Coupling carbon allocation with leaf and root phenology predicts tree–grass partitioning along a savanna rainfall gradient

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Haverd, V. (author)

Coupling carbon allocation with leaf and root phenology predicts tree–grass partitioning along a savanna rainfall gradient

Article/chapterEnglish2016

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2016-02-11
Copernicus GmbH,2016

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LIBRIS-ID:oai:lup.lub.lu.se:4c785d94-bacf-432d-a2f1-1f7681111975
https://lup.lub.lu.se/record/8626884URI
https://doi.org/10.5194/bg-13-761-2016DOI

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Language:English
Summary in:English

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The relative complexity of the mechanisms underlying savanna ecosystem dynamics, in comparison to other biomes such as temperate and tropical forests, challenges the representation of such dynamics in ecosystem and Earth system models. A realistic representation of processes governing carbon allocation and phenology for the two defining elements of savanna vegetation (namely trees and grasses) may be a key to understanding variations in tree–grass partitioning in time and space across the savanna biome worldwide. Here we present a new approach for modelling coupled phenology and carbon allocation, applied to competing tree and grass plant functional types. The approach accounts for a temporal shift between assimilation and growth, mediated by a labile carbohydrate store. This is combined with a method to maximize long-term net primary production (NPP) by optimally partitioning plant growth between fine roots and (leaves + stem). The computational efficiency of the analytic method used here allows it to be uniquely and readily applied at regional scale, as required, for example, within the framework of a global biogeochemical model. We demonstrate the approach by encoding it in a new simple carbon–water cycle model that we call HAVANA (Hydrology and Vegetation-dynamics Algorithm for Northern Australia), coupled to the existing POP (Population Orders Physiology) model for tree demography and disturbance-mediated heterogeneity. HAVANA-POP is calibrated using monthly remotely sensed fraction of absorbed photosynthetically active radiation (fPAR) and eddy-covariance-based estimates of carbon and water fluxes at five tower sites along the North Australian Tropical Transect (NATT), which is characterized by large gradients in rainfall and wildfire disturbance. The calibrated model replicates observed gradients of fPAR, tree leaf area index, basal area, and foliage projective cover along the NATT. The model behaviour emerges from complex feedbacks between the plant physiology and vegetation dynamics, mediated by shifting above- versus below-ground resources, and not from imposed hypotheses about the controls on tree–grass co-existence. Results support the hypothesis that resource limitation is a stronger determinant of tree cover than disturbance in Australian savannas.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng

Added entries (persons, corporate bodies, meetings, titles ...)

Smith, B.Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science(Swepub:lu)ple-bsm (author)
Raupach, M. (author)
Briggs, P. (author)
Nieradzik, L.CSIRO Oceans and Atmosphere, Canberra(Swepub:lu)nate-lni (author)
Beringer, Jason (author)
Hutley, Lindsay B. (author)
Trudinger, C. M. (author)
Cleverly, J. (author)
BECC: Biodiversity and Ecosystem services in a Changing ClimateCentrum för miljö- och klimatvetenskap (CEC) (creator_code:org_t)

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In:Biogeosciences: Copernicus GmbH13:3, s. 761-7791726-4189

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By the author/editor: Haverd, V.; Smith, B.; Raupach, M.; Briggs, P.; Nieradzik, L.; Beringer, Jason; show more...; Hutley, Lindsay ...; Trudinger, C. M.; Cleverly, J.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...

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By the university: Lund University

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