| Id | Type | Site | Dates |
Frequency | Title |
Description |
| 31 |
Tree Survey |
TZ |
2018-06-06 - 2018-06-08 |
Once |
Tree Survey By Miriam |
The survey was a census of 14 circular plots, pseudo-randomly placed in the approximate eddy covariance tower flux footprint (within 500 m from the tower). Plot placement aimed to sample tree species (Quercus douglasii QUDO, Pinus sabiniana PISA) and sizes that were roughly representative of the entire footprint, according to a 2003 lidar survey (itself deemed insufficiently accurate for initialization). Eleven plots had a radius of 13 m and three had a radius of 20 m, for a total area censused of 9,610 m2. In each plot, we measured trees which were > 1.5 m tall. We recorded: geographical location (Trimble GeoXT 6000 with external antenna and ArcPad software, differentially corrected using base station data to an accuracy of <50 cm [75.07% of data], 0.5 - 1 m [17.71% of data], 1 - 2 m, [6.47 % of data], or 2 - 5 m [0.75% of data]), diameter at breast height (DBH), and height (Nikon Forestry Pro laser rangefinder; 3 point method; reported distance accuracy is ± 1 m at distances shorter than 300 m). |
| 32 |
Tree Survey |
TZ |
2018-06-08 |
Once |
Pines for tree rings cores by Miriam |
20 pines (Pinus sabiniana PISA) were measured and cored as part of Jackie Ho's undergrad thesis. We aimed for large trees but not so large that the borer couldn't get to the center. For relatively straight-standing trees and for trees on slopes (which have growth more likely to reflect water deficit). Locations are from a phone GPS, diameter at breast height (DBH), and height (Nikon Forestry Pro laser rangefinder; 3 point method; reported distance accuracy is ± 1 m at distances shorter than 300 m). |
| 33 |
Tree Survey |
TZ |
2019-12-16 |
Once |
DBH and crown size by Miriam and Ana |
Measurements of 20 QUDO & 20 PISA crown diameters (in 2 directions, not necessarily perpendicular) and DBHs. The purpose of data collection was to get a general idea of DBH~crown diameter allometry, but note that these trees were chosen in an ad-hoc manner and were not a random sample. DBH measured with a tape; crown width measured by two people with a tape, looking up to position the ends of the tape appropriately. GPS points from a phone, IDOL alcatel, with the 'GPS coordinates' app. Measurements done 12/16/19. |
| 34 |
Tree Survey |
TZ |
2023-04-26 |
Multi year |
Partial survey of banded trees by Sophie and Megan |
Sophie Ruehr and Megan Hur, 93 of the banded tress were measured and photographed, band increment and circumference. |
