Journal of Geographical Sciences ›› 2017, Vol. 27 ›› Issue (6): 661-680.doi: 10.1007/s11442-017-1399-z

• Orginal Article • Previous Articles     Next Articles

Contributions of climate change and human activities to ET and GPP trends over North China Plain from 2000 to 2014

Xuejuan CHEN1,2,*(), Xingguo MO1,3(), Shi HU1, Suxia LIU1,3   

  1. 1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. College of Resources and Environment/Sino-Danish Center, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-08-17 Accepted:2016-12-06 Online:2017-06-10 Published:2017-09-13
  • Contact: Xuejuan CHEN E-mail:chenxj.14b@igsnrr.ac.cn;moxg@igsnrr.ac.cn
  • About author:

    Author: Chen Xuejuan (1991-), PhD Candidate, specialized in remote sensing and eco-hydrology. E-mail: chenxj.14b@igsnrr.ac.cn

    *Corresponding author: Mo Xingguo, Professor, specialized in climate and eco-hydrology. E-mail: moxg@igsnrr.ac.cn

  • Supported by:
    National Natural Science Foundation of China, No.41471026;National Key Research and Development Program of China, No.2016YFC0401402

Abstract:

Quantifying the contributions of climate change and human activities to ecosystem evapotranspiration (ET) and gross primary productivity (GPP) changes is important for adaptation assessment and sustainable development. Spatiotemporal patterns of ET and GPP were estimated from 2000 to 2014 over North China Plain (NCP) with a physical and remote sensing-based model. The contributions of climate change and human activities to ET and GPP trends were separated and quantified by the first difference de-trending method and multivariate regression. Results showed that annual ET and GPP increased weakly, with climate change and human activities contributing 0.188 mm yr-2 and 0.466 mm yr-2 to ET trend of 0.654 mm yr-2, and -1.321 g C m-2 yr-2 and 7.542 g C m-2 yr-2 to GPP trend of 6.221 g C m-2 yr-2, respectively. In cropland, the increasing trends mainly occurred in wheat growing stage; the contributions of climate change to wheat and maize were both negative. Precipitation and sunshine duration were the major climatic factors regulating ET and GPP trends. It is concluded that human activities are the main drivers to the long term tendencies of water consumption and gross primary productivity in the NCP.

Key words: evapotranspiration, gross primary production, contribution, process-based model, multi-regression, North China Plain