Details and Metadata
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Methods
The methods followed in the creation of the dataset, including description of field, laboratory and processing steps, and quality control procedures
Past Methods (No longer in use)
- Dendrometer logging
Started: 2023-10-01
Ended: 2024-10-12See sampling
Instrumentation: Point Dendrometers (Ecomatik, TOMST)
Software: HoboWare, lolly, R
Dataset Fields
Detailed documentation of the fields comprising the dataset, including the type of measurement, units where applicable, and any controlled vocabularies or code lists present in the data
| Field Name | Caption | Description | Additional Information |
|---|---|---|---|
| baseline | baseline | Initial tree radial displacement of dendrometer sensor | Measurement type: Nominal |
| date | date | Day of measurement | Measurement type: DateTime Date/Time Format: M/D/YYYY |
| diff | diff | Mean daily difference between measured tree radial displacement and baseline displacement for individual dendrometer sensors | Measurement type: Nominal |
| elevation | elevation | Site elevation (m above sea level) | Measurement type: Nominal |
| id | id | Sensor unique identifier | Measurement type: Nominal |
| init_diam | init_diam | Initial measured diameter of study tree | Measurement type: Nominal |
| mean_value | mean_value | Daily mean value of measured radial displacement of dendrometer sensor | Measurement type: Nominal Unit: unavailable |
| sd_value | sd_value | standard deviation of daily radial displacement | Measurement type: Nominal Unit: unavailable |
| sensor_type | sensor_type | Dendrometer sensor type used (Ecomatik vs. TOMST) | Measurement type: Nominal |
| size_class | size_class | Size class of tree: small (less than 15 cm dbh), large (more than 15 cm dbh) or krummholz (treeline position) | Measurement type: Nominal |
| species | species | Species of study tree: ACSA = sugar maple; ABBA = balsam fir | Measurement type: Nominal |
| temperature | temperature | Daily mean temperature recorded by TOMST device | Measurement type: Nominal |
| tree | tree | Unique tree id | Measurement type: Nominal |
| un_id | un_id | Shortened sensor unique identifier | Measurement type: Nominal |
Sampling Equipment
Equipment and software used to collect data, including how that equipment was used.
Past Sampling Equipment (No longer in use)
Dendrometer datalogging
Started: 2023-10-01
Ended: 2024-10-11We selected one elevation transect (Tuckerman’s Ravine) on the Presidential Range in the White Mountains of New Hampshire to test dendrometer performance. Four sites spaced 200 meters in elevation (600 meters asl – 1200 meters asl) on our transect were identified. At each site, eight trees differing in size class were selected on which to place dendrometers. One low elevation site (550 m), and one high elevation subalpine site (1500 m) were subsequently included in our study (6 sites, total n = 52 trees). The small size class included four trees at each site with a diameter at breast height (dbh) between 5-15 cm, and the large size class included four trees with a dbh between 25-35 cm. This was not done at the subalpine krummholz site where all trees where too short for a dbh measurement to be taken. The three lower elevation sites used sugar maple (Acer saccharum) as the focal tree species and the three higher elevations sites used balsam fir (Abies balsamea). On each tree, we attached one expensive traditional point dendrometer device (Ecomatik, Munich, Germany) and one low-cost point dendrometer device (TOMST, Czechia) 50 centimeters apart. Dendrometers record the displacement of attached metal bands as trees grow (radial growth rates); the dendrometers that were used in this study generally have a resolution of ~0.2-0.3 microns. DBH for all trees were measured at the point where each dendrometer was attached to establish the baseline size of the individual tree. Dendrometers were installed in late September 2023 by AMC staff and left in place to record. Final measurements for this project were manually downloaded in October 2024 (with the possibility of extension per agreement by FEMC staff to decommission at a later date).
Frequency: Continuous
Site Characteristics
The spatial extent of the dataset site coverage, and descriptions of the spatial extent and context for the data collection
- Site Description
Tuckerman Ravine, eastern flank of Mt. Washington, New Hampshire within the White Mountain National Forest. Northern hardwood forest transitions to montane spruce-fir and then subalpine krummholz at highest elevations.
Minimum Altitude: 550 meters
Maximum Altitude: 1550 meters