A study of the drought impact on vegetation and its spatial variation in Taiwan

Su Fen Wang, Meng Fen Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Drought has profound influences on plant growth as well as ecosystem structure and function. Many studies have predicted that drought will be more frequent in the future due to global change. This will cause major change in ecosystem and possibly change the carbon budget from carbon sinks to carbon sources. Such changes may in turn aggravate global climate change. The rainfall pattern has been undergoing major changes in Taiwan. Both floods and droughts become more prominent and frequent. Because of the complicate interaction between topography and monsoons, the changes in rainfall patterns diverge considerably in different time and space. Although drought tends to change carbon budget in ecosystem, few studies have examined the impact of drought on vegetation growth in Taiwan. Therefore, this study aims to examine the effects of drought events on vegetation growth in different regions of Taiwan. Muti-years MODIS satellite data are used to calculate the normalized difference vegetation index (NDVI) after dry seasons as well as to evaluate drought-induced vegetation changes. The results show that during dry seasons the rainfalls were very diverse in different region of Taiwan. We also found several significant drought events occurring from 2001 to 2010. The estimated correlation between NDVI values and rainfall is 0.5 in Spearman Rank Correlation (moderate correlation). This research helps to understand the influences of drought events on ecosystem in Taiwan and also to evaluate the effects of drought under global change on vegetation growth in Taiwan.

Original languageEnglish
Title of host publication33rd Asian Conference on Remote Sensing 2012, ACRS 2012
Pages2629-2634
Number of pages6
Publication statusPublished - 2012 Dec 1
Event33rd Asian Conference on Remote Sensing 2012, ACRS 2012 - Pattaya, Thailand
Duration: 2012 Nov 262012 Nov 30

Publication series

Name33rd Asian Conference on Remote Sensing 2012, ACRS 2012
Volume3

Other

Other33rd Asian Conference on Remote Sensing 2012, ACRS 2012
CountryThailand
CityPattaya
Period12-11-2612-11-30

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All Science Journal Classification (ASJC) codes

  • Information Systems

Cite this

Wang, S. F., & Lee, M. F. (2012). A study of the drought impact on vegetation and its spatial variation in Taiwan. In 33rd Asian Conference on Remote Sensing 2012, ACRS 2012 (pp. 2629-2634). (33rd Asian Conference on Remote Sensing 2012, ACRS 2012; Vol. 3).