Sapflow and xylem water isotopes from Snodgrass Mountain, East River Watershed, Colorado USA. Space and time dynamics of transpiration in the East River watershed: biotic and abiotic controls

Creators: Berkelhammer M

Year: 2023

License: See source for details

Location: These data were collected at 28 sites along the Snodgrass Mountain trail in the East River Watershed of Colorado USA (https://www.alltrails.com/trail/us/colorado/snodgrass-mountain-trail). The trail begins near Gothic Road in meadow conditions and then climbs through aspen groves before transitioning to conifers (spruce and fir). Each of the sites provided in this data package is located within 50-100 meters on the right side of the Snodgrass Mountain trail that begins where the Gothic Road transitions from paved to dirt. The Snodgrass Mountain trail ends at the weather station at the top of the Mountain and this is the site of the uppermost trees that are instrumented. The latitude and longitude of each measurement is included with the data files and the trees can be easily located by identifying the solar panels attached to each of the trees.

Temporal extent: 2019-05-01 to 2022-09-30

Bounding box: 38.921°N to 38.958°N, -106.987°W to -106.963°W

Publisher: RMBL

Tags: ecohydrology, trees, transpiration, water isotopes, sap flux, Subsurface hydrology, Vadoze zone, CATEGORICAL:NONE Sapflux velocity, Water isotope ratios, Alpine & Subalpine Ecology, Forest Ecology, Hydrology & Watersheds, Groundwater, Soil Science, Geochemistry & Isotopes, Weather & Atmospheric Science, Recreation & Tourism, Field Methods & Monitoring, Gunnison Basin

Description

This dataset includes sapflux and stable water isotopes of soil water and xylem water for aspen, fir and spruce trees along the Snodgrass Mountain transect in the East River Watershed, Colorado USA. The purpose of generating this dataset was to understand: (1) the total flux of water being used by trees in the watershed, (2) separate the component of transpiration that was derived from recent precipitation vs. older water such as winter precipitation of groundwater and (3) understand how total water use and water sources for the trees varies between species and position on a hillslope. The data were collected from May 2019 until October 2022. The sap flux data were collected using ICT SFM1 sensors and are presented in both units of cm hr-1 and as mm hr -1 by multiplying the sap flux by the sapwood area of the tree. All sap flow data has been been corrected using estimates of wounding diameter, water content of wood and sap wood depth. The xylem water isotope data were collected approximately weekly from each of the trees instrumented with sap flux. The stems were collected and the water extracted using classic cryogenic methods. Isotope measurements were done using a Picarro 2140i analyzer. We provide an estimate of the Seasonal Origin Index for each measurements following Allen et al., 2019 (10.5194/hess-23-1199-2019) where values of -1 equate to trees relying on winter precipitation and +1 tree relying on summer precipitation. We also provide the simultaneous sap flux for each isotope measurement when this data was available. Please note this is an update to an earlier data repository with the same name that only included 2019 data. The new dataset was posted in January 2023 and is inclusive of the original 2019 data but now includes 2021 and 2022 data.

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