吕梁山地区常绿植被物候的提取和分布差异  

Phenology Extraction and Distribution Difference of Evergreen Vegetation in Lvliang Mountain Area

作　　者：王贝贝 周淑琴[1] 荆耀栋[1] 宋晓静 WANG Bei-bei;ZHOU Shu-qin;JING Yao-dong;SONG Xiao-jing(College of Resources and Environment,Shanxi Agricultural University,Taigu 030800,China)

机构地区：[1]山西农业大学资源环境学院,山西太谷030800

出　　处：《江西农业学报》2021年第3期50-55,共6页Acta Agriculturae Jiangxi

基　　金：山西省软科学研究计划项目(2016041036-2、2018041004-1);山西农业大学科技创新基金(2018YJ23)。

摘　　要：山西省吕梁山地区气候、地形多变,常绿植被分布较多,其物候对环境变化敏感,提取和研究常绿植被物候能为全球变化和常绿植被的其他研究提供基础。利用MODIS NDVI数据,通过Savitzky-Golay滤波和动态阈值法提取吕梁山常绿植被物候,并运用趋势分析法定量分析了植被物候在空间和地形的差异。结果表明:(1)吕梁山地区常绿植被生长季开始日期(SOS)在第95~130天之间,生长季结束日期(EOS)在第280~320天之间,生长季长度(LOS)在第160~230天之间。(2)研究区常绿植被物候与纬度关系密切,随着纬度由南向北升高,植被SOS显著推迟(R^(2)=0.9265,P<0.001),EOS显著提前(R^(2)=0.8656,P<0.01),LOS显著缩短(R^(2)=0.9620,P<0.001)。(3)常绿植被物候在地形上的差异明显。海拔升高,植被SOS显著推迟、EOS显著提前、LOS显著缩短;坡度变大,植被SOS显著推迟,EOS显著提前,LOS显著缩短;各坡向的植被物候差异明显,植被SOS最大相差2.6 d,植被EOS最大相差3.6 d,植被LOS最大相差5.2 d。所提取的吕梁山地区常绿植被物候与其他研究结果相近,植被物候在空间和地形上存在显著差异。The climate and topography of Lvliang Mountain are changeable,and the evergreen vegetation is more distributed,and its phenology is sensitive to environmental changes.Extracting and studying the phenology of evergreen vegetation can provide a basis for global change and other research on evergreen vegetation.In this study,MODIS NDVI data,Savitzky-Golay filtering and dynamic threshold method were used to extract the phenology of evergreen vegetation in Lvliang Mountain,and the trend analysis method was used to quantitatively analyze the difference of vegetation phenology in space and terrain.The results showed that the start of the growing season(SOS)of the evergreen vegetation in Liangshan area was between the 95th and 130th days,and the end of the growing season(EOS)was between 280th and 320th days,the length of the growing season(LOS)is between 160th and 230th days.The phenology of evergreen vegetation in the study area is closely related to latitude.As the latitude increases from south to north,vegetation SOS is significantly delayed(R^(2)=0.9265,P<0.001),and EOS is significantly advanced(R^(2)=0.8656,P<0.01),LOS was significantly shortened(R^(2)=0.9620,P<0.001).The phenology of evergreen vegetation has obvious differences in topography.With the increase of the altitude,the vegetation SOS is significantly delayed.EOS is significantly advanced,and the LOS is significantly shortened.The slope becomes larger,and the vegetation SOS is significantly delayed.EOS is significantly advanced,and the LOS is significantly shortened.The vegetation phenology of each slope direction is significantly different,and the maximum difference in vegetation SOS is 2.6 d.The maximum difference of vegetation EOS is 3.6 d,and the maximum difference of vegetation LOS is 5.2 d.The phenology of evergreen vegetation in the Lvliang Mountain area extracted in this study is similar to other studies,and the vegetation phenology is significantly different in space and topography.

关 键 词：常绿植被 物候提取 空间差异 MODIS NDVI数据 吕梁山地区 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]