| Cite this article: | 袁瑞强,青松.2002—2015年黄河流域NDVI变化特征及对陆地水储量的响应[J].灌溉排水学报,0,():-. |
| yuanruiqiang,qingsong.2002—2015年黄河流域NDVI变化特征及对陆地水储量的响应[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Variation characteristics of NDVI in the Yellow River Basin from 2002 to 2015 and its response to terrestrial water storage |
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yuanruiqiang, qingsong
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Inner Mongolia Normal University
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| Abstract: |
| 【Background】Vegetation is one of the most important components of the terrestrial ecosystem. It has the function of connecting the ecological elements such as the atmosphere, soil and hydrology, and can provide a strong guarantee for the natural ecosystem and human production and life. The spatial and temporal changes of vegetation will cause changes in surface parameters, which will affect the balance of energy and water on the surface. At present, monitoring and analysis of influencing factors for long-term vegetation changes has become an important content of global change research, and can provide a scientific basis for regional ecological environmental protection and sustainable development.【Objective】Analyze the temporal and spatial changes of NDVI in the Yellow River Basin, and explore the response of NDVI to terrestrial water reserves (TWSA).【Method】Based on GIMMS NDVI and GRACE TWSA remote sensing data, the Theil-sen trend analysis, M-K trend test, and correlation analysis were used to analyze the NDVI change characteristics and its response to TWSA during the growing season of the Yellow River Basin from 2002 to 2015.【Results】The average annual NDVI of the vegetation in the growing season of the Yellow River Basin from 2002 to 2015 was 0.4156, which generally showed a rising trend with a growth rate of 0.35%/a. The individual interannual changes were relatively volatile. In terms of spatial distribution, the NDVI of the Yellow River Basin showed strong differences, and the overall distribution decreased from southeast to northwest. The areas where vegetation NDVI increased significantly were mainly distributed in the Loess Plateau region of the Yellow River Basin. The areas where vegetation NDVI decreased significantly were scattered in the southern and downstream areas of the watershed. Most areas of the watershed increased NDVI as the main trend. The responses of vegetation NDVI and TWSA showed significant spatial differences, and the areas that were positively correlated were mainly distributed in the Sanjiangyuan region of the upper Yellow River, southern Gansu and Ningxia, and eastern Inner Mongolia.【Conclusion】TWSA has a greater correlation with vegetation in the upstream and middle reaches of the region, while the correlation in the middle and lower reaches is not obvious or even negatively related. On the one hand, this is caused by the water and heat conditions in the Yellow River Basin, and the areas with rare precipitation in the middle and upper reaches At this time, TWSA has a greater impact on vegetation; on the other hand, the change of vegetation NDVI is not only affected by TWS, but the role of human activities cannot be ignored. |
| Key words: NDVI; TWSA; temporal and spatial changes; correlation analysis; Yellow River Basin |
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