Acta Geographica Sinica ›› 2003, Vol. 58 ›› Issue (3): 372-380.doi: 10.11821/xb200303006

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Temporal and Spatial Pattern of Net Primary Production of Terrestrial Ecosystems in China

TAO Bo1, LI Kerang1, SHAO Xuemei1, CAO Mingkui2   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Department of Geography, University of Maryland, USA
  • Received:2002-07-28 Revised:2003-02-19 Online:2003-05-25 Published:2003-05-25
  • Supported by:

    Knowledge Innovation Project of IGSNRR, CAS, No.CXIOG-E01-02-04

Abstract:

In this study, we used a biogeochemical model that has been validated at regional and global scales to estimate the temporal and spatial variations of China's terrestrial NPP (Net Primary Productivity) and its responses to interannual climate variability in the period of 1981-1998. The results show that the average annual total NPP is about 3.09 Gt C/yr and average NPP is about 342 g C/m2. NPP exhibited an increasing trend during the study period by 0.32%/yr. In some ENSO years (e.g. 1982, 1986, and 1997) NPP decreased significantly, but the relationship between the ENSO cycle and NPP is complex due to the complex effects of monsoons and regional climatic variability. For example, in the ENSO years of 1993 and 1994, NPP did not show a clear decreasing trend, even increased with 0.12 Gt in 1994. At the national level, the precipitation is the key factor controlling the NPP variations and a weak correlation exists between NPP and temperature, but regional responses are different. Northeast China (R2 = 0.85,P < 0.01), Northwest China (R2 = 0.97, P < 0.01), Inner Mongolia (R22 = 0.97, P < 0.01), and North China (R2 = 0.96, P < 0.01) have significant correlation with precipitation. In South China, the middle and lower reaches of the Yangtze River, and Central China, the correlation is weak.

Key words: terrestrial ecosystem, NPP, interannual variations, climate change, China