基于多模型和多数据源的青藏高原春季物候时空格局分析（英文）

编号 zgly0001584687

文献类型 期刊论文

文献题名 基于多模型和多数据源的青藏高原春季物候时空格局分析（英文）

作者 丁明军  李兰晖  张镱锂  孙晓敏  刘林山  高俊刚  王兆锋  李英年 

作者单位 KeyLabofPoyangLakeWetlandandWatershedResearchofMinistryofEducationandSchoolofGeographyandEnvironment  JiangxiNormalUniversity  KeyLaboratoryofLandSurfacePatternandSimulation  InstituteofGeographicSciencesandNaturalResources 

母体文献 Journal of Geographical Sciences 

年卷期 2015年02期

年份 2015 

分类号 P464 

关键词 phenology  NDVI  startofvegetationgrowingseason  method  TibetanPlateau 

文摘内容 In this study,we have used four methods to investigate the start of the growing season(SGS) on the Tibetan Plateau(TP) from 1982 to 2012,using Normalized Difference Vegetation Index(NDVI) data obtained from Global Inventory Modeling and Mapping Studies(GIMSS,1982-2006) and SPOT VEGETATION(SPOT-VGT,1999-2012).SGS values estimated using the four methods show similar spatial patterns along latitudinal or altitudinal gradients,but with significant variations in the SGS dates.The largest discrepancies are mainly found in the regions with the highest or the lowest vegetation coverage.Between 1982 and 1998,the SGS values derived from the four methods all display an advancing trend,however,according to the more recent SPOT VGT data(1999-2012),there is no continuously advancing trend of SGS on the TP.Analysis of the correlation between the SGS values derived from GIMMS and SPOT between 1999 and 2006 demonstrates consistency in the tendency with regard both to the data sources and to the four analysis methods used.Compared with other methods,the greatest consistency between the in situ data and the SGS values retrieved is obtained with Method 3(Threshold of NDVI ratio).To avoid error,in a vast region with diverse vegetation types and physical environments,it is critical to know the seasonal change characteristics of the different vegetation types,particularly in areas with sparse grassland or evergreen forest.