A moving target: trade‐offs between maximizing carbon and minimizing hydraulic stress for plants in a changing climate DOI Creative Commons
Gregory R. Quetin, Leander D. L. Anderegg, Indra Boving

et al.

New Phytologist, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 26, 2024

Summary Observational evidence indicates that tree leaf area may acclimate in response to changes water availability alleviate hydraulic stress. However, the underlying mechanisms driving and consequences of different allocation strategies remain unknown. Here, we use a trait‐based hydraulically enabled model with two endmember strategies, aimed at either maximizing carbon gain or moderating We examined impacts these on future plant stress productivity. Allocating maximize increased productivity high CO 2 , but systematically Following an strategy avoid missed out 26% potential net primary some geographies. Both resulted decreases under climate scenarios, contrary Earth system (ESM) predictions. Leaf acclimation (and potentially risk accelerated mortality) was possible, led reduced gain. Accounting for effects canopy ESMs could limit reverse current projections increases area, cycles, surface energy budgets.

Language: Английский

Improving hydrological modeling to close the gap between elevated CO2 concentration and crop response: implications for water resources DOI
Na Wen,

Yiwen Han,

Junyu Qi

et al.

Water Research, Journal Year: 2024, Volume and Issue: 265, P. 122279 - 122279

Published: Aug. 14, 2024

Language: Английский

Citations

2
Global terrestrial nitrogen uptake and nitrogen use efficiency DOI Creative Commons
Yunke Peng, I. Colin Prentice, Keith J. Bloomfield

et al.

Journal of Ecology, Journal Year: 2023, Volume and Issue: 111(12), P. 2676 - 2693

Published: Oct. 18, 2023

Abstract Plant biomass production (BP), nitrogen uptake ( N up ) and their ratio, use efficiency (NUE) must be quantified to understand how (N) cycling constrains terrestrial carbon (C) uptake. But the controls of key plant processes determining NUE, including BP, C allocation, tissue C:N ratios resorption (NRE), remain poorly known. We compiled measurements from 804 forest grassland sites derived regression models for each these with growth temperature, vapour pressure deficit, stand age, soil fAPAR (remotely sensed fraction photosynthetically active radiation absorbed by green vegetation) growing‐season average daily incident photosynthetic photon flux density (gPPFD; effectively seasonal concentration light availability, which increases polewards) as predictors. An empirical model leaf was based on optimal capacity (a function gPPFD climate) observed mass per area. The were used produce global maps NUE. Global BP estimated 72 Pg C/year; 950 Tg N/year; NUE 76 g C/g N. Forest found increase temperature decrease ratio gPPFD. is controlled primarily climate through its effect allocation—especially leaves, being richer in than other tissues. greater colder climates, where less readily available, because below‐ground allocation increased. also drier climates reduced. NRE enhanced (further promoting NUE) both cold dry climates. Synthesis . These findings can provide observationally benchmarks representations C–N cycle coupling. State‐of‐the‐art vegetation TRENDY ensemble showed variable performance against benchmarks, coupled produced relatively poor simulations

Language: Английский

Citations

5
Flexible Foliar Stoichiometry Reduces the Magnitude of the Global Land Carbon Sink DOI Creative Commons
Emma Hauser, William R. Wieder, Gordon B. Bonan

et al.

Geophysical Research Letters, Journal Year: 2023, Volume and Issue: 50(21)

Published: Nov. 6, 2023

Abstract Increased plant growth under elevated carbon dioxide (CO 2 ) slows the pace of climate warming and underlies projections terrestrial (C) dynamics. However, this important ecosystem service may be diminished by concurrent changes to vegetation carbon‐to‐nitrogen (C:N) ratios. Despite clear observational evidence increasing foliar C:N CO , our understanding potential ecological consequences stoichiometric flexibility is incomplete. Here, we illustrate that when incorporated ‐driven increases in stoichiometry into Community Land Model projected land C sink decreased two‐fold end century compared simulations with fixed chemistry. Further, profoundly altered Earth's hydrologic cycle, reducing evapotranspiration runoff, reduced belowground N cycling rates. These findings underscore urgency further research examine both direct indirect effects changing on soil productivity.

Language: Английский

Citations

5
Declining global sensitivity of stomatal conductance to photosynthesis DOI Creative Commons
Jiye Leng, Jing M. Chen, Wenyu Li

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 5, 2024

Abstract Terrestrial ecosystems play a pivotal role in mitigating climate change through photosynthesis and transpiration regulated by plant stomata. biosphere models (TBMs) commonly couple biochemical model, i.e., the Farquhar semi-empirical stomatal conductance Ball-Berry to estimate gross primary productivity (GPP) evapotranspiration (ET). However, key ecosystem parameters (i.e., maximum carboxylation rate Vcmax slope m) are prescribed as constant TBMs, hindering accurate quantification of global GPP ET. m depicts ‘compromise between costs benefits relative photosynthetic activity leaf’, namely sensitivity photosynthesis. although recent work has retrieved continuous seasonal V_cmax over globe, there is lack an effective method derive spatially temporally explicit TBMs. In this study, we estimated monthly Bayesian parameter optimization approach at 136 eddy covariance flux sites (809 site years) upscaled site-level gridded during 2001-2020 via machine learning model. We found significant declining trend (R2 = 0.72, P < 0.001) 2001-2020. largest decline grassland (0.04 per year), moderate declines deciduous broadleaf forests, mixed cropland (0.02 smallest evergreen needleleaf forests savannas (0.01 year). air temperature plays predominant driving m. This study generates analyzes timeseries ‘handshaking’ measured fluxes, terrestrial models, remote sensing. Our results highlight changing relationship under identify importance incorporating dynamic future ET simulations with models.

Language: Английский

Citations

1
A moving target: trade‐offs between maximizing carbon and minimizing hydraulic stress for plants in a changing climate DOI Creative Commons
Gregory R. Quetin, Leander D. L. Anderegg, Indra Boving

et al.

New Phytologist, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 26, 2024

Summary Observational evidence indicates that tree leaf area may acclimate in response to changes water availability alleviate hydraulic stress. However, the underlying mechanisms driving and consequences of different allocation strategies remain unknown. Here, we use a trait‐based hydraulically enabled model with two endmember strategies, aimed at either maximizing carbon gain or moderating We examined impacts these on future plant stress productivity. Allocating maximize increased productivity high CO 2 , but systematically Following an strategy avoid missed out 26% potential net primary some geographies. Both resulted decreases under climate scenarios, contrary Earth system (ESM) predictions. Leaf acclimation (and potentially risk accelerated mortality) was possible, led reduced gain. Accounting for effects canopy ESMs could limit reverse current projections increases area, cycles, surface energy budgets.

Language: Английский

Citations

1