Interaction of fertilization and soil water status determine C partitioning in a sedge wetland

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F19%3A43899377" target="_blank" >RIV/60076658:12310/19:43899377 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/19:10403164

Result on the web

<a href="https://reader.elsevier.com/reader/sd/pii/S0038071719301063?token=D3FF40B243A20BD64207760DA24143224A930DFC4523915D43ECA2090D8105B08B39EC5E2F60279EADCD69B047CFB132" target="_blank" >https://reader.elsevier.com/reader/sd/pii/S0038071719301063?token=D3FF40B243A20BD64207760DA24143224A930DFC4523915D43ECA2090D8105B08B39EC5E2F60279EADCD69B047CFB132</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.soilbio.2019.03.031" target="_blank" >10.1016/j.soilbio.2019.03.031</a>

Result language

angličtina

Original language name

Interaction of fertilization and soil water status determine C partitioning in a sedge wetland

Original language description

Photosynthetic carbon (C) fixation and its partitioning in the plant-soil system are responsible for soil C sequestration and nutrient cycling. These microbially-mediated biogeochemical processess are impacted strongly by soil nutrient availability and soil moisture, which are being altered by global environmental change. We studied the interactive effects of fertilization (fertilized vs unfertilized) and water regime (high-water vs low-water level) on plant C fixation and rhizodeposition, and the subsequent microbial processing of plant-derived C substrates in mesocosms planted with the wetland sedge Carex acuta. We used a (CO2)-C-13 pulse-labelling approach to track assimilates in plants, microbial phospholipid fatty acids (PLFA) and soils for 7 days. Fertilizer X water regime interactions affected the dynamics of root C-13 efflux, microbial utilization and final C-13 sequestration in the soil. Plants growing in high-water unfertilized soils rapidly exuded a greater proportion of C-13 into the rhizosphere, but the temporal increase in soil 13C was lower than in the other treatments. In contrast, the greatest temporal increase in soil C-13 was observed in high-water fertilized systems. This occurred because fertilized plants were more productive and fixed more C, which resulted in larger root biomass with faster turnover and consequently larger amounts of C-13 immobilized in the high-water fertilized soils than high-water unfertilized soils. The composition of microbial communities processing the C rhizodeposits was dynamic during the 7 d study. Initially, the exuded C-13 was processed mainly by bacteria, while fungal PLFA became progressively more enriched after 7 d. This indicates that fungi were the main recipients of C in rhizodeposits at this time, regardless of nutrient availability or soil water regime. In summary, fertilization of the C. acuta sedge wetland stimulated above- and belowground production and selected for a smaller but more active microbial community dominated by fungi. Fertilization enhanced soil C sequestration of recently fixed photosynthates in this wet sedge grassland.

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

40104 - Soil science

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

Soil Biology &amp; Biochemistry

ISSN

0038-0717

e-ISSN

—

Volume of the periodical

135

Issue of the periodical within the volume

AUG 2019

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

85-94

UT code for WoS article

000477689700011

EID of the result in the Scopus database

2-s2.0-85065500229