A global trend in belowground carbon allocation: can we use the relationship at smaller scales?

• Published in: Ecology (Durham) 1996-09, Vol.77 (6), p.1750-1755
• Main Authors: Gower, Stith T., Pongracic, Silvia, Landsberg, Joe J.
• Format: Article
• Language: English
• Subjects: Animal and plant ecology; Animal, plant and microbial ecology; Biological and medical sciences; bosques; Carbon; Carbon allocations; clima templado; climat tempere; Ecology; Forest ecology; Forest ecosystems; Forest litter; Forest soils; Forests; foret; Fundamental and applied biological sciences. Psychology; Global carbon budget; Plant roots; Soil ecology; Soils; Synecology; temperate climate; Temperate forests; Terrestrial ecosystems; Wetland ecology
• ISSN: 0012-9658; 1939-9170
• DOI: 10.2307/2265780

We compared independent estimates of total root carbon allocation (TRCA) and fine root net primary production (NPPfr) for temperate forests to total root carbon allocation (TRCA-RN) estimates derived from an empirical model developed by J. W. Raich and K. J. Nadelhoffer for world forests. Measured total root carbon allocation for temperate forests ranged from 233 to 1013 g C· m-2· yr-1and was not correlated to TRCA calculated from the Raich and Nadelhoffer model for world forests. Fine root NPP was not correlated to TRCA-RN; however, a strong correlation was found between NPPfrand TRCA-RN for five control Pinus resinosa natural forests and plantations. The poor correlation between measured TRCA or NPPfrand the estimates may be due to interspecies differences in belowground carbon allocation, variation in foliage: root carbon allocation ratios due to water and nutrient availability, and violations in the carbon budget approach. Using the Raich and Nadelhoffer model to estimate total root carbon allocation and to construct stand carbon budgets for a stand is not an acceptable substitute for measuring soil carbon fluxes.