摘要
[目的]探究黄河中游NDVI时空变化,阐明自然和人为因素对NDVI变化的影响和驱动力,并为黄河中游生态保护与发展提供科学依据。[方法]基于AVHRR GIMMS NDVI数据集,采用线性回归分析、Mann-Kendall检验、地理探测器模型,分析了1982—2015年黄河中游植被NDVI的时空演变特征,并对影响植被NDVI的自然和人为因子进行了驱动力分析。[结果]1982—2015年黄河中游NDVI呈上升趋势,空间上呈东南高西北低分布.植被覆盖改善面积高达70.79%,显著改善面积为49.2%。年降水量是黄河中游NDVI变化的主要驱动因子,植被类型、地貌类型、土地利用类型和土壤类型等因子也能很好地解释黄河中游植被覆盖状况。自然因子对植被变化的影响远高于人为因子,因子交互结果为双因子增强或非线性增强。[结论]黄河中游植被NDVI主要受年降水量影响,34年间在自然和人为因素交互作用下植被显著改善,未来应更加注重人类活动对植被覆盖的影响。
[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.
作者
李自闯
董国涛
姚楠
Li Zichuang;Dong Guotao;Yao Nan(School of Surveying&Land Information Engineering,Henan Polytechnic University,Jiaozuo,Henan 454003,China;Yellow River Institute of Hydraulic Research,Yellow River Conservancy Commission,Zhengzhou 450003,China;Heihe Water Resources and Ecological Protection Research Center,Lanzhou 730030,China)
出处
《水土保持研究》
CSCD
北大核心
2024年第2期202-210,共9页
Research of Soil and Water Conservation
基金
国家自然科学基金(51779099)
河南省科技攻关项目(232102320247)。
关键词
NDVI
时空变化
地理探测器模型
黄河中游
NDVI
change of time and space
Geodetectormode
middle reaches of Yellow River
