Effects of silviculture practices on trace gas fluxes from soils in a slash pine plantation

Conference · Tue Jun 01 04:00:00 EDT 1993 · Bulletin of the Ecological Society of America; (United States)

OSTI ID:6208179

Castro, M S; Steudler, P A; Melillo, J M; Gholz, H L ^[1]

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1. The Ecosystems Center, Wood Hole, MA (United States) Univ of Florida, Gainesville (United States)

The purpose of this research was to examine the effects of silviculture practices on trace gas fluxes from soils in slash pine plantations. We measured seasonal fluxes of CO[sub 2], N[sub 2]O and CH[sub 4] from urea fertilized and unfertilized soils of a mature Florida slash pine plantation before and after clearcutting. Before clearcutting, urea fertilization significantly increased the emissions of N 20 and lowered the uptake of atmospheric CH[sub 4]. Daily average N[sub 2]O emissions from the fertilized soils (12 to 75 ug N[sub 2]O-N/m[sup 2]-hr) were 8 to 684 times higher than N[sub 2]O emissions from the unfertilized soils. Daily average CH[sub 4] uptake by the fertilized soils (0.001 to 0.007 mg CH[sub 4]-C/m[sup 2]-hr) were 5 to 14 times lower than the CH[sub 4] uptake by the unfertilized soils. After clearcutting, soils in both the cut fertilized and cut unfertilized plots were sources of CH[sub 4]. These emissions coincided with increased soil moisture compared to a control plantation. Nitrous oxide emissions from the cut fertilized plots (up to 7 ug N[sub 2]O-N/m[sup 2]-hr) were much less than N[sub 2]O emissions from these plots before clearcutting. After clearcutting CO[sub 2] emissions from the cut unfertilized soils were approximately 1.5 times lower than CO[sub 2] emissions from an uncut control.

• OSTI ID: 6208179
• Report Number(s): CONF-930798--
• Conference Information: Journal Name: Bulletin of the Ecological Society of America; (United States) Journal Volume: 74:2
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
AGRICULTURE
ALKANES
AMIDES
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONIC ACID DERIVATIVES
CHALCOGENIDES
EMISSION
FERTILIZERS
FORESTRY
GREENHOUSE GASES
HYDROCARBONS
METHANE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SILVICULTURE
SOILS
UREA