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Study of alpine grass degradation in Northern Tibet based on analytical hierarchy process*(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2019 06
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Study of alpine grass degradation in Northern Tibet based on analytical hierarchy process*
 WANG Jinzhi12 YAN Liang12 WU Haidong12 & KANG Xiaoming12**
1Institute of Wetland Research, Chinese Academy of Forestry, Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China
2Sichuan Zoige Wetland Ecosystem Research Station , Tibetan Autonomous Prefecture of Aba 624500, China
alpine grassland vegetation coverage degradation analytical hierarchy process

Alpine grasslands in northern Tibet are claimed to be sensitive and vulnerable to climate change and human disturbance. It is a major livestock production center in Tibet and is facing the degradation problems in recent years. However, the magnitude of the relative influences of climatic and anthropogenic drivers are still unknown and under debate. Here, we analyzed the spatial and temporal distribution pattern of alpine grassland degradation/ restoration during 1 990-2 015 based on vegetation coverage, and used analytic hierarchy process (AHP) to reveal the relative contribution of different anthropogenic and natural factors to the degradation of grassland in northern Tibet Nagqu region . Results showed that t he degradation of alpine grassland in Nagqu showed a general trend of improvement during 1 990 - 2 015, and the proportion of degraded and restored grassland area in the total area was 35.83% and 64.17% respectively. Grassland vegetation severely degraded in Nagqu, Nierong and Baqing counties in the southeast of northern Tibet. Human factors such as overgrazing are the main factors leading to the degradation of alpine grassland in northern Tibet, and t he contribution rates of long-term overgrazing, rodents and pests, excessive digging of medicinal materials, road construction, and mineral exploitation to the degradation of grassland are 28.7%, 17.1% , 14.1%, 12.6% and 10.3%, respectively. In conclusions, the increasing human activities such as grazing in recent years , in?the?context?of?climate change, are the main reasons for the degradation of alpine grassland in northern Tibet Nagqu region, which provides a theoretical basis for grassland degradation recovery and management and decision-making of alpine grassland in the future.




Last Update: 2019-06-19