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Journal of Arid Land  2015, Vol. 7 Issue (3): 350-360    DOI: 10.1007/s40333-014-0082-9
Brief Communication     
Spatial dynamics of aboveground carbon stock in urban green space: a case study of Xi’an, China
ZhengYang YAO1, JianJun LIU1*, XiaoWen ZHAO2, DongFeng LONG , Li WANG2
1 College of Landscape Architecture and Arts, Northwest A&F University, Yangling 712100, China;
2 College of Forestry, Northwest A&F University, Yangling 712100, China
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Abstract  Greenhouse gas emission of carbon dioxide (CO2) is one of the major factors causing global climate change. Urban green space plays a key role in regulating the global carbon cycle and reducing atmospheric CO2. Quantifying the carbon stock, distribution and change of urban green space is vital to understanding the role of urban green space in the urban environment. Remote sensing is a valuable and effective tool for monitoring and estimating aboveground carbon (AGC) stock in large areas. In the present study, different remotely-sensed vegetation indices (VIs) were used to develop a regression equation between VI and AGC stock of urban green space, and the best fit model was then used to estimate the AGC stock of urban green space within the beltways of Xi’an city for the years 2004 and 2010. A map of changes in the spatial distribution patterns of AGC stock was plotted and the possible causes of these changes were analyzed. Results showed that Normalized Difference Vegetation Index (NDVI) correlated moderately well with AGC stock in urban green space. The Difference Vegetation Index (DVI), Ratio Vegetation Index (RVI), Soil Adjusted Vegetation Index (SAVI), Modified Soil Adjusted Vegetation Index (MSAVI) and Renormalized Difference Vegetative Index (RDVI) were lower correlation coefficients than NDVI. The AGC stock in the urban green space of Xi’an in 2004 and 2010 was 73,843 and 126,621 t, respectively, with an average annual growth of 8,796 t and an average annual growth rate of 11.9%. The carbon densities in 2004 and 2010 were 1.62 and 2.77 t/hm2, respectively. Precipitation was not an important factor to influence the changes of AGC stock in the urban green space of Xi’an. Policy orientation, major ecological greening projects such as “transplanting big trees into the city” and the World Horticultural Exposition were found to have an important impact on changes in the spatiotemporal patterns of AGC stock.

Key wordsfractal dimension      anti-erodibility      soil profile      land use pattern      Loess Plateau     
Received: 15 April 2014      Published: 05 February 2015

This research was supported by the Forestry Research Foundation for the Public Service Industry of China (200904004).

Cite this article:

ZhengYang YAO, JianJun LIU, XiaoWen ZHAO, DongFeng LONG, Li WANG. Spatial dynamics of aboveground carbon stock in urban green space: a case study of Xi’an, China. Journal of Arid Land, 2015, 7(3): 350-360.

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