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Changes in biomass allocation buffer low CO2 effects on tree growth during the last glaciation

AbstractIsotopic measurements on junipers growing in southern California during the last glacial, when the ambient atmospheric [CO2] (ca) was ~180 ppm, show the leaf-internal [CO2] (ci) was approaching the modern CO2compensation point for C3plants. Despite this, stem growth rates were similar to today. Using a coupled light-use efficiency and tree growth model, we show that it is possible to maintain a stable ci/caratio because both vapour pressure deficit and temperature were decreased under glacial conditions at La Brea, and these have compensating effects on the ci/caratio. Reduced photorespiration at lower temperatures would partly mitigate the effect of low cion gross primary production, but maintenance of present-day radial growth also requires a ~27% reduction in the ratio of fine root mass to leaf area. Such a shift was possible due to reduced drought stress under glacial conditions at La Brea. The necessity for changes in allocation in response to changes in [CO2] is consistent with increased below-ground allocation, and the apparent homoeostasis of radial growth, as caincreases today.
- Deparment of Biological Sciences Faculty of Science Macquarie University Australia
- University of Kansas United States
- Department of Ecology and Evolutionary Biology University of Arizona United States
- University of Kansas Libraries United States
- Arkansas State University United States
570, ELEVATED ATMOSPHERIC CO2, 550, Climate, RING CHRONOLOGIES, BREA TAR PITS, Models, Biological, Article, California, Trees, Models, FINE-ROOT DYNAMICS, Biomass, Plant ecology, Ecological modelling, 580, Science & Technology, Palaeoecology, Carbon Dioxide, Biological, FOREST, C-4 GRASSES, Multidisciplinary Sciences, CLIMATE, Science & Technology - Other Topics, Forest ecology, WATER-USE EFFICIENCY, CARBON ALLOCATION, RESPONSES
570, ELEVATED ATMOSPHERIC CO2, 550, Climate, RING CHRONOLOGIES, BREA TAR PITS, Models, Biological, Article, California, Trees, Models, FINE-ROOT DYNAMICS, Biomass, Plant ecology, Ecological modelling, 580, Science & Technology, Palaeoecology, Carbon Dioxide, Biological, FOREST, C-4 GRASSES, Multidisciplinary Sciences, CLIMATE, Science & Technology - Other Topics, Forest ecology, WATER-USE EFFICIENCY, CARBON ALLOCATION, RESPONSES
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