Biodiv Sci ›› 2018, Vol. 26 ›› Issue (2): 149-157.DOI: 10.17520/biods.2017196

• Orginal Article • Previous Articles     Next Articles

Conservation outcomes assessment of Sanjiangyuan alpine grassland with MODIS-EVI approach

Ruiling Song1, Hao Wang1,*(), Di Zhang1, Zhi Lü1,2, Ziyun Zhu1,2, Lu Zhang1, Yanlin Liu1,3, gongbao Caiwen2, Lan Wu1   

  1. 1 Center for Nature and Society, School of Life Sciences, Peking University, Beijing 100871
    2 Shanshui Conservation Center, Beijing 100871
    3 Institute of Forestry Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091
  • Received:2017-07-04 Accepted:2018-01-18 Online:2018-02-20 Published:2018-05-05
  • Contact: Wang Hao
  • About author:# Co-first authors

Abstract:

The Sanjiangyuan Region is a priority area for ecosystem conservation in China. Since 2005, the government has contributed significant funding to implement ecological conservation and restoration to protect and restore the grasslands. This study correlated aboveground biomass (AGB) data from 248 sites scattered across the Sanjiangyuan Region with MODIS Enhanced Vegetation Index (EVI) data from 2000 to 2016 and utilized four regression models to estimate AGB by EVI. Results showed that power-function model worked best for grasslands in the Sanjiangyuan Region. Trend analysis showed no significant trends in 62% of the area of Sanjiangyuan, with 22% of the area, mainly distributed in the western and northern regions, increasing significantly and 16% of the area, sporadically located in the central and southern regions, decreasing significantly from 2000 to 2016. In general, the AGB of the entire area showed no significant increases or decreases with high annual fluctuations since 2000. However, there have been significant decreases since 2012. The AGB inside of the Sanjiangyuan Nature Reserve was lower than that found outside, and didn’t increase significantly during first-stage projects between 2005 and 2012, based on results from matching methods.

http://jtp.cnki.net/bilingual/detail/html/SWDY201802005

Key words: Sanjiangyuan Region, rangelands degradation, effectiveness assessment, nature reserve, biomass, MODIS-EVI