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231226s2022 xx |||||o 00| ||eng c |
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|a 10.1111/nph.18157
|2 doi
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|a pubmed24n1131.xml
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|a (DE-627)NLM339333383
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|a (NLM)35403713
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Brunn, Melanie
|e verfasserin
|4 aut
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| 245 |
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|a Carbon allocation to root exudates is maintained in mature temperate tree species under drought
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|c 2022
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 01.07.2022
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|a Date Revised 21.07.2022
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.
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|a Carbon (C) exuded via roots is proposed to increase under drought and facilitate important ecosystem functions. However, it is unknown how exudate quantities relate to the total C budget of a drought-stressed tree, that is, how much of net-C assimilation is allocated to exudation at the tree level. We calculated the proportion of daily C assimilation allocated to root exudation during early summer by collecting root exudates from mature Fagus sylvatica and Picea abies exposed to experimental drought, and combining above- and belowground C fluxes with leaf, stem and fine-root surface area. Exudation from individual roots increased exponentially with decreasing soil moisture, with the highest increase at the wilting point. Despite c. 50% reduced C assimilation under drought, exudation from fine-root systems was maintained and trees exuded 1.0% (F. sylvatica) to 2.5% (P. abies) of net C into the rhizosphere, increasing the proportion of C allocation to exudates two- to three-fold. Water-limited P. abies released two-thirds of its exudate C into the surface soil, whereas in droughted F. sylvatica it was only one-third. Across the entire root system, droughted trees maintained exudation similar to controls, suggesting drought-imposed belowground C investment, which could be beneficial for ecosystem resilience
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Fagus sylvatica (European beech)
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| 650 |
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|a Picea abies (Norway spruce)
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| 650 |
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4 |
|a belowground carbon allocation
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| 650 |
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4 |
|a carbon partitioning
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| 650 |
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4 |
|a experimental drought
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| 650 |
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4 |
|a fine-root exudation
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| 650 |
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|a rhizosphere
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| 650 |
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|a temperate forest C budget
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| 650 |
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|a Soil
|2 NLM
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| 650 |
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|a Carbon
|2 NLM
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| 650 |
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|a 7440-44-0
|2 NLM
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| 700 |
1 |
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|a Hafner, Benjamin D
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zwetsloot, Marie J
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Weikl, Fabian
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Pritsch, Karin
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Hikino, Kyohsuke
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Ruehr, Nadine K
|e verfasserin
|4 aut
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| 700 |
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|a Sayer, Emma J
|e verfasserin
|4 aut
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| 700 |
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|a Bauerle, Taryn L
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 235(2022), 3 vom: 15. Aug., Seite 965-977
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnns
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| 773 |
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|g volume:235
|g year:2022
|g number:3
|g day:15
|g month:08
|g pages:965-977
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|u http://dx.doi.org/10.1111/nph.18157
|3 Volltext
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