The effect of rapid development on soil CO₂ efflux in a cellulosic biofuel stand

Abstract

As awareness of climate change increases, the need for carbon neutral fuel sources is growing. Lignocellulosic biofuel derived from pine trees has been suggested as one potential energy source; however, it requires more research before its efficacy for climate change mitigation can be determined. Due to the large share of forest carbon held in soils and the extensive area of pine plantations in the southeast U.S., a better understanding of plantation soil carbon dynamics is critical for biofuel carbon accounting. This study evaluated the effects of canopy development and productivity on soil CO₂ efflux, a proxy for soil respiration (R_s), in an intensively managed loblolly pine (Pinus taeda) stand over a period from May 2015 to December 2019. We found that leaf area index (LAI) and gross ecosystem production (GEP), as well as meteorological variables, had significant effects on R_s, but that both overall R_s and soil carbon pools did not increase over the course of the study. We thus hypothesize that GEP and LAI had intra-annual effects on R_s, and that the lack of change in R_s is the result of an increase in autotrophic respiration (R_a) that offset a decrease in decomposition of the previous stand’s organic matter.

Citation

Wright-Osment, Nicholas; Starr, Gregory; Aubrey, Doug P.; Rau, Benjamin M.; Staudhammer, Christina L. 2023. The effect of rapid development on soil CO₂ efflux in a cellulosic biofuel stand. Forests. 14(2): 258. https://doi.org/10.3390/f14020258.