JOURNAL OF NATURAL RESOURCES ›› 2011, Vol. 26 ›› Issue (3): 419-428.doi: 10.11849/zrzyxb.2011.03.008

• Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS • Previous Articles     Next Articles

Ecological Capital Assessment for the Alpine Grassland Ecosystem in the Northwest Alpine Pastoral Area of Tibet

ZHU Wen-quan1, GAO Qing-zhu2, DUAN Min-jie2, GUO Ya-qi2, LI Yue2, WAN Yun-fan2, BIAN DUO3, WEI Lan-ting4   

  1. 1. State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Resources Science & Technology, Beijing Normal University, Beijing 100875, China;
    2. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    3. Tibetan Plateau Atmospheric Environmental Science Research Institute, Lhasa 850001, China;
    4. Nagqu Grassland Station, Tibet Autonomous Region, Nagqu 852100, China
  • Received:2010-02-02 Revised:2010-09-23 Online:2011-03-20 Published:2011-03-20

Abstract: This study computed the ecological capital over the northwest alpine pastoral area of Tibet (NWT) in 1992, 1995, 2000 and 2006, using the net primary productivity (NPP) and vegetation coverage derived from remote sensing data. The spatial and temporal pattern of ecological capital in the NWT was comprehensively analyzed. The results showed that the ecological capital of alpine grassland ecosystem decreased from southeast to northwest in the NWT. In terms of the composition of ecological capital, climate regulation and water conservation contributed the most part, with a percentage of 45% and 40%, respectively. Organic matter production contributed 11%, soil and fertilization conservation 2%, and nutrient cycling 2%. The ecological capital of alpine grassland ecosystem in the NWT was 61.61 billion yuan in 1992, and rose to 163.72 billion yuan in 2006. The mean ecological capital value per unit area has increased 10.6 thousand yuan/km2 annually from 1992 to 2006. In light of the data inconsistency from different remote sensors and the short time series in remote sensing data, the estimated changing trend in ecological capital may be higher than the actual one, and further investigations should be carried out to validate these results.

Key words: ecosystem service value, remote sensing monitoring, the northwest alpine pastoral area of Tibet

CLC Number: 

  • F062.2