Contrasting responses to drought of forest floor CO2 efflux in a loblolly pine plantation and a nearby Oak-Hickory forest

S. Palmroth; Christopher A. Maier; Heather R. McCarthy; A. C. Oishi; H. S. Kim; Kurt Johnsen; Gabrial G. Katul; Ram Oren

Treesearch

Contrasting responses to drought of forest floor CO₂ efflux in a loblolly pine plantation and a nearby Oak-Hickory forest

Informally Refereed

Authors:

S. Palmroth, Christopher A. Maier, Heather R. McCarthy, A. C. Oishi, H. S. Kim, Kurt Johnsen, Gabrial G. Katul, Ram Oren

Year:

2005

Type:

Scientific Journal

Station:

Southern Research Station

Source:

Global Change Biology 11: 421-434

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Abstract

Forest floor C0₂ efflux (F_ff) depends on vegetation type, climate, and soil physical properties. We assessed the effects of biological factors on F_ff by comparing a maturing pine plantation (PP) and a nearby mature Oak-Hickory-type hardwood forest (HW). F_ff was measured continuously with soil chambers connected to an IRGA during 2001-2002. At both sites, F_ff depended on soil temperature at 5cm (T₅) when soil was moist (soil moisture, 0> 0.20 m3mm-3)a, nd on both T5 and 0 when soil was drier. A model (F_ff( T₅,0 )) explained 292% of the variation in the daily mean F_ff at both sites. Higher radiation reaching the ground during the leafless period, and a thinner litter layer because of faster decomposition, probably caused higher soil temperature at HW compared with PP. The annual Frt was estimated at 1330 and 1464 g Cm

Keywords

belowground carbon allocation, chamber conifer, hardwood, IRGA, litterfall, Pinus taeda L, Quercus ssp, soil respiration, temperate

Citation

Palmroth, S.; Maier, Chris A.; McCarthy, Heather R.; Oishi, A. C.; Kim, H. S.; Johnsen, Kurt H.; Katul, Gabrial G.; Oren, Ram. 2005. Contrasting responses to drought of forest floor CO₂ efflux in a loblolly pine plantation and a nearby Oak-Hickory forest. Global Change Biology 11: 421-434