Acta Geographica Sinica ›› 2011, Vol. 66 ›› Issue (5): 589-598.doi: 10.11821/xb201105002

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Patterns of Evapotranspiration and GPP and Their Responses to Climate Variations over the North China Plain

MO Xingguo, LIU Suxia, LIN Zhonghui, QIU Jianxiu   

  1. Key Lab. of Water Cycle & Related Land Surface Processes, Institute of Geographic Sciences & Natural Resources Research, CAS, Beijing 100101, China
  • Received:2011-01-06 Revised:2011-03-13 Online:2011-05-20 Published:2011-05-20
  • Supported by:

    National Basic Research Program of China, No.2010CB428404; International Cooperation Project, No.0911; National Natural Science Foundation of China, No.41071024

Abstract: Insufficient water resources is a major constraint on sustainable development of agriculture and socio-economy, and an imminent threat to national food security. Present situation attached particular importance to assurance of water supply for agriculture and ecology, which was on the basis of effective predication for regional evapotranspiration and water use efficiency (WUE). In this paper, an evapotranspiration and gross primary production (GPP) model based on vegetation index from Terra-MODIS was developed, and evapotranspiration and GPP in the North China Plain (NCP) during the period 2000-2009 were simulated. Results indicated that longitudinal trend was noticeable for both evapotranspiration and GPP distribution, especially in winter wheat growing season. With respect to water balance, it is concluded that regions with higher evapotranspiration than precipitation were mainly distributed to the north of the Yellow River, while the southern NCP showed a rainfall surplus. Affected and regulated by both climatic fluctuation and dynamic response of vegetation, both evapotranspiration and GPP illustrated considerable inter-annual variation. The research results can provide guidance to assessment of water consumption for ecological environment and water use efficacy.

Key words: North China Plain, climate, vegetation index, evapotranspiration, gross primary production