, Volume 50, Issue 1, pp 73-93

First online:

Throughfall chemistry in a loblolly pine plantationunder elevated atmospheric CO2 concentrations

  • J. LichterAffiliated withDepartment of Botany, Duke University
  • , M. LavineAffiliated withInstitute of Statistics and Decision Science, Duke UniversityNicholas School of the Environment, Duke University
  • , K.A. MaceAffiliated withDepartment of Botany, Duke University
  • , D.D. RichterAffiliated withNicholas School of the Environment, Duke University
  • , W.H. SchlesingerAffiliated withDepartment of Botany, Duke UniversityNicholas School of the Environment, Duke University

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Accelerated tree growth under elevatedatmospheric CO2 concentrations may influencenutrient cycling in forests by (i) increasingthe total leaf area, (ii) increasing the supplyof soluble carbohydrate in leaf tissue, and (iii) increasing nutrient-use efficiency. Here wereport the results of intensive sampling andlaboratory analyses of NH 4 + , NO 3 , PO 4 3− , H+, K+, Na+,Ca2+, Mg2+, Cl, SO 4 2− , and dissolved organic carbon (DOC) in throughfallprecipitation during the first 2.5+ years of the DukeUniversity Free-Air CO2 Enrichment (FACE)experiment. After two growing seasons, a largeincrease (i.e., 48%) in throughfall deposition of DOCand significant trends in throughfall volume and inthe deposition of NH 4 + , NO 3 , H+, and K+ can be attributed to the elevatedCO2 treatment. The substantial increase indeposition of DOC is most likely associated withincreased availability of soluble C in plant foliage,whereas accelerated canopy growth may account forsignificant trends toward decreasing throughfallvolume, decreasing deposition of NH 4 + ,NO 3 , and H+, and increasing deposition of K+ under elevated CO2. Despiteconsiderable year-to-year variability, there wereseasonal trends in net deposition of NO 3 ,H+, cations, and DOC associated with plant growthand leaf senescence. The altered chemical fluxes inthroughfall suggest that soil solution chemistry mayalso be substantially altered with continued increasesin atmospheric CO2 concentrations in the future.

atmosphere-canopy interaction atmospheric CO2 atmospheric deposition dissolved organic carbon FACE experiment loblolly pine (Pinus taeda L.) throughfall chemistry