uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/fffde8ec33a7e647852281cb1b6ab6cf Susan Bassow Fakhri Bazzaz 2023 English

Tree photosynthesis measurements were made from two canopy access towers on the Prospect Hill Tract, Harvard Forest, Petersham, Massachusetts between July 1991 and October 1992. Four species were observed: Oak - red oak (Quercus rubra); RM - red maple (Acer rubrum); WB - white birch (Betula papyrifera); YB- yellow birch (Betula alleghaniensis).

canopies photosynthesis physiology LTER controlled vocabulary primary production LTER core area Harvard Forest HFR LTER USA HFR default

This dataset is released to the public under Creative Commons CC0 1.0 (No Rights Reserved). Please keep the dataset creators informed of any plans to use the dataset. Consultation with the original investigators is strongly encouraged. Publications and data products that make use of the dataset should include proper acknowledgement.

Creative Commons Zero v1.0 Universal https://spdx.org/licenses/CC0-1.0.html CC0-1.0 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf059 Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.17 -72.17 +42.54 +42.54 340 340 meter 1991 1992 genus Acer species rubrum red maple genus Betula species alleghaniensis yellow birch species papyrifera white birch genus Quercus species rubra red oak complete Information Manager Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 hf-im@lists.fas.harvard.edu Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 https://harvardforest.fas.harvard.edu

The dataset contains 1950 records. Each record represents a single measurement of a leaf in the canopy.

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. hf059-01-leafgas.csv photosynthesis data hf059-01-leafgas.csv 248241 17ab8231d276b8c8920d0786176df9f7 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p05/hf059/hf059-01-leafgas.csv datetime date and time YYYY-MM-DDThh:mm date date YYYY-MM-DD tower refers to the Canopy Access Tower from which measurement was made 1 Tower 1 2 Tower 2 height refers to either the top of the canopy (T) or the sub-canopy (L) heights. The sub-canopy height was the lowest height where there were sufficient leaves accessible from the towers on the canopy trees. L sub-canopy heights T top of the canopy heights species species observed OAK red oak (Quercus rubra) RM red maple (Acer rubrum) WB white birch (Betula papyrifera) YB yellow birch (Betula alleghaniensis) rep at least 5 replicate leaves of each tree were measured in a given 2 hour time period on each observation date. October 3, 1992 has only a limited set of data. replicate hour hour of day with fraction EST nominalHour 0.01 real time time of day hh:mm psn in situ photosynthetic rate of the leaf micromolePerMeterSquaredPerSecond 0.01 real NA missing value cond in situ conductance rate of the leaf micromolePerMeterSquaredPerSecond 0.01 real NA missing value par photosynthetically active radiation (light levels) micromolePerMeterSquaredPerSecond 0.01 real NA missing value lpar ln transformed PAR levels number 0.01 real NA missing value co2 CO2 concentration in the leaf chamber during the measurement in units of ppm dimensionless 0.01 real NA missing value ci calculated internal CO2 concentration in units of ppm dimensionless 0.01 real NA missing value e calculated transpiration rates micromolePerMeterSquaredPerSecond 0.00000001 real NA missing value ci.ca ratio of Ci to CO2 concentration dimensionless 0.01 real NA missing value tleaf leaf temperature measured by a leaf thermocouple touching the underside of the leaf when enclosed in the leaf cuvette celsius 0.01 real NA missing value tair air temperature measured in the cuvette during the measurement celsius 0.01 real NA missing value rh relative humidity (%) measured in the cuvette during the measurement dimensionless 0.01 real NA missing value esleaf calculated vapor pressure of the leaf kilopascal 0.01 real NA missing value eair calculated vapor pressure of the air in the cuvette during the measurement kilopascal 0.01 real NA missing value vpd vapor pressure deficit kilopascal 0.01 real NA missing value 1950 atmosphere short-term measurement