JOURNAL OF NATURAL RESOURCES ›› 2018, Vol. 33 ›› Issue (3): 398-411.doi: 10.11849/zrzyxb.20170116

• Resource Ecology • Previous Articles     Next Articles

The Ecological Effects of Ecological Security Barrier Protection and Construction Project in Tibet Plateau

HUANG Lin, CAO Wei, XU Xin-liang, FAN Jiang-wen, WANG Jun-bang   

  1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • Received:2017-02-20 Revised:2017-03-17 Online:2018-03-20 Published:2018-03-20
  • Supported by:
    The National Key Research and Development Program, No. 2017YFC0506503; The Western Project Program of the Chinese Academy of Sciences, No. KZCX2-XB3-08-01.

Abstract: Tibet Plateau is an important ecological barrier of China. It is also the source region of many rivers and the gene bank of biological species. In order to protect the ecological function of Tibet Plateau, Ecological Security Barrier Protection and Construction Project was carried out in Tibet Plateau since 2008. Based on the objective of the project, this paper assessed the ecological effects of the Ecological Security Barrier Protection and Construction Project scientifically by comparing and monitoring the temporal and spatial changes of ecosystem and its key services between 2000-2008 and 2008-2015 in Tibet Plateau. Comparing the ecosystem in eight years before and eight years after the project, it was concluded that: 1) The ecosystem structure of the Tibet Plateau was stable and less dynamic, and the macro patterns of the ecosystem tended better. The area of forest continued to increase, the desert was significantly reduced, and the area of water and wetland decreased firstly and then increased. 2) The trend of grassland degradation was weakened, and the grassland was obviously restored. The proportion of degrading grassland decreased by 19.9% and the proportion of restored grassland increased by 33%. The vegetation coverage increased 1.9% in Tibet Plateau, especially the alpine meadow. The significantly reduced loading pressure of grassland and the enhanced forage supply capacity both alleviated the contradiction between grassland and livestock. 3) The capacity of ecosystem water conservation increased, the total amount of carbon sinks increased slightly, and the capacity of ecosystem sand fixation increased steadily. However, the increasing rainfall enhanced the erosion, so soil layer could not recover in a short period in spite of the increase of vegetation coverage. Thus, the capacity of soil conservation service declined. 4) The warm and humid climate in the Tibet Plateau is conducive to slow down the process of desertification and promote the ecosystem restoration, and the implementation of the Ecological Security Barrier Protection and Construction Project has positive effects on the improvement of the ecosystem service capacity, especially in the local regions of the project.

Key words: ecological effects, ecological projects, ecosystem services, macrostructure, Tibet Plateau

CLC Number: 

  • X826