Journal
NATURE CLIMATE CHANGE
Volume 7, Issue 4, Pages 279-+Publisher
NATURE RESEARCH
DOI: 10.1038/NCLIMATE3235
Keywords
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Funding
- Australian Commonwealth
- Western Sydney University
- Australian Research Council (ARC) [DP110105102, DP160102452]
- ARC
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Rising atmospheric CO2 stimulates photosynthesis and productivity of forests, offsetting CO2 emissions1,2. Elevated CO2 experiments in temperate planted forests yielded similar to 23% increases in productivity(3) over the initial years. Whether similar CO2 stimulation occurs in mature evergreen broadleaved forests on low-phosphorus (P) soils is unknown, largely due to lack of experimental evidence(4). This knowledge gap creates major uncertainties in future climate projections(5,6) as a large part of the tropics is P-limited. Here, we increased atmospheric CO2 concentration in a mature broadleaved evergreen eucalypt forest for three years, in the first large-scale experiment on a P-limited site. We show that tree growth and other aboveground productivity components did not significantly increase in response to elevated CO2 in three years, despite a sustained 19% increase in leaf photosynthesis. Moreover, tree growth in ambient CO2 was strongly P-limited and increased by similar to 35% with added phosphorus. The findings suggest that P availability may potentially constrain CO2-enhanced productivity in P-limited forests; hence, future atmospheric CO2 trajectories may be higher than predicted by some models. As a result, coupled climate-carbon models should incorporate both nitrogen and phosphorus limitations to vegetation productivity(7) in estimating future carbon sinks.
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