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Keywords:

  • 13 C ;
  • fine roots;
  • free-air CO2 enrichment (FACE);
  • post-carboxylation fractionation;
  • root respiration;
  • root turnover;
  • stored carbon (C);
  • Liquidambar styraciflua

Summary

  • The relative use of new photosynthate compared to stored carbon (C) for the production and maintenance of fine roots, and the rate of C turnover in heterogeneous fine-root populations, are poorly understood.
  • We followed the relaxation of a 13C tracer in fine roots in a Liquidambar styraciflua plantation at the conclusion of a free-air CO2 enrichment experiment. Goals included quantifying the relative fractions of new photosynthate vs stored C used in root growth and root respiration, as well as the turnover rate of fine-root C fixed during [CO2] fumigation.
  • New fine-root growth was largely from recent photosynthate, while nearly one-quarter of respired C was from a storage pool. Changes in the isotopic composition of the fine-root population over two full growing seasons indicated heterogeneous C pools; < 10% of root C had a residence time < 3 months, while a majority of root C had a residence time > 2 yr.
  • Compared to a one-pool model, a two-pool model for C turnover in fine roots (with 5 and 0.37 yr−1 turnover times) doubles the fine-root contribution to forest NPP (9–13%) and supports the 50% root-to-soil transfer rate often used in models.