1982-2015年黄河中游NDVI时空变化及驱动力分析OA北大核心CSTPCD

[Objective]The aims of this study are to explore the spatiotemporal changes of NDVI in the middle reaches of the Yellow River,to clarify the impact and driving forces of natural and human factors on NDVI changes,and to provide scientific basis for ecological protection and development.[Methods]Based on the AVHRR GIMMS NDVI dataset,linear regression analysis,Mann-Kendall test and Geodetector-mode were used to analyze the spatiotemporal evolution characteristics of vegetation NDVI in the middle reaches of Yellow River from 1982 to 2015.The driving forces of natural and human factors affecting vegetation NDVI were also analyzed.[Results]From 1982 to 2015,the NDVI of the middle reaches of Yellow River showed upward trend,with spatial distribution of high level in the southeast and low level in the northwest.The improved vegetation coverage area reached to 70.79%,with a significant improvement area of 49.2% .Annual precipitation was the dominant factor affecting NDVI changes in the middle reaches of Yellow River,and factors such as vegetation type,geomorphic type,land use type and soil type could also explain the vegetation cover status in the middle reaches of Yellow River.The impact of natural factors on vegetation change was much higher than that of human factors,and the result of factor interaction was a dual factor enhancement or non-linear enhancement.[Conclusion]The NDVI of the vegetation in the middle reaches of the Yellow River is mainly affected by annual precipitation,and the vegetation had improved significantly during the 34-year period under the interaction of natural and human factors,and more attention should be paid to the influence of human activities on the vegetation cover in the future.