Elevated CO2 does not increase eucalypt forest productivity on a low-phosphorus soil
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Citations
Impacts of 1.5°C Global Warming on Natural and Human Systems
Plant carbon metabolism and climate change: elevated CO2 and temperature impacts on photosynthesis, photorespiration and respiration.
Pervasive shifts in forest dynamics in a changing world
Carbon-concentration and carbon-climate feedbacks in CMIP5 Earth system models
Nitrogen and phosphorus constrain the CO2 fertilization of global plant biomass
References
Nutrient limitation reduces land carbon uptake in simulations with a model of combined carbon, nitrogen and phosphorus cycling
Progressive nitrogen limitation of ecosystem processes under elevated co2 in a warm-temperate forest
Decade-long soil nitrogen constraint on the CO2 fertilization of plant biomass
Resilience of Amazon forests emerges from plant trait diversity
Incorporating phosphorus cycling into global modeling efforts: a worthwhile, tractable endeavor
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Frequently Asked Questions (14)
Q2. How was the CO2 effect size calculated?
379 Confidence intervals for the CO2 effect size estimate were computed in R (http://cran.r-380 project.org) using the function ‘confint’, which applies quantile functions for the t-381 distribution after model-fitting.
Q3. How many trees were measured across the ambient and elevated plots?
Of a total of 146 trees measured across the ambient and 353 elevated plots, 49 suppressed trees, 6 co-dominant trees with trunk defects, and 4 trees 354 showing shrinkage possibly preceding mortality were omitted from the mixed-model 355 analysis.
Q4. What is the mean of the ANPP in a mature Eucalyptus?
Stemwood 281 production is determined as the annual biomass increment, and foliage+fine twig production 282 are measured as annual biomass turnover collected monthly in permanent litter baskets.
Q5. What was the productivity of the leaf 367 component?
For the leaf 367 component, the productivity was computed as the sum of annual litterfall whilst for twigs the authors 368 assume strictly annual turnover across the three years.
Q6. What is the mean temperature in the warmest month?
Mean maximum temperature in the warmest month is 30°C and mean 319 minimum temperature in the coldest month is 3.6°C, with monthly mean temperatures always 320 > 10°C.
Q7. What was the effect of the CO2 on the tree crown?
A smaller set of 339measurements on shaded foliage within the tree crowns was used to confirm results from the 340 upper-crown measurements in terms of the CO2-enhancement effect on photosynthesis, thus 341 the entire crown can be expected to behave similarly.
Q8. How was the data checked for normality?
All data were checked for normality 386 using the Q-Q plots and Levene’s test, and residuals from model fitting were checked for 387 evidence of heteroscedasticity.
Q9. What is the mean response ratio for photosynthesis in a mature Eucalyptus?
The CO2 fertilisation response ratio for photosynthesis over time, 268 with grey areas representing two-sided 95% confidence intervals for the CO2 fertilisation 269 response ratio for each of the measurement timepoints.
Q10. What is the ANPP of the Eucalyptus?
Total ANPP is represented by the 279 combination of stemwood biomass production (stippled), fine twig and bark production 280(striped), seed and capsule production (hatched), and leaf production (solid).
Q11. How long did the eCO2 study last?
The P-addition treatments were 331 maintained through the duration of the study, resulting in 4 years of P-fertilisation concurrent 332 with the 3-year eCO2 study.
Q12. How was the diameter of each tree measured?
The diameter 345 of each tree was measured at 1.3 m height at approximately monthly intervals starting 346 February 2011, 2 years prior to commencement of the full CO2 treatment.
Q13. How many trees were measured across all years?
The authors thus used a total of N=87 trees measured across all years and without stem 356 defects, suppression or shrinkage in the mixed-model analyses.
Q14. how many datasets are available in a research data australia repository?
The datasets generated during and/or analysed during the current study are 390 available in a Research Data Australia repository (http://doi.org/10.4225/35/57ec5d4a2b78e).