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Vegetation greenness modeling in response to climate change for Northeast Thailand

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文摘 In Northeast Thailand,the climate change has resulted in erratic rainfall and temperature patterns. The region has experienced both periods of drought and seasonal floods with the increasing severity. This study investigated the seasonal variation of vegetation greenness based on the Normalized Difference Vegetation Index(NDVI) in major land cover types in the region. An assessment of the relationship between climate patterns and vegetation conditions observed from NDVI was made. NDVI data were collected from year 2001 to2009 using multi-temporal Terra MODIS Vegetation Indices Product(MOD13Q1). NDVI profiles were developed to measure vegetation dynamics and variation according to land cover types. Meteorological information,i.e. rainfall and temperature,for a 30 year time span from1980 to 2009 was analyzed for their patterns. Furthermore,the data taken from the period of2001-2009,were digitally encoded into GIS database and the spatial patterns of monthly rainfall and temperature maps were generated based on kriging technique. The results showed a decreasing trend in NDVI values for both deciduous and evergreen forests. The highest productivity and biomass were observed in dry evergreen forests and the lowest in paddy fields. Temperature was found to be increasing slightly from 1980 to 2009 while no significant trends in rainfall amounts were observed. In dry evergreen forest,NDVI was not correlated with rainfall but was significant negatively correlated with temperature. These results indicated that the overall productivity in dry evergreen forest was affected by increasing temperatures. A vegetation greenness model was developed from correlations between NDVI and meteorological data using linear regression. The model could be used to observe the change in vegetation greenness and dynamics affected by temperature and rainfall.
来源 Journal of Geographical Sciences ,2013,23(6):1052-1068 【核心库】
DOI 10.1007/s11442-013-1062-2
关键词 Normalized Difference Vegetation Index (NDVI) ; vegetation greenness ; climate variability ; modeling
地址

Department of Environmental Engineering, Khon Kaen University, Thailand, Khon Kaen, 40002

语种 英文
文献类型 研究性论文
ISSN 1009-637X
学科 大气科学(气象学)
文献收藏号 CSCD:5021287

参考文献 共 30 共2页

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引证文献 6

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