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 is the July 26-27, 1984 harvest of the controls and nitrogen + phosphorus treatments.
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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. Control (CT) fertilized (NP) greenhouse (GH) greenhouse fertilized (GHNP) shade (SH) 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. Sampling Description. 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.)
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