Journal of Resources and Ecology ›› 2013, Vol. 4 ›› Issue (1): 43-49.DOI: 10.5814/j.issn.1674-764x.2013.01.006

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Causes and Restoration of Degraded Alpine Grassland in Northern Tibet

WANG Jingsheng1, ZHANG Xianzhou1, CHEN Baoxiong1, SHI Peili1, ZHANG Junlong2, SHEN Zhenxi1, TAO Jian1, WU Jianshuang1   

  1. 1 Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2 School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China.
  • Received:2012-08-13 Revised:2012-11-19 Online:2013-03-30 Published:2013-03-26
  • Supported by:

    The Key Technologies Research and Development Program of China (2011BAC09B03), Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA05060700), and the ‘Western Light’ talents training program of Chiese Academy of Sciecnes.

Abstract: Grassland in northern Tibet plays an important role in the eco-security of the Qinghai-Tibet Plateau and the restoration of deserted and degraded grassland is now a focus for governments. We used remote sensing, simulations and field surveys to analyze the current status, trends and causes of grassland degradation across northern Tibet. We develop several recovery models for degraded grassland based on field experiments in the region. We found that slightly degraded grassland covers 62% and that moderate to severely degraded grassland occupied 15.1% in the Chang Tang Plateau. The amount of degraded alpine steppe increased from 1991, and the amount of area classified as severely degraded increased sharply from 2000. The cause of degraded steppe in northwestern Tibet may be the result of warming and an arid climate; the cause of severe degradation in mid and eastern regions was mainly from overgrazing. Three restoration models are proposed for different levels of degradation: “enclosures” for slightly degraded areas, “enclosures with fertilization” for moderately degraded areas, and “enclosure with oversowing and fertilization” for severely degraded areas.

Key words: Chang Tang Plateau, steppe degradation, driving force, restoration models, grassland