Satellite data as indicators of tree biomass growth and forest dieback in a Mediterranean holm oak forest

Romà Ogaya, Adrià Barbeta, Corina Başnou, Josep Peñuelas

    Research output: Contribution to journalArticleResearchpeer-review

    35 Citations (Scopus)

    Abstract

    © 2014, INRA and Springer-Verlag France. • Context: In the framework of climate change, decreased tree growth and enhanced mortality induced by hot and dry conditions are increasing in many forests around the world, and particularly in Mediterranean forests.• Aims: Our aim was to estimate tree growth and mortality in a Mediterranean holm oak forest, using remote sensing data from MODIS.• Methods: We monitored annual increases of aboveground biomass by measuring tree basal area, and we determined tree mortality by counting dead stems. We analyzed the relationships between forest growth and mortality with mean annual values of some MODIS products and meteorological data.• Results: Mortality and increases of aboveground biomass correlated well with precipitation, September standardized precipitation/evapotranspiration indices (SPEI), and some MODIS products such as NDVI and enhanced vegetation index EVI. Other MODIS products such as gross primary production (GPP) and net photosynthesis, however, showed no clear relationship with tree mortality or measured increases of biomass.• Conclusion: The MODIS products as proxies of ecosystemic productivity (gross primary productivity, net photosynthesis) were weakly correlated with biomass increase, and did not reflect the mortality following the drought of autumn 2011. Nevertheless, NDVI and EVI were efficient indicators of forest productivity and dieback.
    Original languageEnglish
    Pages (from-to)135-144
    JournalAnnals of Forest Science
    Volume72
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2015

    Keywords

    • Forest productivity
    • Mediterranean forest
    • MODIS
    • Remote sensing
    • SPEI indices
    • Tree mortality

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