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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10611 - Plant sciences, botany

Project

<a href="/en/project/GA16-21743S" target="_blank" >GA16-21743S: C:N stoichiometry in plant-soil interactions: effects on plant metabolism and processes in the rhizosphere</a><br>

Continuities

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

Publication year

2017

Confidentiality

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

Name of the periodical

Plant and Soil

ISSN

0032-079X

e-ISSN

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Volume of the periodical

412

Issue of the periodical within the volume

1-2

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

14

Pages from-to

331-344

UT code for WoS article

000399020200024

EID of the result in the Scopus database

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