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Recent trends in vegetation dynamics in the South America and their relationship to rainfall

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  • H. Barbosa
  • T. Lakshmi Kumar
  • L. Silva

Abstract

This research investigates spatial patterns of Normalized Difference Vegetation Index (NDVI) and rainfall variability in South America and their relationships based on analyses of the Standardized Difference Vegetation Index (SDVI) and the Standardized Precipitation Index (SPI) for the period April 1998–March 2012. The time series of SPOT-Vegetation 10-daily composite NDVI data at 1-km resolution was smoothed and subsequently synthesized to monthly images using the maximum value composite technique. Furthermore, 10-daily rainfall estimates at 0.25° resolution, available from the European Centre for Medium-Range Weather Forecasts through MeteoConsult and the Monitoring Agricultural ResourceS unit, were combined to retrieve monthly composites. In order to assess spatial patterns and rates of change, linear least squares trend analyses were performed on the SDVI time series and the SPI time series, taking into account the accumulated rainfall over the respective best lag. Only trends with Pearson’s correlation coefficients significantly different from zero (p > 0.05) were considered significant. The results indicated that vegetation degradation is coupled to a significant decrease in the amount of rainfall in the last 14 years in 8 % of South America’s area. In contrast, in 18 % of the subcontinental area, vegetation greenness has significantly increased over the last 14 years, coupled to an increase in rainfall. For 46 % of the study area, significant degradation or greening processes could not be linked to changes in rainfall over time, indicating human impact or the influence of other climatic factors, such as temperature and net radiation. Copyright Springer Science+Business Media Dordrecht 2015

Suggested Citation

  • H. Barbosa & T. Lakshmi Kumar & L. Silva, 2015. "Recent trends in vegetation dynamics in the South America and their relationship to rainfall," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 77(2), pages 883-899, June.
    • Handle: RePEc:spr:nathaz:v:77:y:2015:i:2:p:883-899
    DOI: 10.1007/s11069-015-1635-8
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    References listed on IDEAS

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    1. Humberto Alves Barbosa & T. V. Lakshmi Kumar & T. V. Lakshmi Kumar, 2012. "Strengthening Regional Capacities for Providing Remote Sensing Decision Support in Drylands in the Context of Climate Variability and Change," Chapters, in: Stephen Young & Steven Silvern (ed.), International Perspectives on Global Environmental Change, IntechOpen.
    2. R. B. Myneni & C. D. Keeling & C. J. Tucker & G. Asrar & R. R. Nemani, 1997. "Increased plant growth in the northern high latitudes from 1981 to 1991," Nature, Nature, vol. 386(6626), pages 698-702, April.
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    2. Florence M. Murungweni & Onisimo Mutanga & John O. Odiyo, 2020. "Rainfall Trend and Its Relationship with Normalized Difference Vegetation Index in a Restored Semi-Arid Wetland of South Africa," Sustainability, MDPI, vol. 12(21), pages 1-22, October.
    3. Franklin Paredes-Trejo & Humberto Alves Barbosa & Gabriel Antunes Daldegan & Ingrid Teich & César Luis García & T. V. Lakshmi Kumar & Catarina de Oliveira Buriti, 2023. "Impact of Drought on Land Productivity and Degradation in the Brazilian Semiarid Region," Land, MDPI, vol. 12(5), pages 1-19, April.
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    5. Gilsonley Lopes Santos & Marcos Gervasio Pereira & Rafael Coll Delgado & José Luiz Rodrigues Torres & Matheus Duarte Silva Cravo & Antônio Carlos Barreto & Iris Cristiane Magistrali, 2020. "Evaluation of natural regeneration and recovery of environmental services in a watershed in the Cerrado-Brazil," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 22(6), pages 5571-5583, August.
    6. Glauciene Justino Ferreira da Silva & Nádja Melo Oliveira & Celso Augusto Guimarães Santos & Richarde Marques Silva, 2020. "Spatiotemporal variability of vegetation due to drought dynamics (2012–2017): a case study of the Upper Paraíba River basin, Brazil," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 102(3), pages 939-964, July.
    7. David Marcolino Nielsen & Marcio Cataldi & André Luiz Belém & Ana Luiza Spadano Albuquerque, 2016. "Local indices for the South American monsoon system and its impacts on Southeast Brazilian precipitation patterns," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 83(2), pages 909-928, September.

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