Above ground plant biomass was measured in a tussock tundra experimental site. The plots were set up in 1981 and have been harvested in previous years (See Shaver and Chapin Ecological Monographs, 61(1), 1991 pp.1-31.) This file contains the biomass numbers for each harvested quadrat.
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Plots were setup in June 1981 with annual fertilization treatments of 10 g/m2 Nitrogen (as NH4NO3) and 5 g/m2 Phosphorous (as triple superphosphate) were applied. Greenhouses and shade houses were annually set up in late May or early June and removed in the end of August or early September. Greenhouses and shade houses were discontinued in 1989. There are 4 replicate blocks, each containing 1 replicate of each of the following treatments.
greenhouse fertilized (GHNP)
Notes: Cassiope was not separated into leaves and stems. Weights for Cassiope were recorded as leaf weights.
Reference Citations: Shaver, G. R. and F. S. Chapin, III. 1991. Production/biomass relationships and element cycling in contrasting arctic vegetation types. Ecological Monographs 61:1-31.
Biomass quadrats, size 20x20 cm, were taken from Toolik tussock site. Five quadrats were randomly located along line transects in each of four replicate blocks in each treatment. All aboveground biomass was clipped in each 20x20 cm quadrat. Aboveground biomass is considered "within" the quadrat if it is associated with a meristem that is within the quadrat. Quadrats were sorted within 24 hours into species and then into tissue type. Depending on the harvest, tissue types can be broad categories, i.e. above and below, or more detailed, i.e. inflorescences, new growth, old growth, etc. The samples were dried at 50-70 degrees C in a drying oven and after several days weighed to nearest milligram. Samples were then returned to Woods Hole for nutrient analysis. Details are given in Shaver and Chapin (Ecological Monographs, 61(1), 1991, pg. 1.)
Log of changes:
8Jan98 Separated comma delimited data from Excel file. JL
10Nov2004 completed the variable description. JL
Version2: Creaded Excel metadata form. Changed title and added attribut table. 10Jan06 JimL
Version 3: Added LTERNET Data Access server proxy for Excel and comma delimited data files.
Version 4: Update LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
Version 5: Updated the metadata sheet to the new form and eml to 2.1 Jim L 9Jul2012
Version 6: Taxonomic coverage data updated. Updated to newer metadata form (with sites sheet). CH March 2013.
Version 7: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 27Jan14
Version 8: Changed Distribution URL since the LTER network DAS system is being discontinued. JimL 9Apr2015
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