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Tree seedling germination, precipitation index, and SWE data for Subalpine forest from 1940 to 2010, yearly

Data set creator(s): Robert Andrus; Thomas Veblen

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For methodology questions, contact Thomas Veblen
University of Colorado Geography Department

Boulder CO 80302

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    1. Use our data freely. All Niwot LTER data products (except some recent data sets for which metadata but not data are available) are released to the public and may be freely copied, distributed, edited, remixed, and built upon under the condition that you provide acknowledgement as described below.

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Annual germination dates for >450 Engelmann spruce and >500 subalpine fir seedlings collected across a complex topographic-moisture gradient were compared to climate variability in the Colorado Front Range. This dataset contains the SPEI (standardized-evaporation precipitation index) and snow-water equivalent (SWE) data from 1940 to 2010 used in the study as well as the number of seedlings establishing each year from 1940 to 2010 by species.


Niwot Ridge (Mountain Research Station, MRS), Brainard Lakes (BL), Boulder Watershed (BW), Rollins Pass (RL).
Plot locations (UTM coordinates in meters, zone 13):
MRS5: easting 450783, northing 4432591, elevation 3280 m.
MRS7: easting 451478, northing 4432502, elevation 3260 m.
MRS13: easting 451146, northing 4433108, elevation 3370 m.
BW2: easting 452155, northing 4439409, elevation 2980 m.
BW3: easting 452095, northing 4429247, elevation 2980 m.
BL1: easting 450375, northing 4436244, elevation 3180 m.
BL2: easting 450350, northing 4436224, elevation 3220 m.
RP1: easting 446009, northing 4419473, elevation 3000 m.
RP2: easting 443596, northing 4420187, elevation 3295 m.

Date Range:

1940 to 2010




May standardized-evaporation precipitation index (SPEI), June SPEI, July SPEI, August SPEI, September SPEI, summer SPEI, snow water equivalent, fir seedlings plot BL1, fir seedlings plot BL2, fir seedlings plot RP1, fir seedlings plot RP3, fir seedlings plot RP4, fir seedlings plot MRS5, fir seedlings plot MRS7, fir seedlings plot MRS13, spruce seedlings plot BL1, spruce seedlings plot BL2, spruce seedlings plot RP1, spruce seedlings plot RP3, spruce seedlings plot RP4, spruce seedlings plot MRS5, spruce seedlings plot MRS7, spruce seedlings plot MRS13, spruce seedlings plot BW2, spruce seedlings plot BL3

Location: Subalpine forest

At a glance:


Location Group: Subalpine forest

Found within: Niwot Ridge (USFS - UNESCO Biosphere Reserve), Green Lakes Valley (City of Boulder Watershed)
Located in: USFS - UNESCO Biosphere Reserve, City of Boulder Watershed, USFS - Arapaho and Roosevelt National Forests
(Click to learn more about these locations)

More data from: Subalpine forest

Core Data Set: No
Discipline: Plant/vegetation ecology, Hydrology, Climatology/meteorology

Data Citation

Andrus, Robert. Veblen, Thomas. 2018. Tree seedling germination, precipitation index, and SWE data for Subalpine forest from 1940 to 2010, yearly. DOI: doi:10.6073/pasta/81dfd2bd8d47708f99479fd33b47fb00

CU Boulder

This material is based upon work supported by the National Science Foundation under Cooperative Agreement #DEB-1637686. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necesarily reflect the views of the National Science Foundation.

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