uid=HFR,o=lter,dc=ecoinformatics,dc=org
all
public
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doi:10.6073/pasta/5a5db21a15e429ce5015c2bc2cbc7ff9
Tree Growth and Above-Ground Biomass at Harvard Forest HEM and LPH Towers since 2001
David
Orwig
https://orcid.org/0000-0001-7822-3560
Julian
Hadley
Mark
VanScoy
Researcher
Liza
Nicoll
Researcher
2024
English
Tree diameter (“dbh”) at 1.25 m above ground were recorded and stainless steel dendrometer bands for trees above 10 cm dbh were attached. Increases in tree diameter were calculated from increases in the distance between holes punched in the dendrometer bands. Tree diameters and diameter increases were used to estimate aboveground biomass and aboveground carbon storage in order to characterize the forest at the flux tower sites, and to quantify the amount of carbon being stored aboveground annually.
aboveground biomass
carbon
tree growth
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=hf149
Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum.
-72.185
-72.180
+42.542
+42.539
355
380
meter
2001
2023
ongoing
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
Initial tree circumferences and diameters were measured at 1.25 m above the ground, and stainless steel dendrometer bands are then fitted to the trees at this height. Each dendrometer band has two small holes punched in the band, around the point at which the band begins to overlap itself. A stainless-steel spring holds the band snugly around the tree. The distance between the two holes is measured with a digital caliper at least once annually, in late October or November, and the annual increase in tree circumference is calculated by subtracting the reading during the previous autumn from the current reading. This circumference increase is converted to a diameter increase, with the assumption that the tree is circular in cross-section. Allometric equations (see data set HF 069-16) are used to calculate a dry aboveground biomass estimate for each tree in each year, from the diameter at 1.25 m. Carbon is assumed to form 50% of dry aboveground biomass.
Hemlock
Circular plots of 6 m radius were established at distances of 50, 100, 150 and 200 m from the Harvard Forest Hemlock eddy flux tower in March 2001, along transects with compass bearings from 180 to 315 degrees, by 15-degree increments. Tree diameters within the plots were measured and dendrometer bands were fitted to all trees greater than 15 cm diameter at breast height. Dendrometer band measurements to calculate circumferential increase were made several times per year during 2001 and 2002 and once to twice annually until 2012. Starting in 2012 measurements are taken monthly during the growing season. Tree mortality was also noted.
Little Prospect Hill (LPH)
Circular plots of 6 m radius were established at distances of 50, 100, and 150 m from the flux tower in March 2002, along transects with compass bearings of 195 to 330 degrees. Plots with a larger radius of 9 m were established at 200 m, 300 m and later 400 m along the same transects. (Plots at greater distances were larger owing to larger tree sizes and lower stem density at these distances.) In late 2003, new plots were established along a transect at a 345-degree compass bearing from the tower, and measurements were discontinued on plots with 195- and 210-degree compass bearings from the tower. This change was made because examination of eddy flux data from 2002 and 2003 showed that valid carbon exchange measurements could not be obtained with wind directions below 215 degrees, and since aboveground biomass estimates were designed primarily for comparison with eddy flux measurements, biomass increments at 195 and 210 degrees were not useful. Dendrometer band installation and measurements at plots near the LPH tower was similar to those at hemlock. Measurements were discontinued in 2010.
Harvard Forest Long-Term Ecological Research
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.
hf149-01-hem-dendro.csv
Hemlock dendrometer
hf149-01-hem-dendro.csv
748782
02ce9733581671019d262c743a7f6c8a
1
\r\n
column
,
https://harvardforest.fas.harvard.edu/data/p14/hf149/hf149-01-hem-dendro.csv
date
date of measurement
YYYY-MM-DD
plot
unique plot identifier represents transect (compass bearing, degrees from north, of transect on which plot occurs) and distance (in meters) from Hemlock tower base
plot
NA
missing value
tag
tree tag number
tree tag number
NA
missing value
ctfs
CTFS tag number if tree is located in the CTFS plot
CTFS tag number if tree is located in the CTFS plot
NA
missing value
species_code
tree species code
tree species code
NA
missing value
band
dendrometer band number
dendrometer band number
NA
missing value
dbh_i
DBH of tree when dendrometer band was installed
centimeter
0.1
real
NA
missing value
f_dbh_i
flag for DBH_i. C = calculated DBH. No flag = DBH measured when the band was installed
flag for DBH_i
NA
missing value
caliper_mm
distance between holes in diameter band. NA indicates tree is dead.
millimeter
0.01
real
NA
missing value
15455
hf149-02-lph-dendro.csv
Little Prospect Hill dendrometer
hf149-02-lph-dendro.csv
206745
d0d7e63b9a7454b982eb1cf76d3b1439
1
\r\n
column
,
https://harvardforest.fas.harvard.edu/data/p14/hf149/hf149-02-lph-dendro.csv
date
date
YYYY-MM-DD
year
year
YYYY
doy
day of year
nominalDay
1
whole
distance
distance from LPH tower base
meter
1
natural
NA
missing value
transect
compass bearing (degrees from north) of transect on which plot occurs
degree
1
whole
NA
missing value
plot_radius
radius of the plot containing the tree
meter
1
natural
NA
missing value
species
genus and species of tree. For genus, A = Acer, B = Betula, F = Fagus, P = Pinus, Q = Quercus
genus and species of tree
id
tag number or, in case of duplicate tag numbers, tag number plus 1000
ID number
orig_circ
circumference at 1.25 m when tree was first measured, just prior to first measurement of dendrometer band
centimeter
0.1
real
NA
missing value
dend_meas
distance between holes in diameter band
centimeter
0.01
real
NA
missing value
repunch
whether band was repunched
0
acceptable for growth calculation
1
repunched or new dendrometer band
3587
plot
long-term measurement
https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf069