宁夏河东沙地植被覆盖变化及影响因素  

Vegetation Cover Change and Influencing Factors in the Hedong Sandy Land of Ningxia

作　　者：马思怡 展秀丽 张维福 张呈春 Ma Siyi;Zhan Xiuli;Zhang Weifu;Zhang Chengchun(Ningxia University,Yinchuan 750021,P.R.China)

机构地区：[1]宁夏大学,银川750021

出　　处：《东北林业大学学报》2025年第5期82-89,共8页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(42161013);宁夏自然科学基金项目(2024AAC03078)。

摘　　要：沙地植被变化能够指示其生态环境的发展变化,研究沙地植被的动态变化及其影响因子对于维持沙漠生态系统的稳定具有指导意义。以宁夏黄河东部沙地为研究区,根据2000—2022年Landsat遥感影像,利用像元二分模型提取研究区植被覆盖度,采用趋势分析法分析研究区植被覆盖度的空间演变特征,并利用地理探测器探测9个影响因子以及任意两个不同因子之间的交互作用对植被覆盖变化的影响。结果表明:(1)2000—2022年,研究区域植被覆盖度呈波动上升趋势,植被覆盖度66.10%的地区呈上升趋势,33.90%的地区呈下降趋势;(2)自然因子对于植被覆盖空间分异的影响高于人为因子,年均降水量、年均温和蒸散发量为研究区植被覆盖空间分布总体格局差异形成的主要驱动因素;(3)影响因子中,任意两个因子交互作用对植被覆盖度的贡献程度比单因子更高,影响因子之间的交互作用对提高区域植被覆盖度具有协同作用。The change of vegetation in sandy lands can indicate the development and change of the ecological environment.Studying the dynamic changes of sandy land vegetation and its influencing factors has guiding significance for maintaining the stability of the desert ecosystem.Taking the sandy land to the east of the Yellow River in Ningxia as the study area,based on the Landsat remote sensing images from 2000 to 2022,the dimidiate pixel model was used to extract the vegetation coverage of the study area.The trend analysis method was adopted to analyze the spatial evolution characteristics of the vegetation coverage in the study area,and the geographical detector was used to detect the impacts of 9 influencing factors and the interaction between any two different factors on the change of vegetation coverage.The results show that:(1)From 2000 to 2022,the vegetation coverage in the study area showed a fluctuating upward trend.In 66.10%of the area with vegetation coverage in the study area,there was an upward trend,while in 33.90%of the area,there was a downward trend.(2)The influence of natural factors on the spatial differentiation of vegetation coverage was higher than that of human factors.The annual average precipitation,annual average temperature and evapotranspiration were the most important driving factors for the formation of the overall pattern differences in the spatial distribution of vegetation coverage in the study area.(3)Among the influencing factors,the contribution degree of the interaction between any two factors to the vegetation coverage was higher than that of a single factor,and the interaction between the influencing factors had a synergistic effect on improving the regional vegetation coverage.

关 键 词：归一化植被指数 植被覆盖 地理探测器 宁夏 

分 类 号：K903[历史地理—人文地理学]