Spatio-temporal Variation of Land Use under Changing Environments in Shenwu Irrigation District
BU Huailiang
SHI Haibin
YAN Jianwen
LI Xianyue
ZHU Ke
WANG Yanming
Abstract：This paper investigated the spatio-temporal variation of land use in Shenwu within Hetao Irrigation District with a view to providing guidance to water-saving planning. Using the Landsat images in 1995, 2005 and 2015 and the CART algorithm, the land use over the past two decades was classified into five types. The temporal change of each type, binary-types, land use index, as well as the impact of the water transferred from Yellow Riv-er into this region for irrigation were calculated. The result showed that over the past two decades, the desertified and salinized land in Shenwu had reduced by 43.77%and 62.54%respectively, while cropped and fallow land in-creased by 75.10%and 92.32%respectively. The increase in cropped land was due to the remediation of deserti-fied and salinized land as well as conversion of fallow land into cropping land. We also found that the desertified, salinized and fallow land can change from one to another, occurring primarily at the desert proximal to canals. Secondary soil salinization was mainly caused by surface-water irrigation, which led to shallow groundwater ta-ble rising;the desertification was caused by engineering structures. Land use should be taken into account in plan-ning solutions for resolving the water resource dilemma faced by this region.
Keywords：spatio-temporal variationLand usechanging environmentShenwu irrigation district
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 107-113 )