the Beijing-Tianjin-Hebei region