Reviews and syntheses : Australian vegetation phenology: New insights from satellite remote sensing and digital repeat photography
| Autor: | Albert van Dijk, Alison Specht, Eva van Gorsel, Caitlin E. Moore, Remko A. Duursma, Trevor F. Keenan, Jeffrey R. Taylor, Stefan W. Maier, Lindsay B. Hutley, Alfredo Huete, Jason Beringer, Timothy Brown, Oliver Sonnentag, Bradley Evans, Darius Culvenor, Michael J. Liddell, Natalia Restrepo-Coupe |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
010504 meteorology & atmospheric sciences Biome lcsh:Life Rainforest Temperate deciduous forest 010603 evolutionary biology 01 natural sciences lcsh:QH540-549.5 Meteorology & Atmospheric Sciences Life Science Ecosystem Ecology Evolution Behavior and Systematics 04 Earth Sciences 05 Environmental Sciences 06 Biological Sciences 0105 earth and related environmental sciences Earth-Surface Processes Ecology Phenology lcsh:QE1-996.5 Vegetation Enhanced vegetation index Biological Sciences Evergreen lcsh:Geology lcsh:QH501-531 Geography Earth Sciences lcsh:Ecology Environmental Sciences |
| Zdroj: | Biogeosciences, 13(17), 5085-5102 Biogeosciences 13 (2016) 17 Biogeosciences, vol 13, iss 17 Moore, CE; Brown, T; Keenan, TF; Duursma, RA; Van Dijk, AIJM; Beringer, J; et al.(2016). Reviews and syntheses: Australian vegetation phenology: New insights from satellite remote sensing and digital repeat photography. Biogeosciences, 13(17), 5085-5102. doi: 10.5194/bg-13-5085-2016. UC Berkeley: Retrieved from: http://www.escholarship.org/uc/item/44m681nw Biogeosciences, Vol 13, Iss 17, Pp 5085-5102 (2016) |
| ISSN: | 1726-4170 |
| Popis: | Phenology is the study of periodic biological occurrences and can provide important insights into the influence of climatic variability and change on ecosystems. Understanding Australia's vegetation phenology is a challenge due to its diverse range of ecosystems, from savannas and tropical rainforests to temperate eucalypt woodlands, semi-arid scrublands, and alpine grasslands. These ecosystems exhibit marked differences in seasonal patterns of canopy development and plant life-cycle events, much of which deviates from the predictable seasonal phenological pulse of temperate deciduous and boreal biomes. Many Australian ecosystems are subject to irregular events (i.e. drought, flooding, cyclones, and fire) that can alter ecosystem composition, structure, and functioning just as much as seasonal change. We show how satellite remote sensing and ground-based digital repeat photography (i.e. phenocams) can be used to improve understanding of phenology in Australian ecosystems. First, we examine temporal variation in phenology on the continental scale using the enhanced vegetation index (EVI), calculated from MODerate resolution Imaging Spectroradiometer (MODIS) data. Spatial gradients are revealed, ranging from regions with pronounced seasonality in canopy development (i.e. tropical savannas) to regions where seasonal variation is minimal (i.e. tropical rainforests) or high but irregular (i.e. arid ecosystems). Next, we use time series colour information extracted from phenocam imagery to illustrate a range of phenological signals in four contrasting Australian ecosystems. These include greening and senescing events in tropical savannas and temperate eucalypt understorey, as well as strong seasonal dynamics of individual trees in a seemingly static evergreen rainforest. We also demonstrate how phenology links with ecosystem gross primary productivity (from eddy covariance) and discuss why these processes are linked in some ecosystems but not others. We conclude that phenocams have the potential to greatly improve the current understanding of Australian ecosystems. To facilitate the sharing of this information, we have formed the Australian Phenocam Network (http://phenocam.org.au/). |
| Databáze: | OpenAIRE |
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