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Decadal biomass increment in early secondary succession woody ecosystems is increased by CO2 enrichment
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Decadal biomass increment in early secondary succession woody ecosystems is increased by CO2 enrichment
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Journal Article
Decadal biomass increment in early secondary succession woody ecosystems is increased by CO2 enrichment
2019
Overview
Increasing atmospheric CO
2
stimulates photosynthesis which can increase net primary production (NPP), but at longer timescales may not necessarily increase plant biomass. Here we analyse the four decade-long CO
2
-enrichment experiments in woody ecosystems that measured total NPP and biomass. CO
2
enrichment increased biomass increment by 1.05 ± 0.26 kg C m
−2
over a full decade, a 29.1 ± 11.7% stimulation of biomass gain in these early-secondary-succession temperate ecosystems. This response is predictable by combining the CO
2
response of NPP (0.16 ± 0.03 kg C m
−2
y
−1
) and the CO
2
-independent, linear slope between biomass increment and cumulative NPP (0.55 ± 0.17). An ensemble of terrestrial ecosystem models fail to predict both terms correctly. Allocation to wood was a driver of across-site, and across-model, response variability and together with CO
2
-independence of biomass retention highlights the value of understanding drivers of wood allocation under ambient conditions to correctly interpret and predict CO
2
responses.
It is unclear whether CO
2
-stimulation of photosynthesis can propagate through slower ecosystem processes and lead to long-term increases in terrestrial carbon. Here the authors show that CO
2
-stimulation of photosynthesis leads to a 30% increase in forest regrowth over a decade of CO
2
enrichment.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
