Effects of Atmospheric CO₂ Enrichment on Soil CO₂ Efflux in a Young Longleaf Pine System

Table 2

Specific respiration rates (g C respired per g) for root biomass, root C and N and soil C and N.

CO2^a	Root dry weight	Root N	Root C	Soil N	Soil C
Ambient	0.172	34.493	0.375	1.437	0.076
Elevated	0.146	32.262	0.315	1.848	0.098
ANOVA	𝑃=0.03	𝑃=0.32	𝑃=0.02	𝑃<0.01	𝑃<0.01

^aAmbient CO₂≈ 365 μmol mol⁻¹; elevated CO₂≈ 720 μmol mol⁻¹.