Responses to cold temperature determine clinal patterns of photosynthetic acclimation of a cosmopolitan grass genus and challenge the concept of quantifying phenotypic plasticity

Functional Ecology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 6, 2025

Abstract Climate warming and associated extreme temperature fluctuations result in rapid pronounced changes the biogeographical ranges of species. However, existing models that predict these climate‐driven range dynamics often fail to adequately account for intricacies local adaptation individual specialization, treating species as having uniform responses without accounting variability. This oversight highlights need enhance our understanding evolutionary implications intraspecific intrageneric variability, particularly with respect photosynthetic acclimation plants. To explore how widespread plant adapt we used cosmopolitan genus Phragmites a model. We assessed variance–covariance matrix gene‐based traits quantify genetic variability examine correlations among acclimatization thermal gradient includes low‐, moderate‐, high‐temperature regimes. Our findings revealed clinal variations, exemplified by increased robustness plants from lower latitudes, were closely related latitudinal origins genotypes manifested more prominently cooler environments. Furthermore, coordination integrated physiological traits, aimed at preserving whole fitness, exhibits heightened response under cold stress. observed plasticity did not increase latitude regions high climatic seasonality, indicating deviation expected patterns. finding prompted re‐evaluation phenotypic plasticity. improved variation strategies species, refining predictions responses, survival, distribution amidst global climate change. Read free Plain Language Summary this article on Journal blog.

Language: Английский

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Principles for satellite monitoring of vegetation carbon uptake

Nature Reviews Earth & Environment, Journal Year: 2024, Volume and Issue: 5(11), P. 818 - 832

Published: Oct. 29, 2024

Language: Английский

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Night-time decline in plant respiration is consistent with substrate depletion

Communications Earth & Environment, Journal Year: 2024, Volume and Issue: 5(1)

Published: March 22, 2024

Abstract Understanding the response of plant respiration to climate change is key determining whether global land carbon sink continues into future or declines. Most vegetation models use a classical growth-maintenance approach, which predicts that nocturnal controlled by temperature only. However, recently published observations show decline through night even at constant temperature, these cannot reproduce. Here we assess role respiratory substrates in this observed evaluating an alternative model respiration, rate instead dependent on size available substrate pools. We find reproduced with just two pools, one fast and slow. These results demonstrate need way represented models, moving based labile pools represent only fraction total biomass. naturally acclimation via changing pool-sizes may have significant impact long-term predictions sink.

Language: Английский

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Constraining Light‐Driven Plasticity in Leaf Traits With Observations Improves the Prediction of Tropical Forest Demography, Structure, and Biomass Dynamics

Journal of Geophysical Research Biogeosciences, Journal Year: 2025, Volume and Issue: 130(6)

Published: May 28, 2025

Abstract Predicting tropical tree demography is a key challenge in understanding the future dynamics of forests. Although demographic processes are known to be regulated by leaf trait diversity, only effect inter‐specific variation has been evaluated, and it remains unclear as what degree intra‐specific plasticity across light gradients (hereafter plasticity) regulates demography, how this will further shape long‐term community ecosystem dynamics. By combining situ measurements forest census data with terrestrial biosphere model, we evaluated impact observation‐constrained on structure, biomass Panamanian moist forest. Modeled physiological traits vary within plant functional types (PFT), which represent plasticity, respectively. The simulation using three non‐plastic PFTs underestimated 20‐year average understory growth rates 41%, leading biased size structure area profile, 44% underestimate biomass. plastic generated accurate rates, resulting realistic smaller 15%. Expanding simulated diversity 18 nonplastic similarly improved prediction However, plasticity‐enabled model predicted PFT composition within‐canopy profiles. Our results highlight distinct role regulating that cannot replaced diversity. Accurately representing thus crucial for trait‐based

Language: Английский

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Leaf day respiration: More than just catabolic CO₂ production in the light

Plant Cell & Environment, Journal Year: 2024, Volume and Issue: 47(7), P. 2629 - 2637

Published: March 25, 2024

Summary statement Day respiration is a net flux resulting from several CO 2 ‐generating and ‐fixing reactions, not only related to catabolism but also anabolism. We review pieces of evidence that decarboxylating reactions are partly fed by carbon sources disconnected current photosynthesis how they reflect various metabolic pathways.

Language: Английский

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Incorporating the Acclimation of Photosynthesis and Leaf Respiration in the Noah‐MP Land Surface Model: Model Development and Evaluation

Journal of Advances in Modeling Earth Systems, Journal Year: 2025, Volume and Issue: 17(3)

Published: March 1, 2025

Abstract Realistic simulation of leaf photosynthetic and respiratory processes is needed for accurate prediction the global carbon cycle. These two systematically acclimate to long‐term environmental changes by adjusting traits (e.g., maximum capacity at 25°C ( V cmax,25 ) respiration rate R 25 )) following increasingly well‐understood principles. While some land surface models (LSMs) now account thermal acclimation, they do so assigning empirical parameterizations individual plant functional types (PFTs). Here, we have implemented an Eco‐Evolutionary Optimality (EEO)‐based scheme represent universal acclimation photosynthesis multiple effects, that therefore requires no PFT‐specific parameterizations, in a standard version widely used LSM, Noah MP. We evaluated model performance with trait data from 5‐year experiment extensive field measurements, flux measurements FLUXNET2015. show observed vary substantially both temporally spatially within same PFT C.V. >20%). Our EEO‐based captures 62% temporal 70% spatial variations (73% 54% ). The underestimates gross primary production 10% versus 2% generates larger spread r (correlation coefficient) across sites (0.79 ± 0.16 vs. 0.84 0.1, mean S.D.). greatly overestimates canopy (bias: ∼200% 8% EEO scheme), resulting less CO 2 uptake terrestrial ecosystems. approach thus simulates climate‐carbon coupling more realistically, fewer parameters.

