摘要
归一化植被指数(Normalized difference vegetation index,NDVI)是评估生态环境稳定性的重要指标,西北干旱生态地理区生态环境脆弱,分析其NDVI时空变化及其驱动力对该区域生态植被修复具有重要意义。基于气温、降水量、潜在蒸散发、高程、土壤、夜间灯光指数等多源数据集,采用变异系数、Theil-Sen median趋势分析、Mann-Kendall显著性检验、地理探测器、多尺度地理加权回归(Mixed geographically weighted regression,MGWR)模型等方法,探究了2003—2022年中国西北干旱生态地理区的NDVI时空变化特征以及其驱动因素。结果表明:(1)2003—2022年NDVI整体呈现出增加趋势,变化幅度在0.1974~0.2464之间。其中,NDVI最小值出现在2009年,NDVI最大值出现在2018年。(2)西北干旱生态地理区中,大部分区域的NDVI是处于较低水平,总体呈现出“东西高、中间低”的空间分布格局。(3)西北干旱生态地理区绝大部分地区的NDVI变化程度集中于低稳定性,整体上中部稳定性强,东西部稳定性弱。(4)西北干旱生态地理区NDVI大部分区域显示增大趋势,仅有少部分区域呈现出减少趋势。(5)西北干旱生态地理区NDVI时空变化受自然和人文的综合影响,土壤类型是主要驱动因子,各因子的交互作用对该区域产生影响,MGWR模型分析结果进一步验证了土壤类型对NDVI的作用强度最大,气温、潜在蒸散发呈负向效应,降水量、夜间灯光指数呈正向效应。
The normalized difference vegetation index(NDVI)is a crucial indicator for assessing the stability of the ecological environment.The ecological environment in northwest China’s arid and semi-arid regions is fragile,and analyzing the spatio-temporal changes and driving forces of NDVI is critical for effective vegetation restoration in this area.This study utilizes a variety of datasets,including temperature,precipitation,evapotranspiration,elevation,soil,and nighttime lighting indices.Employing methodologies such as the coefficient of variation,Theil-Sen median trend analysis,the Mann-Kendall significance test,a geographic detector,and the multiscale geographically weighted regression(MGWR)model,we explored the spatiotemporal variation characteristics and driving factors of NDVI in the arid and semi-arid regions of northwest China from 2003 to 2022.The results showed that(1)NDVI exhibited an overall increasing trend from 2003 to 2022,ranging from 0.1974 to 0.2464.The minimum NDVI value was recorded in 2009,whereas the maximum occurred in 2018.(2)Overall,NDVI levels in most areas of the arid and semi-arid region of northwest China are relatively low,displaying a spatial distribution pattern of“high in the east and west,low in the middle”.(3)Most areas experience low stability in NDVI changes,with the central region showing strong stability and the eastern and western regions displaying weak stability.(4)An increasing trend in NDVI was observed across most areas,with only a few regions showing a decline.(5)The spatiotemporal variation of NDVI in the arid and semi-arid region of northwest China is influenced by both natural and human factors,with soil type serving as the primary driving factor.The interplay of various factors also affects the region.MGWR model analysis confirmed that soil type has the most significant effect on NDVI,with air temperature,potential evapotranspiration exerting negative effects,whereas precipitation,and nighttime light index have positive effects.
作者
宋小龙
李陇堂
任婕
吴月
王鹏
米文宝
马明德
SONG Xiaolong;LI Longtang;REN Jie;WU Yue;WANG Peng;MI Wenbao;MA Mingde(Ningxia Vocational and Technical College of Finance and Economics,Yinchuan 750021,Ningxia,China;School of Geographic Science and Planning,Ningxia University,Yinchuan 750021,Ningxia,China;Institute of Culture,Ningxia Academy of Social Sciences,Yinchuan 750011,Ningxia,China;Institute of Rural Economy,Ningxia Academy of Social Sciences,Yinchuan 750011,Ningxia,China;School of Management,North Minzu University,Yinchuan 750021,Ningxia,China)
出处
《干旱区地理》
北大核心
2025年第6期951-962,共12页
Arid Land Geography
基金
宁夏自然科学基金项目(2024AAC05072)资助。
