基于MODIS-NDVI的地表植被时空变化特征及其与环境因子的关系  

Temporal and Spatial Variation Characteristics of Surface Vegetation and Its Relationship with Environmental Factors Based on MODIS-NDVI

作　　者：张亮[1] 蒋军 ZHANG Liang;JIANG Jun(Provincial Geomatics Center of Jiangsu,Nanjing,Jiangsu 210013)

机构地区：[1]江苏省基础地理信息中心,江苏南京210013

出　　处：《安徽农业科学》2022年第4期57-63,共7页Journal of Anhui Agricultural Sciences

基　　金：安徽省教育厅项目(KJ2019A0633)。

摘　　要：[目的]分析植被覆盖时空变化特征及其与环境因子之间的响应关系,为区域生态环境治理和植被保护提供理论基础。[方法]基于16 d合成的MODIS-NDVI数据,结合气象站点数据、地表数字高程模型数据,利用空间动态变化趋势分析法、变异系数法和相关性分析等,开展安徽省长时间序列的地表植被覆盖时空变化特性的研究,探讨植被覆盖变化对气象因子、地形条件等的响应规律。[结果]安徽省月均NDVI变化呈现双峰分布;2010—2019年NDVI呈现振荡上升的趋势,增速为0.0007/a;4个季度的NDVI夏季最高,春季和秋季次之,冬季最低;春季和夏季的NDVI呈现振动缓慢增长的趋势,涨幅均为0.0016/a,秋季NDVI呈现缓慢下降的趋势,降幅为0.0018/a,冬季NDVI波动性及降幅较大,为0.0099/a。空间分布上,安徽省植被覆盖变化整体趋于稳定,植被分布具有明显的南高北低的地域性差异和明显的季节性差异,以淮河和长江为界,春季和冬季的NDVI呈现出中间低南北高的分布特点,秋季安徽省大部分地区的NDVI呈现减少趋势,NDVI由南到北递减。不同气象因素对安徽省植被生长的影响具有空间差异性,NDVI与同期温度之间正相关性大于负相关性;降雨量对植被生长的影响具有滞后性,NDVI与同期降雨量之间负相关性大于正相关性,与前一期的降雨量正相关性大于负相关性。[结论]基于MODIS-NDVI时间序列分析方法可为了解区域植被生长状况、开展具有区域差异性的生态保护与修复工程等提供一定的理论依据。[Objective]To analyze the spatial and temporal variation characteristics of vegetation cover and its relationship with environmental factors,so as to provide a theoretical basis for regional ecological environment management and vegetation protection.[Method]Based on 16 d synthetic MODIS-NDVI data,combined with meteorological station data and surface digital elevation model data,the spatial dynamic change trend analysis method,coefficient of variation method and correlation analysis were used to study the spatial and temporal variation characteristics of surface vegetation cover in Anhui Province for a long time series and explore the response law of vegetation cover change to meteorological factors and topographic conditions.[Result]The monthly average NDVI in Anhui Province showed a bimodal distribution;the NDVI showed an oscillating upward trend with a growth rate of 0.0007/a during the decade from^(2)010 to 2019;the NDVI values in four seasons were the highest in summer,followed by spring and autumn,and the lowest in winter;the NDVI in spring and summer showed an oscillating slow increase.NDVI in spring and summer showed a trend of oscillating slow growth with an increase of 0.0016/a,NDVI in autumn showed a trend of slow decline with a decrease of 0.0018/a,and NDVI in winter had a greater volatility and decrease of 0.0099/a.In terms of spatial distribution,the overall vegetation cover change in Anhui Province tended to be stable,and the vegetation distribution had obvious regional differences of high in the south and low in the north and obvious seasonal differences,taking the Huai River and Yangtze River as the boundary,the NDVI in spring and winter showed the distribution characteristics of low in the middle and high in the north and south,and the NDVI in most areas of Anhui Province in autumn showed a decreasing trend,and the NDVI decreased from south to north.The influence of different meteorological factors on vegetation growth in Anhui Province had spatial variability,and the positive correlation betwee

关 键 词：植被指数 MODIS-NDVI 时空变化特征 环境因子 相关关系 

分 类 号：Q948.11[生物学—植物学]