基于MODIS数据的陕西省植被覆盖时空变化分析  

Spatial and Temporal Changes of Vegetation Cover in Shaanxi Province based on MODIS Data

作　　者：王慧娜 彭建博 WANG Hui-na;PENG Jian-bo(Shaanxi Academy of Forestry,Xi'an,Shaanxi 710082;Shaanxi Forestry Inventory&Planning Institute,Xi'an,Shaanxi 710082)

机构地区：[1]陕西省林业科学院,陕西西安710082 [2]陕西省林业调查规划院,陕西西安710082

出　　处：《陕西林业科技》2025年第1期7-12,共6页Shaanxi Forest Science and Technology

摘　　要：为明确陕西省长时间尺度植被覆盖时空变化规律,本研究主要以MODIS NDVI数据,结合像元二分模型计算植被覆盖度,利用Theil-Sen趋势分析、Mann-Kendall趋势检验、Hurst指数对陕西省2000-2020年植被覆盖度空间演变特征及未来变化趋势进行分析;同时,结合陕西省气象数据,利用相关性分析法进行气候因子对植被覆盖度的影响分析。结果表明:(1)2000-2020年陕西省整体植被覆盖度呈上升趋势,其年增长速率为0.005(p<0.01);(2)2000-2020年陕西省植被覆盖度在空间上以增加趋势为主,呈现增加趋势的面积占陕西省总面积的75.99%,其中呈明显改善的区域占陕西省总面积的50.29%;陕西省植被覆盖度Hurst指数平均值为0.460,表明陕西省未来植被覆盖度主要以反向特征为主。在空间分布上,植被持续改善区域集中于延安市宜川县、榆林市横山区,其面积占陕西省总面积的25.70%;(3)陕西省年际植被覆盖度与年降水量和年平均气温的相关性均呈正相关性,其中与降水量的相关性(0.141)略高于年平均气温(0.106)。In order to clarify the spatial and temporal variation rules of vegetation cover in Shaanxi Province with a long time scale,this study took MODIS NDVI data as the main data source,together with the image element bifurcation model to calculate vegetation cover,and utilized the Theil-Sen trend analysis,the Mann-Kendall trend test,and the Hurst index to analyze the spatial evolution characteristics of vegetation cover in Shaanxi Province from 2000 to 2020,as well as the future change trends were analyzed.Combined with the meteorological data of Shaanxi Province,correlation analysis was used to analyze the influence of climatic factors on vegetation cover.The results showed that:(1)the overall vegetation cover in Shaanxi Province from 2000 to 2020 showed an increasing trend,with a growth rate of 0.005·a-1(p<0.01);(2)the vegetation changes in Shaanxi Province from 2000 to 2020 with spatial scale is dominated by an increasing trend,and the area showing an increasing trend accounts for 75.99%of the total area of Shaanxi Province,of which the area showing significant improvement accounts for 50.29%of the total area of Shaanxi Province;the average value of the Hurst index of vegetation cover in Shaanxi Province is 0.460,indicating that the future of Shaanxi Province's vegetation cover will be dominated by the reverse characteristics.In terms of spatial distribution,the areas of sustained improvement in vegetation cover are concentrated in Yichuan county of Yan'an city and Hengshan District of Yulin city,which accounts for 25.70%of the total area of Shaanxi Province;(3)the correlation between inter-annual vegetation cover and annual precipitation and average annual air temperature in Shaanxi Province shows a positive correlation,with the correlation with precipitation(0.141)slightly higher than that with average annual air temperature(0.106).

关 键 词：MODIS NDVI 陕西省 植被覆盖度 时空变化 归因分析 

分 类 号：P237[天文地球—摄影测量与遥感]