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Remote Sens. 2016, 8(1), 6; doi:10.3390/rs8010006

Urban Land-Cover Change and Its Impact on the Ecosystem Carbon Storage in a Dryland City

1
State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
School of Resources Environment Science and Engineering, Hubei University of Science and Technology, Xianning 437100, China
4
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
*
Author to whom correspondence should be addressed.
Academic Editors: Dengsheng Lu, Guomo Zhou, Conghe Song, Alfredo R. Huete and Prasad S. Thenkabail
Received: 1 September 2015 / Revised: 3 December 2015 / Accepted: 3 December 2015 / Published: 24 December 2015
(This article belongs to the Special Issue Carbon Cycle, Global Change, and Multi-Sensor Remote Sensing)
View Full-Text   |   Download PDF [3527 KB, uploaded 24 December 2015]   |  

Abstract

Lack of research into the complexity in urban land conversion, and paucity of observational data of soil organic carbon (SOC) beneath impervious surface area (ISA) limit our understanding of the urbanization effects on carbon (C) pools in dryland cities. Employing Landsat TM images acquired in 1990 and 2010, a hybrid classification method consisting of Linear Spectral Mixture Analysis and decision tree classification was applied to retrieve the land cover (water, ISA, greenspace, cropland, and remnant desert) of the largest dryland city in China—Urumqi. Based on vegetation carbon (VEGC) and SOC density data determined through field observations and literature reviews, we developed Urumqi’s C pool maps in 1990 and 2010, and assessed the urbanization impacts on ecosystem C. Our results showed that ISA tripled from 1990 to 2010 displacing remnant desert and cropland. The urban landscape, especially the greenspaces, became obviously fragmented. In 2010, more than 95% of the urban ecosystem C was SOC, 48% of which under the ISA. The city lost 19% of C stock from 1990 to 2010. About 82% of the ecosystem C loss was caused by the conversion of remnant desert and cropland into ISA, mainly in the northern city. View Full-Text
Keywords: land-cover change; ecosystem organic C; soil organic C; vegetation C; Urumqi land-cover change; ecosystem organic C; soil organic C; vegetation C; Urumqi
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yan, Y.; Zhang, C.; Hu, Y.; Kuang, W. Urban Land-Cover Change and Its Impact on the Ecosystem Carbon Storage in a Dryland City. Remote Sens. 2016, 8, 6.

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