JOURNAL OF NATURAL RESOURCES ›› 2013, Vol. 28 ›› Issue (6): 994-1006.doi: 10.11849/zrzyxb.2013.06.010

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Effects of Land Use/Land Cover Change on Carbon Storage in Manas River Watershed over the Past 50 Years

WANG Yuan-gang1,2, LUO Ge-ping1, FENG Yi-xing1, HAN Qi-fei1,2, FAN Bin-bin1,2, CHEN Yao-liang1,2   

  1. 1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, CAS, Urumqi 830011, China;
    2. University of the Chinese Academy of Science, Beijing 100049, China
  • Received:2012-06-02 Revised:2012-11-08 Online:2013-06-20 Published:2013-06-20

Abstract:

Research on the impact of land use/land cover change on carbon budget is one of the key issues in the field of global change, as well as a possible way to answer the question of "Missing carbon sink". However, this issue in northwest arid area of China is weak, which limits comprehensive understanding of the mechanism of the interaction between land use change and carbon cycle. In this paper, Manas River Watershed was chosen as the study area due to its representativeness of water and land exploitation in this area. By adopting empirical statistical model—Bookkeeping model, research on effects of two main types of land use/cover change (desert change into farmland and farmland abandonment) on the carbon budget were carried out in Manas River Watershed over the past 50 years. Land cover map, published vegetation/soil carbon density data as well as field survey data are utilized for this research. Results showed that the reclamation activity of Manas River Watershed increases carbon stocks. From 1962 to 2008, vegetation and soil carbon storage of the watershed increased by 6.34×105 and 3.14×106 t, respectively, which result in the total carbon stock increase by 3.77×106 t. The impacts of different land use/land cover change on carbon budget are significantly different because of the variation in area and carbon density between conversion types: Vegetation and soil carbon storage are significantly increased with reclamation of arable land from desert grassland and bare land; the vegetation and total carbon storage reduced while soil carbon storage increased with the conversion of woodland to arable land; carbon storage in Manas River Watershed reduced because of farmland abandonment.

Key words: LUCC, carbon budget, Bookkeeping model, Manas River Watershed

CLC Number: 

  • TP79