Short- and long-term effects of nutrient enrichment on microbial exoenzyme activity in mangrove peat

Handle URI:
http://hdl.handle.net/10754/599361
Title:
Short- and long-term effects of nutrient enrichment on microbial exoenzyme activity in mangrove peat
Authors:
Keuskamp, Joost A.; Feller, Ilka C.; Laanbroek, Hendrikus J.; Verhoeven, Jos T.A.; Hefting, Mariet M.
Abstract:
© 2014 Elsevier Ltd. Mangroves receive increasing quantities of nutrients as a result of coastal development, which could lead to significant changes in carbon sequestration and soil subsidence. We hypothesised that mangrove-produced tannins induce a nitrogen (N) limitation on microbial decomposition even when plant growth is limited by phosphorus (P). As a result, increased N influx would lead to a net loss of sequestered carbon negating the ability to compensate for sea level rise in P-limited mangroves. To examine this, we quantified the short- and long-term effects of N and P enrichment on microbial biomass and decomposition-related enzyme activities in a Rhizophora mangle-dominated mangrove, which had been subjected to fertilisation treatments for a period of fifteen years. We compared microbial biomass, elemental stoichiometry and potential enzyme activity in dwarf and fringe-type R. mangle-dominated sites, where primary production is limited by P or N depending on the proximity to open water. Even in P-limited mangroves, microbial activity was N-limited as indicated by stoichiometry and an increase in enzymic activity upon N amendment. Nevertheless, microbial biomass increased upon field additions of P, indicating that the carbon supply played even a larger role. Furthermore, we found that P amendment suppressed phenol oxidase activity, while N amendment did not. The possible differential nutrient limitations of microbial decomposers versus primary producers implies that the direction of the effect of eutrophication on carbon sequestration is nutrient-specific. In addition, this study shows that phenol oxidase activities in this system decrease through P, possibly strengthening the enzymic latch effect of mangrove tannins. Furthermore, it is argued that the often used division between N-harvesting, P-harvesting, and carbon-harvesting exoenzymes needs to be reconsidered.
Citation:
Keuskamp JA, Feller IC, Laanbroek HJ, Verhoeven JTA, Hefting MM (2015) Short- and long-term effects of nutrient enrichment on microbial exoenzyme activity in mangrove peat. Soil Biology and Biochemistry 81: 38–47. Available: http://dx.doi.org/10.1016/j.soilbio.2014.11.003.
Publisher:
Elsevier BV
Journal:
Soil Biology and Biochemistry
KAUST Grant Number:
KUK-C1-017-12
Issue Date:
Feb-2015
DOI:
10.1016/j.soilbio.2014.11.003
Type:
Article
ISSN:
0038-0717
Sponsors:
This study was supported by Schure-Beijerinck-Popping Fonds (SBP/JK/2010-30), the Smithsonian Marine Science Network and by the King Abdullah University of Science and Technology KAUST (KUK-C1-017-12).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorKeuskamp, Joost A.en
dc.contributor.authorFeller, Ilka C.en
dc.contributor.authorLaanbroek, Hendrikus J.en
dc.contributor.authorVerhoeven, Jos T.A.en
dc.contributor.authorHefting, Mariet M.en
dc.date.accessioned2016-02-28T06:05:33Zen
dc.date.available2016-02-28T06:05:33Zen
dc.date.issued2015-02en
dc.identifier.citationKeuskamp JA, Feller IC, Laanbroek HJ, Verhoeven JTA, Hefting MM (2015) Short- and long-term effects of nutrient enrichment on microbial exoenzyme activity in mangrove peat. Soil Biology and Biochemistry 81: 38–47. Available: http://dx.doi.org/10.1016/j.soilbio.2014.11.003.en
dc.identifier.issn0038-0717en
dc.identifier.doi10.1016/j.soilbio.2014.11.003en
dc.identifier.urihttp://hdl.handle.net/10754/599361en
dc.description.abstract© 2014 Elsevier Ltd. Mangroves receive increasing quantities of nutrients as a result of coastal development, which could lead to significant changes in carbon sequestration and soil subsidence. We hypothesised that mangrove-produced tannins induce a nitrogen (N) limitation on microbial decomposition even when plant growth is limited by phosphorus (P). As a result, increased N influx would lead to a net loss of sequestered carbon negating the ability to compensate for sea level rise in P-limited mangroves. To examine this, we quantified the short- and long-term effects of N and P enrichment on microbial biomass and decomposition-related enzyme activities in a Rhizophora mangle-dominated mangrove, which had been subjected to fertilisation treatments for a period of fifteen years. We compared microbial biomass, elemental stoichiometry and potential enzyme activity in dwarf and fringe-type R. mangle-dominated sites, where primary production is limited by P or N depending on the proximity to open water. Even in P-limited mangroves, microbial activity was N-limited as indicated by stoichiometry and an increase in enzymic activity upon N amendment. Nevertheless, microbial biomass increased upon field additions of P, indicating that the carbon supply played even a larger role. Furthermore, we found that P amendment suppressed phenol oxidase activity, while N amendment did not. The possible differential nutrient limitations of microbial decomposers versus primary producers implies that the direction of the effect of eutrophication on carbon sequestration is nutrient-specific. In addition, this study shows that phenol oxidase activities in this system decrease through P, possibly strengthening the enzymic latch effect of mangrove tannins. Furthermore, it is argued that the often used division between N-harvesting, P-harvesting, and carbon-harvesting exoenzymes needs to be reconsidered.en
dc.description.sponsorshipThis study was supported by Schure-Beijerinck-Popping Fonds (SBP/JK/2010-30), the Smithsonian Marine Science Network and by the King Abdullah University of Science and Technology KAUST (KUK-C1-017-12).en
dc.publisherElsevier BVen
dc.subjectDecompositionen
dc.subjectDifferential nutrient limitationen
dc.subjectMangrovesen
dc.subjectMicrobial activityen
dc.subjectMicrobial elemental stoichiometryen
dc.subjectPeaten
dc.subjectRhizophoraen
dc.subjectSOCen
dc.titleShort- and long-term effects of nutrient enrichment on microbial exoenzyme activity in mangrove peaten
dc.typeArticleen
dc.identifier.journalSoil Biology and Biochemistryen
dc.contributor.institutionUtrecht University, Utrecht, Netherlandsen
dc.contributor.institutionSmithsonian Environmental Research Center, Edgewater, United Statesen
dc.contributor.institutionNetherlands Institute of Ecology, Wageningen, Netherlandsen
kaust.grant.numberKUK-C1-017-12en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.