Rhizodeposition flux of competitive versus conservative graminoid: contribution of exudates and root lysates as affected by N loading

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F17%3A43895579" target="_blank" >RIV/60076658:12310/17:43895579 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/content/pdf/10.1007%2Fs11104-016-3066-z.pdf" target="_blank" >https://link.springer.com/content/pdf/10.1007%2Fs11104-016-3066-z.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11104-016-3066-z" target="_blank" >10.1007/s11104-016-3066-z</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Rhizodeposition flux of competitive versus conservative graminoid: contribution of exudates and root lysates as affected by N loading

Popis výsledku v původním jazyce

Background and aims Carbon distribution between root production and rhizodeposition represents the plant strategy for growth and nutrient capture. It can shift in response to changed availability of limiting nutrients, with important consequences for ecosystem functioning. We studied the influence of nitrogen (N) availability on the belowground C fluxes of two wetland graminoids, the competitive Glyceria maxima and the conservative Carex acuta. Methods Plants grown in pots under two levels of N availability were pulse-labeled with (CO2)-C-13 and the C-13 distribution in the plant-soil systems was followed for 15 days. Together with C-13 allocation measurements, root production and death were estimated to constrain the belowground C fluxes, including rhizodeposition. Results Higher N supply enhanced root biomass and, subsequently, the total rhizodeposition. Both species shifted partitioning of belowground C towards higher mass-specific root production and turnover, with lower investments into root exudation. Therefore, the rhizodeposition was enriched in root-derived lysates over soluble exudates. Increased total rhizodeposition and its changed quality enhanced the concentration of soluble organic C. The N fertilization induced changes in belowground C fluxes were species-specific. Contrary to Glyceria, Carex enhanced mass-specific root growth rate, which implied a markedly larger rootderived C flux to soil. Conclusions In general, soil N loading enhanced total C rhizodeposition and, simultaneously, the proportion of predominantly more complex root lysates over soluble root exudates, with consequences for soil organic matter dynamics. Our results also underline the importance of species-specific responses to N loading in predicting total rhizodeposition flux and changes in its quality.

Název v anglickém jazyce

Rhizodeposition flux of competitive versus conservative graminoid: contribution of exudates and root lysates as affected by N loading

Popis výsledku anglicky

Background and aims Carbon distribution between root production and rhizodeposition represents the plant strategy for growth and nutrient capture. It can shift in response to changed availability of limiting nutrients, with important consequences for ecosystem functioning. We studied the influence of nitrogen (N) availability on the belowground C fluxes of two wetland graminoids, the competitive Glyceria maxima and the conservative Carex acuta. Methods Plants grown in pots under two levels of N availability were pulse-labeled with (CO2)-C-13 and the C-13 distribution in the plant-soil systems was followed for 15 days. Together with C-13 allocation measurements, root production and death were estimated to constrain the belowground C fluxes, including rhizodeposition. Results Higher N supply enhanced root biomass and, subsequently, the total rhizodeposition. Both species shifted partitioning of belowground C towards higher mass-specific root production and turnover, with lower investments into root exudation. Therefore, the rhizodeposition was enriched in root-derived lysates over soluble exudates. Increased total rhizodeposition and its changed quality enhanced the concentration of soluble organic C. The N fertilization induced changes in belowground C fluxes were species-specific. Contrary to Glyceria, Carex enhanced mass-specific root growth rate, which implied a markedly larger rootderived C flux to soil. Conclusions In general, soil N loading enhanced total C rhizodeposition and, simultaneously, the proportion of predominantly more complex root lysates over soluble root exudates, with consequences for soil organic matter dynamics. Our results also underline the importance of species-specific responses to N loading in predicting total rhizodeposition flux and changes in its quality.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10611 - Plant sciences, botany

Projekt

<a href="/cs/project/GA16-21743S" target="_blank" >GA16-21743S: C:N stechiometrie ve vztazích mezi rostlinou a půdou: vliv na metabolismus rostliny a procesy v rhizosféře</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Plant and Soil

ISSN

0032-079X

e-ISSN

—

Svazek periodika

412

Číslo periodika v rámci svazku

1-2

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

331-344

Kód UT WoS článku

000399020200024

EID výsledku v databázi Scopus

—