›› 2013, Vol. 23 ›› Issue (6): 1052-1068.doi: 10.1007/s11442-013-1062-2

• Research Articles • 上一篇    下一篇

Vegetation greenness modeling in response to climate change for Northeast Thailand

Watinee THAVORNTAM1, Netnapid TANTEMSAPYA1,2   

  1. 1. Department of Environmental Engineering, Khon Kaen University, Khon Kaen 40002, Thailand;
    2. Research Center for Environmental and Hazardous Substance Management, Khon Kaen University, Khon Kaen 40002, Thailand
  • 收稿日期:2012-12-19 修回日期:2013-04-10 出版日期:2013-12-15 发布日期:2013-11-14
  • 通讯作者: Netnapid Tantemsapya, Asst. Professor, E-mail: netnapid@kku.ac.th E-mail:netnapid@kku.ac.th
  • 作者简介:Watinee Thavorntam, Ph.D Candidate, E-mail: watsao@kku.ac.th

Vegetation greenness modeling in response to climate change for Northeast Thailand

Watinee THAVORNTAM1, Netnapid TANTEMSAPYA1,2   

  1. 1. Department of Environmental Engineering, Khon Kaen University, Khon Kaen 40002, Thailand;
    2. Research Center for Environmental and Hazardous Substance Management, Khon Kaen University, Khon Kaen 40002, Thailand
  • Received:2012-12-19 Revised:2013-04-10 Online:2013-12-15 Published:2013-11-14
  • Contact: Netnapid Tantemsapya, Asst. Professor, E-mail: netnapid@kku.ac.th E-mail:netnapid@kku.ac.th
  • About author:Watinee Thavorntam, Ph.D Candidate, E-mail: watsao@kku.ac.th

摘要:

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 to 2009 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 from 1980 to 2009 was analyzed for their patterns. Furthermore, the data taken from the period of 2001-2009, 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.

关键词: Normalized Difference Vegetation Index (NDVI), vegetation greenness, climate variability, modeling

Abstract:

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 to 2009 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 from 1980 to 2009 was analyzed for their patterns. Furthermore, the data taken from the period of 2001-2009, 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.

Key words: Normalized Difference Vegetation Index (NDVI), vegetation greenness, climate variability, modeling