Drought resistance and resilience of rhizosphere communities in forest soils from the cellular to ecosystem scale - insights from 13 C pulse labeling.

Autor: Gao D; Swiss Federal Institute for Forest, Snow and Landscape Research, 8903, Birmensdorf, Switzerland.; Qianyanzhou Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 100101, Beijing, China.; College of Resources and Environment, University of Chinese Academy of Sciences, 100190, Beijing, China., Luster J; Swiss Federal Institute for Forest, Snow and Landscape Research, 8903, Birmensdorf, Switzerland., Zürcher A; Swiss Federal Institute for Forest, Snow and Landscape Research, 8903, Birmensdorf, Switzerland., Arend M; Swiss Federal Institute for Forest, Snow and Landscape Research, 8903, Birmensdorf, Switzerland.; Physiological Plant Ecology, University of Basel, 4056, Basel, Switzerland., Bai E; Key Laboratory of Geographical Processes and Ecological Security of Changbai Mountains, Ministry of Education, Northeast Normal University, 130024, Changchun, China., Gessler A; Swiss Federal Institute for Forest, Snow and Landscape Research, 8903, Birmensdorf, Switzerland.; Terrestrial Ecosystems, ETH Zürich, 8092, Zürich, Switzerland., Rigling A; Swiss Federal Institute for Forest, Snow and Landscape Research, 8903, Birmensdorf, Switzerland.; Terrestrial Ecosystems, ETH Zürich, 8092, Zürich, Switzerland., Schaub M; Swiss Federal Institute for Forest, Snow and Landscape Research, 8903, Birmensdorf, Switzerland., Hartmann M; Sustainable Agroecosystems Group, Department of Environmental Systems Science, Institute of Agricultural Sciences, ETH Zürich, 8092, Zürich, Switzerland., Werner RA; Agricultural Sciences, ETH Zürich, 8092, Zürich, Switzerland., Joseph J; Swiss Federal Institute for Forest, Snow and Landscape Research, 8903, Birmensdorf, Switzerland., Poll C; Soil Biology, University of Hohenheim, 70599, Stuttgart, Germany., Hagedorn F; Swiss Federal Institute for Forest, Snow and Landscape Research, 8903, Birmensdorf, Switzerland.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2024 May; Vol. 242 (3), pp. 960-974. Date of Electronic Publication: 2024 Feb 25.
DOI: 10.1111/nph.19612
Abstrakt: The link between above- and belowground communities is a key uncertainty in drought and rewetting effects on forest carbon (C) cycle. In young beech model ecosystems and mature naturally dry pine forest exposed to 15-yr-long irrigation, we performed 13 C pulse labeling experiments, one during drought and one 2 wk after rewetting, tracing tree assimilates into rhizosphere communities. The 13 C pulses applied in tree crowns reached soil microbial communities of the young and mature forests one and 4 d later, respectively. Drought decreased the transfer of labeled assimilates relative to the irrigation treatment. The 13 C label in phospholipid fatty acids (PLFAs) indicated greater drought reduction of assimilate incorporation by fungi (-85%) than by gram-positive (-43%) and gram-negative bacteria (-58%). 13 C label incorporation was more strongly reduced for PLFAs (cell membrane) than for microbial cytoplasm extracted by chloroform. This suggests that fresh rhizodeposits are predominantly used for osmoregulation or storage under drought, at the expense of new cell formation. Two weeks after rewetting, 13 C enrichment in PLFAs was greater in previously dry than in continuously moist soils. Drought and rewetting effects were greater in beech systems than in pine forest. Belowground C allocation and rhizosphere communities are highly resilient to drought.
(© 2024 The Authors. New Phytologist © 2024 New Phytologist Foundation.)
Databáze: MEDLINE
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