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

Authors: John Harris; I. Colin Prentice; I. Colin Prentice; Guangqi Li; Guangqi Li; Laci M. Gerhart; Sandy P. Harrison; +2 Authors

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

Abstract

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.

Countries
United States, United States, United States, United Kingdom
Keywords

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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    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
3
Average
Average
Average
Green
gold