Abstract
Based on the land use data in midstream of the Heihe River Basin in 1986, the CLUE-S model was used to simulate the land use distribution in 2000. In addition, the simulated map was verified by the land use map in 2000. Then the spatial pattern of land used in 2015 under the scenario without water diversion was simulated. The results show that the CLUE-S model could be applied to simulate the spatial pattern of land use changes in midstream of the Heihe River basin. Under both scenarios, cultivated land and construction land area showed a tendency of increasing. Forestland, pastureland and unused land showed a tendency of decreasing, while the convert tendency from unused land to other land use types was accelerated. The water surface area decreased under the scenario without water diversion, while under ecological water diversion scenario it showed a tendency of increasing. After the implementation of water diversion, the speed was accelerated. Under the scenario without water diversion, the main types of land use changes were cultivated land, pastureland and water surface area. Conversely, they were cultivated land, pastureland and unused land.
Highlights
The midstream of the Heihe River Basin belong to typical temperate continental climate, precipitation is rare and spatiotemporal distribution is not uniform, evaporate strongly
The data used in this article includes: DEM data with a resolution of 90m in Heihe River Basin, Land use data of Heihe River Basin in 1986 and 2000, Land use data of Zhangye city in 2015, Road distribution data set of Heihe River Basin, data set of Zhangye irrigation canal system, river distribution data set of Heihe River Basin, reservoir distribution data set of Heihe River Basin, spatial distribution data set of machine-mining Wells in Zhangye city, soil texture data of Heihe River Basin, soil type data sets of Heihe River Basin in 1980s, population grid data set in Heihe River Basin
Because the study of land use change pattern and driving mechanism has obvious scale effect, the choice of appropriate scale is very important to the simulation of land use change
Summary
The midstream of the Heihe River Basin belong to typical temperate continental climate, precipitation is rare and spatiotemporal distribution is not uniform, evaporate strongly. Taking the above principles into consideration, 12 land use driving factors are selected as follows: distance from river, distance from trunk canal, distance from mechanical well, distance from reservoir, distance from road, distance from residential area, soil type, soil structure, altitude, slope, slope direction and population density. The distance factor is to overlay the land use map of the study area with the layers of rivers, channels, mechanical Wells, reservoirs, roads, etc., and use the spatial analysis function of GIS to calculate the distance between each grid in the study area and each element. Slope and slope direction are extracted from DEM data by Surface Analysis function of GIS
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