Fine root respiration in the mangrove Rhizophora mangle over variation in forest stature and nutrient availability

Lovelock, Catherine E., Ruess, Roger W. and Feller, Ilka C. (2006) Fine root respiration in the mangrove Rhizophora mangle over variation in forest stature and nutrient availability. Tree Physiology, 26 12: 1601-1606. doi:10.1093/treephys/26.12.1601

Author Lovelock, Catherine E.
Ruess, Roger W.
Feller, Ilka C.
Title Fine root respiration in the mangrove Rhizophora mangle over variation in forest stature and nutrient availability
Journal name Tree Physiology   Check publisher's open access policy
ISSN 0829-318X
Publication date 2006-12-01
Year available 2006
Sub-type Article (original research)
DOI 10.1093/treephys/26.12.1601
Open Access Status Not Open Access
Volume 26
Issue 12
Start page 1601
End page 1606
Total pages 6
Editor Rozanne Poulson
Place of publication Oxford, U.K.
Publisher Oxford University Press
Language eng
Subject C1
270402 Plant Physiology
770302 Living resources (incl. impacts of fishing on non-target species)
Abstract Root respiration uses a significant proportion of photosynthetically fixed carbon (C) and is a globally important source of C liberated from soils. Mangroves, which are an important and productive forest resource in many tropical and subtropical countries, sustain a high ratio of root to shoot biomass which may indicate that root respiration is a particularly important component in mangrove forest carbon budgets. Mangroves are often exposed to nutrient pollution from coastal waters. Here we assessed the magnitude of fine root respiration in mangrove forests in Belize and investigated how root respiration is influenced by nutrient additions. Respiration rates of excised fine roots of the mangrove, Rhizophora mangle L., were low (4.01 +/- 0.16 nmol CO2 g(-1) s(-1)) compared to those measured in temperate tree species at similar temperatures. In an experiment where trees where fertilized with nitrogen (N) or phosphorus (P) in low productivity dwarf forests (1-2 m height) and more productive, taller (47 m height) seaward fringing forests, respiration of fine roots did not vary consistently with fertilization treatments or with forest stature. Fine roots of taller fringe trees had higher concentrations of both N and P compared to dwarf trees. Fertilization with P enhanced fine root P concentrations in both dwarf and fringe trees, but reduced root N concentrations compared to controls. Fertilization with N had no effect on root N or P concentrations. Unlike photosynthetic C gain and growth, which is strongly limited by P availability in dwarf forests at this site, fine root respiration (expressed on a mass basis) was variable, but showed no significant enhancements with nutrient additions. Variation in fine root production and standing biomass are, therefore, likely to be more important factors determining C efflux from mangrove sediments than variations in fine root respiration per unit mass.
Keyword Belize
Potential growth-rate
Nitrogen concentration
Soil respiration
Q-Index Code C1
Institutional Status UQ

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Created: Wed, 15 Aug 2007, 19:42:29 EST