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	Spatiotemporal trends of terrestrial vegetation activity along the urban development intensity gradient in China's 32 major cities
	Zhou D. C. ; Zhao S. Q. ; Liu S. G. ; Zhang L. X.
	2014
关键词	Urbanization MODIS enhanced vegetation index (EVI) Actual urbanization effects (AUE) Theoretical urbanization effects (TUE) Positive urban effects (PUE) AIC net primary productivity gross primary production new-york-city land-cover carbon storage climate-change united-states time-series heat-island 2 decades
英文摘要	Terrestrial vegetation plays many pivotal roles in urban systems. However, the impacts of urbanization on vegetation are poorly understood. Here we examined the spatiotemporal trends of the vegetation activity measured by MODIS Enhanced Vegetation Index (EVI) along Urban Development Intensity (UDI) gradient in 32 major Chinese cities from 2000 to 2012. We also proposed to use a new set of concepts (i.e., actual, theoretical, and positive urbanization effects) to better understand and quantify the impacts of urbanization on vegetation activities. Results showed that the EVI decreased significantly along a rising UDI for 28 of 32 cities (p < 0.05) in linear, convex or concave form, signifying the urbanization impacts on vegetation varied across cities and UDI zones within a city. Further, the actual urbanization effects were much weaker than the theoretical estimates because of the offsetting positive effects generated by multiple urban environmental and anthropogenic factors. Examining the relative changes of EVI in various UDI zones against that in the rural area (Delta EVI), which effectively removed the effects of climate variability, demonstrated that Delta EVI decreased markedly from 2000 to 2012 for about three-quarters of the cities in the exurban (0.05 <= (JDI 025) and suburban (0.25 <= UDI 0.5), and only half of the cities in the urban (0.5 <= UDI 0.75) and urban core (0.75 <= 1). The stable or even increasing tendencies of Delta EVI in the urban and urban core of many cities could primarily be attributed to the importance of positive effects derived from the urban environment and the improvement of management and maintenance of urban green space. More work is needed to quantify mechanistically the detailed negative and positive effects of urban environmental factors and management practices on vegetation activities. (C) 2014 Elsevier B.V. All rights reserved.
出处	Science of the Total Environment
卷	488
页	136-145
收录类别	SCI
语种	英语
ISSN号	0048-9697
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29363]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Zhou D. C.,Zhao S. Q.,Liu S. G.,et al. Spatiotemporal trends of terrestrial vegetation activity along the urban development intensity gradient in China's 32 major cities. 2014.

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