HR: 0800h
AN: B51A-0039    [Abstracts]
TI: Plant phenology patterns at three sites on the H.J. Andrews Experimental Forest, Oregon, 1987 to 2007.
AU: * Shaw, D C
EM: dave.shaw@oregonstate.edu
AF: Oregon State University, Department of Forest Science 321 Richardson Hall, Corvallis, OR 97331, United States
AU: Creel, C
EM: creel@fsl.orst.edu
AF: US Forest Serivce, Pacific Northwest Research Station, Forestry Sciences Laboratory 3200 SW Jefferson Way, Corvallis, OR 97331, United States
AU: Downing, G
EM: downing@fsl.orst.edu
AF: US Forest Serivce, Pacific Northwest Research Station, Forestry Sciences Laboratory 3200 SW Jefferson Way, Corvallis, OR 97331, United States
AU: Remillard, S
EM: suzanne.remillard@oregonstate.edu
AF: Oregon State University, Department of Forest Science 321 Richardson Hall, Corvallis, OR 97331, United States
AU: O'Connell, K
EM: kari.oconnell@oregonstate.edu
AF: Oregon State University, Department of Forest Science 321 Richardson Hall, Corvallis, OR 97331, United States
AB: Plant phenology data has been collected at three sites on the H.J. Andrews Experimental Forest, Oregon since the late 1970's. The sites were visited once every three weeks year-round. Current efforts to clean and archive this data are on-going. Here we present on a 20 year data set from 1987 to 2007. The three sites are located at Watersheds (WS) 10, 8, and 7/6, at an elevation of 466 m, 993 m, and 905/950 m respectively. Forests were old growth (WS 8) and regenerating clearcuts (WS 6, 10), or shelterwood clearcut with overstory removed in 1984 (WS 7) dominated by Douglas-fir, western hemlock, true firs, and western redcedar. One tree (Douglas-fir), two evergreen shrubs, three deciduous shrubs, and four herbs were followed for vegetative and flowering phenology, including bud swell, bud bread, leaf expansion, leaf color change, leaf fall, flower bud swell, blooming, petal loss, fruit formation, and seed dispersal. Weather stations are located at each site and tied into a network of stations in this LTER site. Physical factors such as snow depth, snow coverage, freeze-thaw activity, as well as lichen condition were also noted. We are asking two key questions regarding plant phenology patterns. 1. Has the growing season lengthened in the mountainous watershed of the HJ Andrews, and is this similar for a low elevation site (WS 10) versus a mid elevation site (WS 8, 7/6)? 2. Do snow-pack dynamics influence plant phenology more so than temperature (degree days)?
DE: 0438 Diel, seasonal, and annual cycles (4227)
DE: 0476 Plant ecology (1851)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting