Forest soil CO2 efflux models improved by incorporating topographic controls on carbon content and sorption capacity of soils.

ABSTRACT: Improved models are needed to predict the fate of carbon in forest soils under changing environmental conditions. Within a temperate sugar maple forest, soil CO2 efflux averaged 3.58 µmol m-2 s-1 but ranged from 0.02 to 25.35 µmol m-2 s-1. Soil CO2 efflux models based on temperature and moisture explained approximately the same amount of variance on gentle and steep hillslopes (r2 = 0.506, p < 0.05 and r2 = 0.470, p < 0.05 respectively). When soil carbon content and sorption capacity were added to the models, the amount of explanation increased slightly on a gentle hillslope (r2 = 0.567, p < 0.05) and substantially on a steep hillslope (r2 = 0.803, p < 0.05). Within the organic-rich surface of the mineral soil, carbon content was positively related and sorption capacity was negatively rela

SUBMITTER: Lecki NA 

PROVIDER: S-EPMC7175660 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature