When do plant hydraulics matter in terrestrial biosphere modelling?

Global Change Biology, Journal Year: 2023, Volume and Issue: 30(1)

Published: Nov. 14, 2023

Abstract The ascent of water from the soil to leaves vascular plants, described by study plant hydraulics, regulates ecosystem responses environmental forcing and recovery stress periods. Several approaches model hydraulics have been proposed. In this study, we introduce four different versions representations in terrestrial biosphere T&C understand significance functioning. We tested investigating capacitance, long‐term xylem damages following drought. models were a combination including or neglecting capacitance damage legacies. Using at six case studies spanning semiarid tropical ecosystems, quantify how flow, storage can modulate overall carbon dynamics across multiple time scales. show that as drought develops, with predict slower onset stress, diurnal variability fluxes closer observations. Plant was found be particularly important for fluxes, include yielding better results. Models permanent conducting tissues an additional significant legacy effect, limiting productivity during phase major droughts. However, when considering observed climate variability, hydraulic modules alone cannot significantly improve performance, even though they reproduce more realistic dynamics. This opens new avenues development, explicitly linking processes, such phenology improved allocation algorithms.

Language: Английский

Detecting Vegetation Stress in Mixed Forest Ecosystems Through the Joint Use of Tree‐Water Monitoring and Land Surface Modeling

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(8)

Published: Aug. 1, 2024

Abstract Recent European heatwaves have significantly impacted forest ecosystems, leading to increased plant water stress. Advances in land surface models aim improve the representation of vegetation drought responses by incorporating hydraulics into functional type (PFT) classification system. However, reliance on PFTs may inadequately capture diverse hydraulic traits (PHTs), potentially biasing transpiration and stress representations. The detection is further complicated mixing different tree species patches. This study uses Community Land Model version 5.0 simulate an experimental mixed‐forest catchment with configurations representing standalone, patched mixed, fully‐mixed forests. Biome‐generic, PFT‐specific, or species‐specific PHTs are employed. Results emphasize crucial role accurately mixed forests reproducing observed fluxes for both broadleaf needleleaf species. dominant fraction a key determinant, influencing aggregated response patterns. Segregation level PHT parameterizations shapes differences between simulated fluxes. Simulated root potential emerges as metric detecting periods. model's system has limitations long‐term effects extreme weather events These findings highlight complexity modeling underscore need improved diversity enhance understanding under changing climate conditions.

Language: Английский