Variable effects of nutrient enrichment on soil respiration in mangrove forests

Lovelock, Catherine E., Feller, Ilka C., Reef, Ruth and Ruess, Roger W. (2014) Variable effects of nutrient enrichment on soil respiration in mangrove forests. Plant and Soil, 379 1-2: 135-148. doi:10.1007/s11104-014-2036-6


Author Lovelock, Catherine E.
Feller, Ilka C.
Reef, Ruth
Ruess, Roger W.
Title Variable effects of nutrient enrichment on soil respiration in mangrove forests
Journal name Plant and Soil   Check publisher's open access policy
ISSN 0032-079X
1573-5036
Publication date 2014-06
Sub-type Article (original research)
DOI 10.1007/s11104-014-2036-6
Open Access Status
Volume 379
Issue 1-2
Start page 135
End page 148
Total pages 14
Place of publication Dordrecht, Netherlands
Publisher Springer
Collection year 2015
Language eng
Formatted abstract
Background and Aims: Mangrove forests are globally important sites of carbon burial that are increasingly exposed to nutrient pollution. Here we assessed the response of soil respiration, an important component of forest carbon budgets, to nutrient enrichment over a wide range of mangrove forests.

Methods: We assessed the response of soil respiration to nutrient enrichment using fertilization experiments within 22 mangrove forests over ten sites. We used boosted regression tree (BRT) models to determine the importance of environmental and plant factors for soil respiration and its responsiveness to fertilizer treatments.

Results: Leaf area index explained the largest proportion of variation in soil respiration rates (LAI, 45.9 %) followed by those of site, which had a relative influence of 39.9 % in the BRT model. Nutrient enrichment enhanced soil respiration only in nine out of 22 forests. Soil respiration in scrub forests showed a positive response to nutrient addition more frequently than taller fringing forests. The response of soil respiration to nutrient enrichment varied with changes in specific leaf area (SLA) and stem extension, with relative influences of 14.4 %, 13.6 % in the BRT model respectively.

Conclusions: Soil respiration in mangroves varied with LAI, but other site specific factors also influenced soil respiration and its response to nutrient enrichment. Strong enhancements in aboveground growth but moderate increases in soil respiration with nutrient enrichment indicated that nutrient enrichment of mangrove forests has likely increased net ecosystem production.  
Keyword Soil CO2 efflux
Nitrogen
Phosphorus
Avicennia
Rhizophora
Growth
Salinity
Carbon cycling
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Biological Sciences Publications
 
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Created: Thu, 15 May 2014, 17:45:14 EST by Professor Catherine Lovelock on behalf of School of Biological Sciences