Plant and Soil

, Volume 379, Issue 1, pp 135–148

Variable effects of nutrient enrichment on soil respiration in mangrove forests

  • Catherine E. Lovelock
  • Ilka C. Feller
  • Ruth Reef
  • Roger W. Ruess
Regular Article

DOI: 10.1007/s11104-014-2036-6

Cite this article as:
Lovelock, C.E., Feller, I.C., Reef, R. et al. Plant Soil (2014) 379: 135. doi:10.1007/s11104-014-2036-6

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.

Keywords

Soil CO2 efflux Nitrogen Phosphorus Avicennia Rhizophora Growth Salinity Carbon cycling 

Supplementary material

11104_2014_2036_MOESM1_ESM.docx (33 kb)
Table S1(DOCX 32 kb)

Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Catherine E. Lovelock
    • 1
  • Ilka C. Feller
    • 2
  • Ruth Reef
    • 1
  • Roger W. Ruess
    • 3
  1. 1.School of Biological SciencesThe University of QueenslandSt LuciaAustralia
  2. 2.Smithsonian Environmental Research CenterEdgewaterUSA
  3. 3.Institute of Arctic BiologyUniversity of Alaska FairbanksFairbanksUSA

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