[1]SHI Zhiyu,ZHAO Qing,WANG Yating,et al.Temporal and Spatial Evolution of Vegetation Cover and Its Relationship with Runoff in Yihe River Basin[J].Research of Soil and Water Conservation,2023,30(01):54-61.[doi:10.13869/j.cnki.rswc.20220601.002]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 01
Page number:
54-61
Column:
Public date:
2023-01-10
- Title:
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Temporal and Spatial Evolution of Vegetation Cover and Its Relationship with Runoff in Yihe River Basin
- Author(s):
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SHI Zhiyu, ZHAO Qing, WANG Yating, ZHANG Lianpeng
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(School of Geography, Geomatics and Planning, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China)
-
- Keywords:
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NDVI; change trend; SCS model; correlation; Yihe River Basin
- CLC:
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P339; S715.3
- DOI:
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10.13869/j.cnki.rswc.20220601.002
- Abstract:
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In order to explore the temporal and spatial evolution characteristics of vegetation cover and its relationship with surface runoff in Yihe River Basin, based on MOD13Q1 NDVI remote sensing image data, the temporal and spatial evolution characteristics of vegetation cover in Yihe River Basin from 2000 to 2020 were analyzed by trend analysis method, the surface runoff depth was simulated by SCS model, and the relationship between vegetation NDVI change and runoff was analyzed by correlation analysis on pixel scale. The results showed that:(1)the NDVI of vegetation in Yihe River Basin increased in a fluctuating trend in the past 20 years, and the spatial distribution of NDVI in the basin was quite different; the areas where NDVI increased mainly distributed in the north of the basin, and the areas where NDVI decreased mainly distributed in the east and south of the basin and urban built-up areas;(2)the runoff depth of Yihe River Basin in different periods showed a gradual increasing trend from northwest to southeast in varying degrees, the runoff depth fluctuated greatly, and the runoff had obvious changes of high and low seasons;(3)there was a coexistence of positive correlation and negative correlation between NDVI and surface runoff, which was mainly insignificant positive correlation; the areas with significant positive correlation mainly concentrated in the north of the basin, and the areas with significant negative correlation mainly concentrated in Lanshan District in the south of the basin. This research shows that the overall vegetation coverage in Yihe River Basin has been improved, but there are differences in vegetation changes in the basin. Vegetation protection and restoration mainly concentrate in the north, while NDVI decreases to a certain extent in the south and east with the increase of human activities. With the increase and decrease of NDVI in different spatial locations in the basin, the runoff mainly shows an increasing trend, and the correlation between them is obviously different on a small spatial scale.