Eunshik Kim College Of Forestry, Department of Forest Resources, Kookmin University

861-1 Chongnung-Dong Songbuk-gu Seoul 136-702 Republic Of Korea

Hubbard Brook Experimental Forest LTER

U.S. Forest Service 271 Mast Rd. Durham NH 03824 USA

603-868-7643 603-868-7604 http://www.hubbardbrook.org Herb Bormann associated researcher vegetation core tree ring increment dendrochronology

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http://www.hubbardbrook.org/data/dataset.php?id=55 Below WS4. The study site was selected at a stand (approximately 2 ha in area) below WS4. The slope of the site is 10-20 deg. facing southeast. Site elevation is 445-480 m. -71.737183 -71.687683 43.958370 43.939945 445 480 meter Year 1985 Year 1986

The purpose of the study was to compare these time series with a selection of measured and derived environmental variables to develop a more sensitive model of tree diameter growth.

John Campbell

PO Box 640 Durham NH 03824 USA

(603)-868-7643 jlcampbell@fs.fed.us U.S Forest Service

U.S. Forest Service 271 Mast Rd. Durham NH 03824 USA

603-868-7643 603-868-7604 http://www.hubbardbrook.org Hubbard Brook LTER

During the winter of 1985-1986, 145 trees were selected from dominant and co-dominant trees of the 4 species at the study site. Each specie included at least 30 trees. Two cores were taken from each tree using an increment borer (0.5 cm in diameter). To reduce the variability due to slope, they were taken from two directions perpendicular to slope at the height of 1.0-1.2 m above ground. In coring, efforts were made to pass through the pith of stem. The cores were dried and glued onto wood mounts, then air-dried and fine sanded. Tree ring widths were initially measured using a Measuchron. In order to reduce error in dating the age of each core, the cores were cross-dated by checking the correspondence of growth patterns in some typical years using microscope examination and computer graphics.

Time series of annual tree ring increments were collected for trees of four species: beech, white ash, yellow birch, and sugar maple. The purpose of the study was to compare these time series with a selection of measured and derived environmental variables to develop a more sensitive model of tree diameter growth.

Eunshik. Kim 1988 english PhD Yale University 201 uid=HBR,o=lter,dc=ecoinformatics,dc=org all public read treecoredat Tree core increments data at Hubbard Brook lter treecoredata.txt ASCII 1 \n\r column , http://www.hubbardbrook.org/data/data_policy.php?firstname=metacat&lastname=user&affiliation=Other&view=1&accept=1&comments=none&phone=6035551212&email=none@loopback.com&target=treecoredata.txt

How to read sample data: ID__TR__P__S__ST__D__AG__YR__FR____T_______R________DATE 1___1___1__2__1___1__92__90__1985__190.25__188.005__09-18-1986 2___1___1__2__1___2__92__81__1985__173.36__158.388__09-19-1986 No 1 tree, species 2, in plot 1, site 1. Two cores were taken from the tree. For the first core, only 90 rings were read and two rings were not separately read. For the second core, only 81 rings were read and eleven rings were not separately read. The age of the tree was estimated to be 92 years. By the difference of the T (total estimated radius), the stem seems to have a non-concentric circle. The data is physically located at the USDA Forest Service, Durham, NH and was last updated in 1986.

ID Tree ID A > 0 integer tree identifier YEAR Year of radical increment YYYY 1 year 1894 1985 INC_MM Width of radial increment measured in mm millimeter .001 real treecoreinfo Tree core info treecoreinfo.txt ASCII 1 \n\r column , http://www.hubbardbrook.org/data/data_policy.php?firstname=metacat&lastname=user&affiliation=Other&view=1&accept=1&comments=none&phone=6035551212&email=none@loopback.com&target=treecoreinfo.txt

How to read sample data: ID__TR__P__S__ST__D__AG__YR__FR____T_______R________DATE 1___1___1__2__1___1__92__90__1985__190.25__188.005__09-18-1986 2___1___1__2__1___2__92__81__1985__173.36__158.388__09-19-1986 No 1 tree, species 2, in plot 1, site 1. Two cores were taken from the tree. For the first core, only 90 rings were read and two rings were not separately read. For the second core, only 81 rings were read and eleven rings were not separately read. The age of the tree was estimated to be 92 years. By the difference of the T (total estimated radius), the stem seems to have a non-concentric circle. The data is physically located at the USDA Forest Service, Durham, NH and was last updated in 1986.

ID Tree core ID A > 0 integer tree core identifier TR Tree number A > 0 integer tree number P Plot A counting number plot identifier Number from 1-5 S Species 1 Fraxinus americana 2 Fagus grandifolia 3 Acer saccharum 4 Betula allegheniensis ST Site A > 0 integer identifying the site number D Direction (2 cores per tree) (see methods) 1 Direction 1 2 Direction 2 AG (Estimated) total age (in years) number 1 natural YR Reliable number of years for reading the increments number 1 natural FR Initial year to read cores YYYY 1 1985 1985 T Total (estimated) radius read millimeter .01 real R Reliable radius of the cores read for YR years millimeter .001 real DATE Date the core was read MM-DD-YYYY 1 day 09-18-1986 10-24-1986