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SPRUCE Sphagnum Growth and Photosynthesis Responses to Shading Treatments, 2021


This data set reports growth, water content, nitrogen concentration, and photosynthesis of Sphagnum grown under shade cloth of different density in replicated plots adjacent to the SPRUCE experimental study plots located in the S1-Bog. Data are reported for May to October 2021. This dataset contains three files in comma-separate (*.csv) format. Investigations were instigated from questions arising in the SPRUCE experiment where the Sphagnum-shrub-spruce/larch ecosystem is exposed to air and peat warming in combination with elevated atmospheric CO2. SPRUCE is located at the 8.1-ha S1 Bog forest site in northern Minnesota, 40 km north of Grand Rapids, in the USDA Forest Service Marcell Experimental Forest (MEF).

Thirty plots (35 × 35 cm) were established in May, 2021, in three blocks on unused large plots on the S-1 bog. Data are reported for growth of Sphagnum angustifolium/fallax and S. divinum growing in plastic columns within the shade plots. Growth is reported as dry mass of new tissue measured when the columns were harvested in October 2021. Additional measurements in the final harvest data set include Sphagnum water content, new stem length, mass per unit length, and nitrogen content. Stem extension was measured periodically during the summer and reported in a separate data set as stem length. Photosynthesis of Sphagnum angustifolium/fallax samples from hollows under low and high shade was measured in the laboratory.


Norby RJ, T Baxter, & DJ Weston. 2023. SPRUCE Sphagnum Growth and Photosynthesis Responses to Shading Treatments, 2021. Oak Ridge National Laboratory, TES SFA, U.S. Department of Energy, Oak Ridge, Tennessee, U.S.A. 10.25581/spruce.106/1961626.


Data and Documentation




Thursday, September 14, 2023

SPRUCE ID: spruce.106


A sphagnum growth plot with shade cloth deployed

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