Journal of Geographical Sciences ›› 2010, Vol. 20 ›› Issue (2): 193-204.doi: 10.1007/s11442-010-0193-y

• Vegetation Change • Previous Articles     Next Articles

Simulating net primary production of grasslands in northeastern Asia using MODIS data from 2000 to 2005

XING Xiaoxu1,2, XU Xingliang1, ZHANG Xianzhou1, ZHOU Caiping1, SONG Minghua1, SHAO Bin1, *OUYANG Hua1,3   

  1. 1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
    3. International Centre for Integrated Mountain Development, G.P.O. Box 3226, Khumaltar, Kathmandu, Nepal
  • Received:2009-01-21 Revised:2009-06-15 Online:2010-04-15 Published:2010-08-16
  • Contact: Ouyang Hua, Professor, E-mail: Ohua@igsnrr.ac.cn E-mail:Ohua@igsnrr.ac.cn
  • About author:Xing Xiaoxu, Ph.D, specialized in the study of pattern and process of land ecosystem. E-mail: xingxx0305@126.com
  • Supported by:

    Basic Research Project of the Ministry of Science and Technology, No.2007FY110300; National Basic Research Program of China, No.2005CB724801

Abstract:

The net primary production (NPP) of grasslands in northeastern Asia was estimated using improved CASA model with MODIS data distributed from 2000 and ground data as driving variables from 2000 to 2005. Average annual NPP was 146.05 g C m?2 yr?1 and average annual total NPP was 0.32 Pg C yr?1 in all grasslands during the period. It was shown that average annual grassland NPP in the whole northeastern Asia changed dramatically from 2000 to 2005, with the highest value of 174.80 g C m?2 yr?1 in 2005 and the lowest value of 125.65 g C m?2 yr?1 in 2001. On regional scale, average annual grassland NPP of 179.71 g C m?2 yr?1 in southeastern Russia was the highest among the three main grassland regions in the six years. Grasslands in northern China exhibited the highest average annual total NPP of 0.16 Pg C yr?1 and contributed 51.42% of the average annual total grassland NPP in northeastern Asia. Grassland NPP in northeastern Asia also showed a clear seasonal pattern with the highest NPP occurred in July every year. Average monthly grassland NPP in southeastern Russia was the highest from May to August while average monthly grassland NPP in northern China showed the highest NPP before May and after August. The change rate distribution of grassland NPP between the former three years and the latter three years showed grassland NPP changed slightly between the two stages in most regions, and that NPP change rate in 80.98% of northeastern Asia grasslands was between –0.2 and 0.2. Grassland NPP had close correlation with precipitation and temperature, that indicates climate change will influence the grassland NPP and thus have a great impact on domestic livestock in this region in future.

Key words: northeastern Asia, grassland, MODIS, CASA model, NPP 194 Journal of Geographical Sciences