Language: Английский

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Climate and Vegetation‐Driven Increase of Soil Heterotrophic and Autotrophic Respiration in China's Subtropical Forests Over 2000–2020

Global Biogeochemical Cycles, Journal Year: 2025, Volume and Issue: 39(4)

Published: April 1, 2025

Abstract Soil respiration significantly counteracts the carbon sequestration of forest ecosystems, but large uncertainties remain in quantifying its components including heterotrophic (HR) and autotrophic (AR). We used previously collected field data from subtropical forests southern China, developed independent models for HR AR. The model incorporated regulation substrate quantity quality co‐limitations soil temperature moisture on microbe activity. AR considered fine root biomass productivity as substrates effects Using high‐quality forcing new models, we estimated this region over 2000–2020 with 8‐day timescale 1 km spatial resolution. Validation showed improved accuracy compared previous estimates. annual at 523 ± 381 g C m −2 yr −1 254 112 (values represent mean SD). While estimates align well our results, are generally higher. Our exhibited more detailed patterns than existing sets, particularly along altitudinal gradients, significant increasing trends both driven by warming greening, especially high‐rate during summer season. was main driver interannual variation cold environments, while leaf area index mainly contributed to that most regions. results provide critical constraints enhance understanding their contributions spatiotemporal under a changing climate.

Language: Английский

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Extreme Climate Change, Rainfall and Temperature in South Kalimantan Province, Indonesia

Journal of Lifestyle and SDGs Review, Journal Year: 2025, Volume and Issue: 5(4), P. 06136 - 06136

Published: April 7, 2025

Objective: This study investigates extreme changes rainfall and temperature in South Kalimantan Province, Indonesia the impact of these climate changes, related to SDG 13 (climate action) 15 (Life on land). Theoretical Framework: Tropical regions such as are characterized by a warm throughout year large variations between regions. On island Borneo there three countries, namely Indonesia, Malaysia Brunei Darussalam. As country with tropical climate, only experiences two seasons year. Method: Climatology data collect from BMKG database center which is 3 Stations, Gusti Syamsir Alam Meteorological Station (1982-2022), Syamsudin Noor (1978-2022) (2010-2022). Results Discussion: There have been significant over past 40 years. The maximum daily occurred 2021 amounting 255.3 mm. In January 2021, floods hit almost all districts Province. that month it rained consecutively for 7 days totaling 628.6 mm 10th-16th 2021. average 26.7ºC, increase 1ºC highest was 38.8ºC, 2-5ºC. Research Implications: lungs world, so will also an global change. Originality/Value: uniquely examines change Borneo, particularly temperature.

Language: Английский

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Acclimation to Warming Shapes Gas Exchange and Metabolic Responses to Heat Shock in Pinus massoniana Seedlings

Physiologia Plantarum, Journal Year: 2025, Volume and Issue: 177(3)

Published: May 1, 2025

ABSTRACT The sensitivity of physiological and metabolic processes in subtropical trees to temperature remains uncertain, limiting our ability predict how forests will acclimate future climates. In particular, understanding gas exchange activity responses warming heat shocks is quite limited. Here, we exposed Pinus massoniana seedlings three daytime growth temperatures (25°C, 3°C, 35°C) for 65 days, followed by a shock up 40°C, then immediately reduced 25°C, investigate responses. optimal photosynthesis ( T optA ) did not exhibit significant shift with warming. Metabolism acclimated rising temperature, resulting enriched levels key metabolites (tryptophan, indole, indoleacetate, o‐Phospho‐L‐serine) pathways (tryptophan metabolism). At leaf dark respiration R d decreased warm‐grown seedlings. 40°C (heat period), , accumulated flavonoid metabolites, upregulated tryptophan metabolism. After recovery higher the net photosynthetic rate A sat ), prenol lipid led enrichment metabolism, flavone, flavonol biosynthesis pathways. Our findings suggest that P. exhibits limited thermal acclimation, while metabolism can under short‐term However, acclimation altered both during subsequent phase

Language: Английский

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Thermal acclimation of stem respiration implies a weaker carbon-climate feedback

Science, Journal Year: 2025, Volume and Issue: 388(6750), P. 984 - 988

Published: May 29, 2025

The efflux of carbon dioxide (CO 2 ) from woody stems, a proxy for stem respiration, is critical flux ecosystems to the atmosphere, which increases with temperature on short timescales. However, plants acclimate their respiratory response longer timescales, potentially weakening carbon-climate feedback. magnitude this acclimation uncertain despite its importance predicting future climate change. We develop an optimality-based theory dynamically linking respiration leaf water supply predict thermal acclimation. show that accurately reproduces observations spatial and seasonal estimate global value current annual CO as 27.4 ± 5.9 PgC. By 2100, incorporating reduces projected without considering by 24 46%, thus reducing land ecosystem emissions.

Language: Английский

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