General Site Information
Site ID:US-Me2
Site Name:Metolius mature ponderosa pine
Tower Team: PI: Bev Law <> - Oregon State University
PI: Chris Still <> - Oregon State University
FluxContact: Hyojung Kwon <> - Oregon State University
DataManager: Chad Hanson <> - Oregon State University
Technician: Alex Irving <> - Oregon State University
Elevation (m):1253
NetworkAmeriFlux, Phenocam
IGBP:ENF (Evergreen Needleleaf Forests: Lands dominated by woody vegetation with a percent cover >60% and height exceeding 2 meters. Almost all trees remain green all year. Canopy is never without green foliage.)
Mean Annual Temperature (degrees C):6.28
Mean Annual Precipitation (mm):523
Data Products: FLUXNET2015 Dataset
FLUXNET LaThuile Dataset
Data Availability: FLUXNET2015:   13 years (Duration: 2002 - 2014)
FLUXNET LaThuile:   3 years (Duration: 2003 - 2005)
Data Downloads to Date: FLUXNET2015:   2516 unique downloads
FLUXNET LaThuile:   90 unique downloads
Data DOIs: FLUXNET2015 DOI: 10.18140/FLX/1440079
Description:Site Description before Fire (January, 2002 - August, 2020): The mean stand age is 71 years old and the stand age of the oldest 10% of trees is about 108 years old. This site is one of the Metolius core cluster sites with different age and disturbance classes and part of the AmeriFlux network. The overstory is almost exclusively composed of ponderosa pine trees (Pinus ponderosa Doug. Ex P. Laws) with a few scattered incense cedars (Calocedrus decurrens (Torr.) Florin) and has a peak leaf area index (LAI) of 2.1 m2 m-2. Tree height is relatively homogeneous at about 18 m, and the mean tree density is approximately 339 trees ha-1 (Irvine et al., 2008). The understory is sparse with an LAI of 0.2 m2 m-2 and primarily composed of bitterbrush (Purshia tridentata (Push) DC.) and greenleaf manzanita (Arctostaphylos patula Greene). Soils at the site are sandy (69%/24%/7% sand/silt/clay at 0–0.2 m depth and 66%/27%/7% at 0.2–0.5 m depth, and 54%/ 35%/11% at 0.5–1.0 m depth), freely draining with a soil depth of approximately 1.5 m (Irvine et al., 2008; Law et al., 2001b; Schwarz et al., 2004). Green Ridge Fire: On August 20, 2020, the Green Ridge Fire burned through Us-Me2. The fire was ignited by lightning on August 16th, and grew rapidly to the east over the first few days driven by strong, downslope (westerly) afternoon winds. Fire behavior and observed fire effects were highly heterogeneous due to the localized wind pattern carrying the flaming head of the fire forward, and the efforts being made by suppression resources to contain the fire. The site experienced the full range of fire effects, from <1 m high surface fire that charred litter and duff and only consumed shrubs and herbaceous material to full tree (>15 m) crown fire that consumed 100% of needles, small limbs, and surface fuels at high intensity, leaving only ash and bare soil post-fire. Salvage Logging: From late March to late April 2021, salvage logging by the landowner occurred at the site. Almost all trees within the flux footprint were logged except a small area with lower burn severity, where sap flow and automatic soil respiration measurements are continued since the fire.
Acknowledgments:The Metolius AmeriFlux research was supported by the Office of Science (BER), U.S. Department of Energy, Grant No. DE-FG02-06ER64318).
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