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| DOI：10.13522/j.cnki.ggps.20180504 |
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| Using Remote Sensing to Unravel Spatiotemporal Change in Vegetation overage in Middle-low Reaches of the Yarkant Basin |
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GAO Fan, HE Bing, YAN Zhenglong, CHEN Siyu, QIN Shan
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1.College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China; 2. Shaanxi Administration of Surveying, Mapping and Geoinformation, Xi’an 710054, China
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| Abstract: |
| 【Objective】 Vegetation coverage modulates hydrological processes and the purpose of this paper is to study the feasibility of using remote sensing to map the spatiotemporal change of vegetation coverage at catchment scale.【Method】 The study area was at the Yarkant River Basin; the Landsat remote sensing imageries from 2000—2016, along with hydrological, meteorological and socio-economic data, were used to analyzed the spatiotemporal change in vegetation coverage within the basin, with the help of GIS, GPS and other methods.【Result】 ①Vegetation coverage decreased from 6 025.9 km2 in 2000 to 5 620.4 km2 in 2016 at an annual rate of 0.42%, with the areas with poor vegetation coverage deteriorating further. ②Spatially, areas with poor natural vegetation coverage was in the region from the confluence of the Yarkant River and Tiznafu River to the confluence of the Three Rivers. Vegetation coverage loss from 2000—2016 was mainly caused by deterioration of the areas with poor vegetation from the Kaqun reservoir downstream to the confluence of the Yarkant River and Tiznafu River. 【Conclusion】 The deterioration of vegetation coverage in the study area was ascribed to increased evapotranspiration and dropping of groundwater table due to overusing groundwater and surface water. |
| Key words: vegetation coverage; remote sensing; dynamic change; NDVI; Yarkant River |
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