Irreconcilable differences: fine-root life spans and soil carbon persistence.
The residence time of fine-root carbon in soil is one of the least understood aspects of the global carbon cycle, and fine-root dynamics are one of the least understood aspects of plant function. Most recent studies of these belowground dynamics have used one of two methodological strategies. In one approach, based on analysis of carbon isotopes, the persistence of carbon is inferred; in the other, based on direct observations of roots with cameras, the longevity of individual roots is measured. We show that the contribution of fine roots to the global carbon cycle has been overstated because observations of root lifetimes systematically overestimate the turnover of fine-root biomass. On the other hand, isotopic techniques systematically underestimate the turnover of individual roots. These differences, by virtue of the separate processes or pools measured, are irreconcilable.
Strand
Allan E
AE
Department of Biology, College of Charleston, Charleston, SC 29424, USA.
Pritchard
Seth G
SG
McCormack
M Luke
ML
Davis
Micheal A
MA
Oren
Ram
R
D001272:Atmosphere; D018533:Biomass; D001901:Botany / Q000379:methods; D002244:Carbon / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis / Q000378:metabolism; D002247:Carbon Isotopes; D002623:Chemistry Techniques, Analytical / Q000379:methods; D008904:Miniaturization; D018517:Plant Roots / Q000737:chemistry / Q000502:physiology*; D012987:Soil / Q000032:analysis*; D013997:Time Factors; D014741:Video Recording
D002247:Carbon Isotopes; D012987:Soil; D002245:Carbon Dioxide; D002244:Carbon