Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.16050 |
Uncovering the critical soil moisture thresholds of plant water stress for European ecosystems | |
Zheng Fu; Philippe Ciais; David Makowski; Ana Bastos; Paul C. Stoy; Andreas Ibrom; Alexander Knohl; Mirco Migliavacca; Matthias Cuntz; Ladislav Š; igut; Matthias Peichl; Denis Loustau; Tarek S. El-Madany; Nina Buchmann; Mana Gharun; Ivan Janssens; Christian Markwitz; Thomas Grü; nwald; Corinna Rebmann; Meelis Mö; lder; Andrej Varlagin; Ivan Mammarella; Pasi Kolari; Christian Bernhofer; Michal Heliasz; Caroline Vincke; Andrea Pitacco; Edoardo Cremonese; Lenka Foltý; nová; Jean-Pierre Wigneron | |
2021-12-30 | |
发表期刊 | Global Change Biology |
出版年 | 2021 |
英文摘要 | Understanding the critical soil moisture (SM) threshold (θcrit) of plant water stress and land surface energy partitioning is a basis to evaluate drought impacts and improve models for predicting future ecosystem condition and climate. Quantifying the θcrit across biomes and climates is challenging because observations of surface energy fluxes and SM remain sparse. Here, we used the latest database of eddy covariance measurements to estimate θcrit across Europe by evaluating evaporative fraction (EF)-SM relationships and investigating the covariance between vapor pressure deficit (VPD) and gross primary production (GPP) during SM dry-down periods. We found that the θcrit and soil matric potential threshold in Europe are 16.5% and −0.7 MPa, respectively. Surface energy partitioning characteristics varied among different vegetation types; EF in savannas had the highest sensitivities to SM in water-limited stage, and the lowest in forests. The sign of the covariance between daily VPD and GPP consistently changed from positive to negative during dry-down across all sites when EF shifted from relatively high to low values. This sign of the covariance changed after longer period of SM decline in forests than in grasslands and savannas. Estimated θcrit from the VPD–GPP covariance method match well with the EF–SM method, showing this covariance method can be used to detect the θcrit. We further found that soil texture dominates the spatial variability of θcrit while shortwave radiation and VPD are the major drivers in determining the spatial pattern of EF sensitivities. Our results highlight for the first time that the sign change of the covariance between daily VPD and GPP can be used as an indicator of how ecosystems transition from energy to SM limitation. We also characterized the corresponding θcrit and its drivers across diverse ecosystems in Europe, an essential variable to improve the representation of water stress in land surface models. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/345156 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Zheng Fu,Philippe Ciais,David Makowski,et al. Uncovering the critical soil moisture thresholds of plant water stress for European ecosystems[J]. Global Change Biology,2021. |
APA | Zheng Fu.,Philippe Ciais.,David Makowski.,Ana Bastos.,Paul C. Stoy.,...&Jean-Pierre Wigneron.(2021).Uncovering the critical soil moisture thresholds of plant water stress for European ecosystems.Global Change Biology. |
MLA | Zheng Fu,et al."Uncovering the critical soil moisture thresholds of plant water stress for European ecosystems".Global Change Biology (2021). |
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