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| DOI：10.13522/j.cnki.ggps.2023008 |
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| Change in vegetation coverage in Urumqi River basin and theunderlying determinants |
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KAMILAN·Abulike, YANG Han
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1. Institute of Geography and Tourism, Xinjiang Normal University, Urumqi 830054, China;
2. Xinjiang Key Laboratory of Lake Environment and Resources in Arid Zone, Urumqi 830054, China
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| Abstract: |
| 【Objective】The Urumqi River is one of the most important rivers in northwestern China. The objective of this paper is to study the change in vegetation coverage in its basin and the underlying determinants in attempts to help improve its management.【Method】The study is based on the Landsat TM/OLI remote sensing imageries from 2000 to 2020. Spatiotemporal variations in vegetation coverage (FVC) in the basin during this period are extracted using the image dichotomy and vegetation cover transfer matrix, from which we analyze the changes in land use and topographic features in the basin. The factors that are responsible for the change in FVC in the basin are calculated using the geo-detector model, reclassification and other methods.【Result】 From 2000 to 2020, vegetation coverage in the basin decreased first and then increased. Vegetation coverage was high in the upper reaches and low in the middle and low reaches. Vegetation coverage in different land usage was ranked in the order of forest land > cropland > grassland > construction land > water bodies > unused land. The change in vegetation coverage was influenced by topographic factors and fluctuated with elevation, with the vegetation coverage being the highest in elevations <500m and between 2 000 to 2 500 m. Across the basin, vegetation coverage was negatively correlated to slope. The results of the factor detection analysis showed that environmental factors that affected vegetation coverage were ranked in the order of land use > air temperature > elevation > surface temperature > precipitation > soil moisture > slope > slope direction. The results of the interaction detection analysis show that elevation-land use, land use-temperature are the coupling factors that influenced vegetation coverages more than coupling of other factors.【Conclusion】The average vegetation coverage in the Urumqi River basin varied from 0.348 to 0.456 in 2000—2020; it varied spatially. Overall, it is high in the upper reach and low in the middle and lower reaches. Variation in land use explains the variation in the vegetation coverage more than any other natural factors. |
| Key words: vegetation coverage; land use; topographic factor; geographic detector |
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