uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/5ecbf08f2309fca9b20c593424d10988 Aaron Ellison https://orcid.org/0000-0003-4151-6081 Audrey Barker Plotkin https://orcid.org/0000-0002-4473-9785 Researcher Rachel Stahr Researcher Greta VanScoy Researcher 2023 English

Every 15 m in each of the 8 experimental plots in the Simes Tract (i.e., at coordinates [15,15], [15,30], ... , [75, 60], [75.75]), we take a photograph of the canopy using a Nikon 8mm fish-eye lens mounted on a Nikon F3 (non-digital) camera. The camera is mounted on a tripod and positioned 1-2 m above ground. The camera is leveled (using self-leveling gimbals) and oriented with magnetic north at the top of the negative. For archival purposes, we use Kodak T-max 100 or T-max 400 black-and-white negative film. Negatives are individually cut, mounted, labeled, and scanned (300 dpi) for analysis. Original negatives (in acid-free slide sheets) and scans (on compact disks) are deposited in the Harvard Forest archives. Digital scans are analyzed using HemiView 2.1 SR1 software for canopy photograph analysis (Delta-T Devices, Ltd., UK: http://www.delta-t.co.uk). For analysis purposes, latitude was set at 42.47, longitude was set at -72.22, altitude was set at 200m a.s.l., declination was set at -14 degrees. Lens calibration file (Linear 180) was provided within the software. Beginning in September 2008, canopy photos were taken digitally using a Nikon D-3 digital camera body. We continue to use the same lens (Nikon 8mm AI fisheye lens) for images. From 2010 onward, Plot 7 no longer includes photo points [75,15], [75,30], [75,45], [75,60], and [75,75]

Anderson, M. C. 1964. Light relations of terrestrial plant communities and their measurment. Biological Reviews 39: 425-486. Delta-T Devices, Ltd. 1999. HemiView Manual Revision Number 2.1. Delta-T Devices, Ltd., Cambridge, U.K. Rich, P.M. 1989. A manual for analysis of hemispherical canopy photography. Los Alamos National Laboratory Report LA-11733-M. Rich, P.M., D.B. Clark, D.A. Clark, and S.F. Oberbauer. 1993. Long-term study of solar radiation regimes in a tropical wet forest using quantum sensors and hemispherical photography. Agricultural and Forest Meteorology 65: 107-127. The file hf107-02-sites.csv can be imported into HemiView software, version 2.1, to pre-define locations at Harvard Forest where canopy photos have been taken.

Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 https://harvardforest.fas.harvard.edu https://ror.org/059cpzx98 pointOfContact The Harvard Forest Long-Term Ecological Research (LTER) program examines ecological dynamics in the New England region resulting from natural disturbances, environmental change, and human impacts. National Science Foundation LTER grants: DEB-8811764, DEB-9411975, DEB-0080592, DEB-0620443, DEB-1237491, DEB-1832210. hf107-01-light.csv light data hf107-01-light.csv 562682 144cb3db6e6b3df5e54ab27997f1a901 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p10/hf107/hf107-01-light.csv date date photograph taken YYYY-MM-DD leaf deciduous trees’ leaves off or on off leaves off on leaves on treatment treatment pretreatment pretreatment girdle girdled log logged hemlock.control hemlock control hardwood.control hardwood control block block 1 valley: plots 1-3, 8 2 ridge: plots 4-7 plot plot number of the Simes Tract Hemlock Removal Experiment plot number of the Simes Tract Hemlock Removal Experiment x x-coordinate location, in meters, of the sample. Each plot of the Simes Tract is 90 x 90 m. meter 1 natural NA missing value y y-coordinate location, in meters, of the sample. Each plot at the Simes Tract is 90 x 90 m. meter 1 natural NA missing value gsf estimated proportion of global radiation (direct plus diffuse) under a plant canopy relative to that in the open (range: 0 – 1). number .001 real 0 1 NA missing value dsf estimated proportion of direct solar radiation reaching a given location, relative to that in a location with no sky obstruction (range: 0 – 1). number 0.001 real 0 1 NA missing value isf estimated proportion of diffuse solar radiation reaching a given location, relative to a location with no sky obstruction (range: 0 – 1). number 0.001 real 0 1 NA missing value tot_be estimated total radiation below the canopy, corrected for interception surface orientation (units: MJ m-2 yr-1) (range: greater than 0). megajoulePerMeterSquaredPerYear 1 natural 0 NA missing value dir_be estimated direct radiation below the canopy, corrected for interception surface orientation (units: MJ m-2 yr-1) (range: greater than 0). megajoulePerMeterSquaredPerYear 1 natural 0 NA missing value lai estimated leaf area index for the entire canopy (range: greater than 0) number 0.001 real 0 NA missing value gndcover estimated overall fraction of ground covered by canopy (range: 0 – 1). number 0.001 real 0 NA missing value lai_dev estimated uniformity of the canopy across the image (range: greater than 0) number 0.001 real 0 NA missing value threshold user-specified value used to classify the image into black and white pixels (range 0 – 255) number 1 natural 0 255 NA missing value 6838 hf107-02-sites.csv sites hf107-02-sites.csv 272 4d99c0d44876e99317f8813c203d218d 2 \r\n column , https://harvardforest.fas.harvard.edu/data/p10/hf107/hf107-02-sites.csv SiteName short version of site name short version of site name NA missing value Description longer description of site name longer description of site name NA missing value Lat latitude in degrees N number 1 real NA missing value Long longitude in degrees W number 1 real NA missing value Alt elevation in m a.s.l number 1 natural NA missing value Decl declination (degrees W of N) number 1 natural NA missing value 2 plot long-term measurement https://harvardforest.photoshelter.com/galleries/C0000SC1rT7OEoBU/Canopy-Photos https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf083 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf106 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf081 megajoulePerMeterSquaredPerYear