Articles | Volume 23, issue 18
https://doi.org/10.5194/bg-23-6763-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-6763-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Tree-microbe-soil interactions affecting soil organic carbon fractions in Mediterranean forest soils
Plant & Environmental Sciences Department, Weizmann Institute of Science, Rehovot 7610001, Israel
Assaf Yaakobi
Plant & Environmental Sciences Department, Weizmann Institute of Science, Rehovot 7610001, Israel
David Yalin
The Israel Agricultural Research Organization (Volcani Institute), Rishon LeZion 7505101, Israel
Dagan Sade
Ecosystem Microbiome Research Unit, Life Science Core Facilities, Weizmann Institute of Science, Rehovot 7610001, Israel
Efrat Dener
Albert Katz International School for Desert Studies, Jacob Blaustein Institutes for Desert Research, Ben Gurion University of the Negev, Sede Boqer Campus, Midreshet Ben-Gurion 8499000, Israel
Mitrani Department of Desert Ecology, Swiss Institute for Dryland Environmental and Energy Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Midreshet Ben-Gurion 8499000, Israel
Yaara Oppenheimer-Shaanan
Plant & Environmental Sciences Department, Weizmann Institute of Science, Rehovot 7610001, Israel
Department of Life Sciences, Achva Academic College, Arugot 79804, Israel
Tamir Klein
Plant & Environmental Sciences Department, Weizmann Institute of Science, Rehovot 7610001, Israel
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Ben-El Levy, Yedidya Ben-Eliyahu, Yaniv-Brian Grunstein, Itay Halevy, and Tamir Klein
Biogeosciences, 22, 5069–5079, https://doi.org/10.5194/bg-22-5069-2025, https://doi.org/10.5194/bg-22-5069-2025, 2025
Short summary
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As atmospheric CO2 increases globally, plants increase the rate of photosynthesis. Still, leaf–gas exchange can be downregulated by the plant. Here we tested the limits of these plant responses in a fruit tree species under very high CO2 levels relevant to the future Earth and to contemporary Mars. Plant water use decreased at 1600 ppm CO2 and remained low at 6000 ppm. Photosynthesis significantly increased at 6000 ppm. In summary, ultra-high CO2 may partly compensate for limited water availability.
Daniel Nadal-Sala, Rüdiger Grote, David Kraus, Uri Hochberg, Tamir Klein, Yael Wagner, Fedor Tatarinov, Dan Yakir, and Nadine K. Ruehr
Biogeosciences, 21, 2973–2994, https://doi.org/10.5194/bg-21-2973-2024, https://doi.org/10.5194/bg-21-2973-2024, 2024
Short summary
Short summary
A hydraulic model approach is presented that can be added to any physiologically based ecosystem model. Simulated plant water potential triggers stomatal closure, photosynthesis decline, root–soil resistance increases, and sapwood and foliage senescence. The model has been evaluated at an extremely dry site stocked with Aleppo pine and was able to represent gas exchange, soil water content, and plant water potential. The model also responded realistically regarding leaf senescence.
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Short summary
We studied how tree species and local soil conditions shape carbon storage in Mediterranean forest soils. By comparing mixed and single-species stands and sampling beneath trees and in nearby open gaps, we found that soils under canopies held much more carbon. Mixed stands stored extra carbon mainly in faster-cycling forms, while longer-lasting carbon was limited mostly by soil texture. This shows that forest structure can influence carbon storage in a warming, drier climate.
We studied how tree species and local soil conditions shape carbon storage in Mediterranean...
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