Effects of nutrient and organic matter manipulation on carbon pools and fluxes in a young loblolly pine varietal stand on the lower coastal plain of South CarolinaThis article is part of a larger document. View the larger document here.
Manipulation of site organic matter and nutrients, in addition to planting of superior genotypes will likely influence carbon fluxes from intensively managed forests. The objective of this research is to monitor total soil carbon dioxide (CO2) efflux (FS), microbial respiration (RH), and leaf gas exchange (PN) in a two-year-old loblolly pine (Pinus taeda L.) stand located on the Lower Coastal Plain of South Carolina, which has undergone logging residue (LR) and nutrient additions. Short-term results showed a 17 percent decrease in stem volume with the addition of LR, and showed only modest improvement with the addition of nitrogen (N) and phosphorous (P). However, fertilizer alone increased stem volume by 40 percent and increased PN in needles produced in 2006. LR and fertilization had no consistent effect on FS, but showed a tendency to increase and decrease RH, respectively. Most notably, varieties showed a significant and sustained difference in FS, which was partially explained by increased RH and fine-root length. These early results suggest that clonal varieties respond differently to site manipulations and nutrient additions and some of these measured responses have implications for long-term C storage.