globalchange  > 过去全球变化的重建
DOI: 10.1007/s12524-019-00976-w
WOS记录号: WOS:000473156900004
论文题名:
Understanding Spatio-temporal Pattern of Grassland Phenology in the western Indian Himalayan State
作者: Rajan, Harshit; Jeganathan, C.
通讯作者: Rajan, Harshit
刊名: JOURNAL OF THE INDIAN SOCIETY OF REMOTE SENSING
ISSN: 0255-660X
EISSN: 0974-3006
出版年: 2019
卷: 47, 期:7, 页码:1137-1151
语种: 英语
英文关键词: Grasslands ; Phenology ; Western Himalaya ; Bio-geographic zones ; Climatic zones ; India
WOS关键词: NDVI TIME-SERIES ; LAND-SURFACE PHENOLOGY ; VEGETATION PHENOLOGY ; SPATIAL-PATTERNS ; SPECTRAL INDEXES ; NOISE-REDUCTION ; CLIMATE-CHANGE ; NORTH-AMERICA ; AVHRR ; SATELLITE
WOS学科分类: Environmental Sciences ; Remote Sensing
WOS研究方向: Environmental Sciences & Ecology ; Remote Sensing
英文摘要:

The present study has analysed grassland phenology: start of greening (SOG), end of greening (EOG) and length of greening (LOG), and their rate of change in the western Himalaya in India (Himachal Pradesh) using MODIS NDVI time series data (2001-2015). These metrics were inspected at different stratification levels: state, elevation, climatic zones and bio-geographic provinces. Delayed SOG was observed over 44.87% (P<0.1), and delayed EOG over 63.3% (P<0.1) of grassland grids. LOG was shortened in 24.37% (P<0.1) and extended in 58.04% (P<0.1) of the grids. At the state level, when statistically significant pixels (SSP) and all the pixels (AP) are used (given as SSP:AP), SOG is delayed by 20.27:6.28 days year(-15), while EOG is delayed by 38.02:14.97daysyear(-15) and LOG is extended by 35.07:8.70 year(-15) days. Extended LOG is observed over the temperate and cold arid regions, and shortened LOG is observed over sub-alpine and alpine regions. Variations in SOG and EOG are not uniform across different climatic and bio-geographic regions. However, in the sub-alpine and alpine zones, SOG and EOG followed elevation gradients, i.e. late SOG with early EOG over higher elevations, and early SOG with late EOG over lower elevations. Our study has revealed an interesting pattern of translational phenology (i.e. late SOG and late EOG) of grasslands which hints towards shifting winter period. Overall, it is observed that variations in timing of snowfall and snow cover extent are the reasons for inter-annual variations in the grassland phenology.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/141569
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作者单位: BIT, Dept Remote Sensing, Ranchi, Jharkhand, India

Recommended Citation:
Rajan, Harshit,Jeganathan, C.. Understanding Spatio-temporal Pattern of Grassland Phenology in the western Indian Himalayan State[J]. JOURNAL OF THE INDIAN SOCIETY OF REMOTE SENSING,2019-01-01,47(7):1137-1151
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