The Nelson A. Rockefeller Center for Public Policy and the Social Sciences

Impacts of land cover change and water management practices on the Tarim and Konqi river systems, Xingjiang, China

Faculty Scholarship
December 01, 2016
Francis
J.
Magilligan
Author
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Executive Summary

Journal of Applied Remote Sensing

Author(s): Jonathan W. Chipman, Xun Shi, Francis J. Magilligan, Yaning Chen, and Baofu Li.

Abstract. The Tarim and Konqi Rivers in western China have experienced dramatic changes in streamflow and riparian vegetation due to climatic variability, land cover change, and water man-agement including interbasin water transfers. To assess the extent and evolution of vegetation dynamics along these rivers, we use Landsat and MODIS images for land cover classification, spectral mixture analysis, and landscape phenology analysis. From 1998 to 2011, agriculture nearly tripled in extent, from 1376 to 3742 km2. Natural riparian vegetation persisted in aggre-gate but experienced losses (to agriculture) in some areas while expanding into barren land else-where. Spectral mixture analysis suggests that interbasin water transfers from the Konqi to the Tarim River increased near-channel riparian vegetation on the Tarim at the expense of vegetation on the Konqi. A time-series of MODIS images reveals a pattern of increasing and decreasing greenness across the region, including loss of vegetation in distal regions that were formerly subject to sporadic seasonal flooding but now are cut off from their water supply due to water management. These results suggest that satellite remote sensing may play a valuable role in monitoring the effects of changing land use and hydrology on riparian systems in Central Asia and other arid regions. © 2016 Society of Photo-Optical Instrumentation Engineers (SPIE) [DOI: 10.1117/1.JRS.10.046020]

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