Phenological characteristics of the main vegetation types on the Tibetan Plateau based on vegetation and water indices

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Peng, D.L.^2 ; Zhou, B.^1 ; Li, C.J.^3 ; Huang, W.J.^2 ; Wu, Y.P.^4 ; Yang, X.H.^4

Institute of Remote Sensing and Earth Sciences, Hangzhou Normal University, Hangzhou, China^1

Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China^2

Beijing Research Center for Information Technology in Agriculture, Beijing, China^3

Space Weather Center, Meteorological and Hydrographic Department, Beijing, China^4

关键词: Broadleaf forest;    Enhanced vegetation index;    Land surface water index;    Normalized difference vegetation index;    Seasonal variation;    Short wave infrared;    Surface reflectance;    Tibetan Plateau;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012077/pdf
DOI  :  10.1088/1755-1315/17/1/012077

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Plant phenology is considered one of the most sensitive and easily observable natural indicators of climate change, though few studies have focused on the heterogeneities of phenology across the different vegetation types. In this study, we tried to find the phenological characteristics of the main vegetation types on the Tibetan Plateau. MCD12Q1 images over the Tibetan Plateau from 2001 to 2010 were used to extract the main vegetation types. The Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), and Land Surface Water Index (LSWI) were calculated using surface reflectance values from the blue, red, near-infrared, short-wave infrared (SWIR) 6 (for LSIW6), and SWIR7 (for LSIW7) bands derived from MOD09A1 and used to explore the phenological characteristics of the main vegetation types on the Tibetan Plateau. The results showed that there were eight constant vegetation types on the Tibetan Plateau from 2001 to 2010 demonstrating multiple phenological characteristics. Evergreen needleleaf forest, evergreen broadleaf forest, and permanent wetland had the minimum NDVI values during the summer season, while open shrubland and grassland had the maximum NDVI/EVI values during this period. NDVI and EVI of cropland/natural vegetation had two peaks for their seasonal variations. EVI showed a more significant correlation with LSWI6/LSWI7 than NDVI. Compared to LSWI7, larger EVI values occurred in evergreen needleleaf forest, evergreen broadleaf forest, mixed forest, and permanent wetland, while smaller values occurred in shrubland and barren or sparsely vegetated cover, and nearly equal values occurred in grassland and cropland.