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The effects of drought on the interaction between carbon and nitrogen relations in trees

English title The effects of drought on the interaction between carbon and nitrogen relations in trees
Applicant Gessler Arthur
Number 159866
Funding scheme Project funding (Div. I-III)
Research institution Swiss Federal Research Inst. WSL Direktion
Institution of higher education Swiss Federal Institute for Forest, Snow and Landscape Research - WSL
Main discipline Agricultural and Forestry Sciences
Start/End 01.03.2016 - 28.02.2019
Approved amount 387'733.00
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All Disciplines (3)

Discipline
Agricultural and Forestry Sciences
Botany
Ecology

Keywords (5)

nutrient uptake; stable isotopes; assimilate transport; carbon starvation; drought

Lay Summary (German)

Lead
Der Klimawandel wird Wachstum und Vitalität von Waldbäumen in Zukunft beeinflussen. Die Mechanismen, die zu einer Schädigung der Bäume bei erhöhter Dürrehäufigkeit führen, sind aber nur unvollständig geklärt. Dieses Projekt wird die Rolle der Nährstoffversorgung unter Trockenheit untersuchen und somit einen wichtigen Beitrag zur Aufklärung der grundlegenden Mechanismen leisten.
Lay summary

Titel des Forschungsprojekts

 

Die Auswirkungen von Trockenheit auf das Zusammenspiel zwischen Kohlenstoff- und Wasserhaushalt bei Bäumen.

 The effects of drought on the interaction between carbon and nitrogen relations in trees

 

 

Inhalte und Ziele des Forschungsprojekts 

Trockenheit kann zu einer Reduktion der Nährstoffaufnahme über die Wurzeln und zu Störungen der Verteilung der Nährstoffe im Baum führen. Die Bedeutung eines so induzierten Nährstoffmangels für die Widerstandsfähigkeit von Bäumen gegenüber Dürre ist allerdings kaum bekannt.

Die Forschung, die in diesem Projekt durchgeführt wird, hat zum Ziel die Auswirkungen von Dürre auf die Nährstoffaufnahmekapazität der Wurzeln unterschiedlicher Baumarten zu untersuchen. Weiterhin werden wir analysieren, welche Mechanismen einer reduzierten Aufnahmekapazität zugrunde liegen und ob es Kompensationsstrategien, wie zum Beispiel die vermehrte Bildung von Wurzelbiomasse, gibt.
Durch die Verknüpfung von Untersuchungen der Nährstoffaufnahme mit dem Kohlenstoff- und Wasserhaushalt wird diese Arbeit bestehende konzeptionellen Modelle zur Auswirkung von Trockenheit auf die Funktion von Bäumen und Wäldern ergänzen und erweitern.

Wissenschaftlicher und gesellschaftlicher Kontext des Forschungsprojekts  

Das Projekt befasst sich mit Grundlagenforschung, die dazu dient Prozesse besser zu verstehen, die in einem sich verändernden Klima, die Funktionen und Leistungen unserer Wälder beeinflussen werden. Aufgrund unsere Untersuchungen können wir die Auswirkungen von Dürre auf die heimischen Wälder besser verstehen und mit entsprechenden waldbaulichen Maßnahmen Schäden entgegenwirken. 

 

 

Direct link to Lay Summary Last update: 07.04.2015

Responsible applicant and co-applicants

Employees

Publications

Publication
Application of a laser-based spectrometer for continuous in situ measurements of stable isotopes of soil CO<sub>2</sub> in calcareous and acidic soils
Joseph Jobin, Külls Christoph, Arend Matthias, Schaub Marcus, Hagedorn Frank, Gessler Arthur, Weiler Markus (2019), Application of a laser-based spectrometer for continuous in situ measurements of stable isotopes of soil CO<sub>2</sub> in calcareous and acidic soils, in SOIL, 5(1), 49-62.
Reductions in tree performance during hotter droughts are mitigated by shifts in nitrogen cycling
Grossiord Charlotte, Gessler Arthur, Reed Sasha C., Borrego Isaac, Collins Adam D., Dickman Lee T., Ryan Max, Schönbeck Leonie, Sevanto Sanna, Vilagrosa Alberto, McDowell Nate G. (2018), Reductions in tree performance during hotter droughts are mitigated by shifts in nitrogen cycling, in Plant, Cell & Environment, 41(11), 2627-2637.
Nitrogen nutrition of beech forests in a changing climate: importance of plant-soil-microbe water, carbon, and nitrogen interactions
Simon Judy, Dannenmann Michael, Pena Rodica, Gessler Arthur, Rennenberg Heinz (2017), Nitrogen nutrition of beech forests in a changing climate: importance of plant-soil-microbe water, carbon, and nitrogen interactions, in Plant and Soil, 418(1-2), 89-114.
The role of nutrients in drought-induced tree mortality and recovery
Gessler Arthur, Schaub Marcus, McDowell Nate G. (2017), The role of nutrients in drought-induced tree mortality and recovery, in New Phytologist, 214(2), 513-520.

