Interactive and unimodal relationships between plant biomass, abiotic factors, and plant diversity in global grasslands

Communications Biology, Journal Year: 2025, Volume and Issue: 8(1)

Published: Jan. 21, 2025

Abstract Grasslands cover approximately a third of the Earth’s land surface and account for about terrestrial carbon storage. Yet, we lack strong predictive models grassland plant biomass, primary source in grasslands. This ability may arise from assumption linear relationships between biomass environment an underestimation interactions environmental variables. Using data 116 grasslands on six continents, show unimodal ecosystem characteristics, such as mean annual precipitation soil nitrogen. Further, found that nitrogen diversity interacted their with were positively related at low levels negatively elevated Our results it is critical to interactive several variables accurately include global vegetation models.

Language: Английский

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Can Large‐Scale Satellite Products Track the Effects of Atmospheric Dryness and Soil Water Deficit on Ecosystem Productivity Under Droughts?

Geophysical Research Letters, Journal Year: 2025, Volume and Issue: 52(8)

Published: April 28, 2025

Abstract Drought stress, characterized by increased vapor pressure deficit (VPD) and soil water content (SWC) deficit, significantly impacts ecosystem productivity (GPP). Accurately assessing these factors in satellite remote sensing (RS) GPP products is crucial for understanding the large‐scale ecological consequences of drought. However, accuracy RS capturing effects VPD SWC compared to EC flux data, remains under‐investigated. Here we evaluated 10 their mean (RSmean) concerning across diverse ecosystems along a dryness gradient. Our results revealed that RSmean individual generally capture response direction (VPD: mainly negative, deficit: mixed positive/negative) but consistently misestimate absolute changes. This discrepancy ecosystem‐specific consistent all products, underscoring need enhance better account non‐linear responses, thereby improving under

Language: Английский

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Prolonged warming and drought reduce canopy‐level net carbon uptake in beech and oak saplings despite photosynthetic and respiratory acclimation

New Phytologist, Journal Year: 2025, Volume and Issue: unknown

Published: April 3, 2025

Tree net carbon (C) uptake may decrease under global warming, as higher temperatures constrain photosynthesis while simultaneously increasing respiration. Thermal acclimation might mitigate this negative effect, but its capacity to do so concurrent soil drought remains uncertain. Using a 5-yr open-top chamber experiment, we determined of leaf-level (thermal optimum Topt and rate Aopt) respiration (rate at 25°C R25 thermal sensitivity Q10) chronic +5°C drought, their combination in beech (Fagus sylvatica L.) oak (Quercus pubescens Willd.) saplings. Process-based modeling was used evaluate impacts on canopy-level C (Atot). Prolonged warming increased by 3.03-2.66°C, only 1.58-0.31°C when combined with slightly reduced Q10. By contrast, (-1.93°C oak), Aopt (c. 50%), Q10 (in beech). Mainly because leaf area, Atot decreased 47-84% beech) without additive effects combined. Our results suggest that, despite photosynthetic respiratory will decline persistently hotter drier climate, primarily due the prevalent impact area reduction.

Language: Английский

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The New Phytologist Tansley Medal 2024 – Matthew Naish

New Phytologist, Journal Year: 2024, Volume and Issue: 244(6), P. 2113 - 2114

Published: Nov. 20, 2024

Language: Английский

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