Collaboration

Group / person Country
Types of collaboration
Botanik, University of Basel Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Climate Research Lab; Los Alamos National Laboratory United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Institute for Landscape Biogeochemistry, Leibniz Centre for Agricultural Landscape Research Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
ZBSA, Albert-Ludwigs-University of Freiburg Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Chair of Hydrology, Albert-Ludwigs-University of Freiburg Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
GFOe Annual Meeting Talk given at a conference Carbon and water – effects of 15 years of precipitation manipulation on C allocation and storage in Scots Pine 10.09.2018 Vienna, Austria Gessler Arthur; Jobin Joseph;
ESA annual meeting Talk given at a conference Carbon and nitrogen dynamics in a 100-year-old drought stressed Scots pine forest 05.08.2018 New Orleans, United States of America Gessler Arthur; Jobin Joseph;
EGU General Assembly Individual talk Water and carbon dynamics in plants-what happens after a drought? 09.04.2018 Vienna, Austria Gessler Arthur; Jobin Joseph;
125th IUFRO Anniversary Congress Talk given at a conference Carbon allocation, drought and source-sink relationships in trees 18.09.2017 Freiburg, Germany Jobin Joseph; Gessler Arthur;
EGU General Assembly Talk given at a conference Carbon and Nitrogen dynamics in deciduous and broad leaf trees under drought stress 24.04.2017 Vienna, Austria Gessler Arthur; Jobin Joseph;
EGU General Assembly Talk given at a conference Mechanisms and Control of Phloem Transport in Trees: Fast and Slow-Sink and Source 24.04.2017 Vienna, Austria Jobin Joseph; Gessler Arthur;


Abstract

The Global Climate Change is projected to increase the frequency and intensity of weather extremes in Central Europe. As one consequence extreme drought events will occur more often with potential negative effects on the growth and performance of trees and forest ecosystems. Mainly two complementing mechanisms leading to growth impairment, reduction of physiological performance and mortality upon drought are discussed at present, namely hydraulic failure (as a result of xylem embolisms) and carbon starvation (due to insufficient photosynthetic carbon assimilation). In addition, the negative impacts of drought on nutrient uptake may lead to disturbed nutrient balance of trees and ecosystems. Hence, nutrient uptake is an additional important parameter affecting tree performance under drought and there is only little information available on the underlying mechanisms.The research proposed here will thus shed light on the effects of drought and recovery from drought on the nitrogen uptake of trees. Nitrogen is the major growth limiting nutrient in natural temperate terrestrial ecosystems and has thus been chosen as model nutrient. The proposed project consists of three modules: in module 1 we will screen the importance of physiological restrictions of nitrogen uptake capacity (Jmax (maximum ammonium and nitrate net uptake capacity) and C50 (nitrate or ammonium concentration where 50% of the maximum net uptake is observed)) under drought for seven different tree species. Module 1 will also assess the plasticity of tree species to compensate for a decreased soil nitrogen availability with biomass allocation to the mycorrhizal fine roots. Module 2 will build upon this screening and consist of an in-depth analysis of the mechanisms that control the nitrogen uptake capacity under restricted water supply, with a particular focus on the interplay between transport of recent assimilates belowground and nitrogen uptake. In module 3, we will extend the mechanistic analysis of module 2 to the phase of recovery from drought and will focus on the re-establishment of transport of recent assimilates and nitrogen uptake capacity. By linking nutrient uptake with the carbon and water balance this work will complement and extend the existing conceptual models on drought effects on tree physiology
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