Leaf CNP and isotopes 13C 15N and 18O from International Tundra Experiment (ITEX) Cross Site Comparison

Study sites: Toolik Lake Field Station Alaska, USA 68.63 N, 149.57 W; Atqasuk, Alaska USA 70.45 N, 157.40 W; Barrow, Alaska, USA 71.30 N, 156.67 W; Latnjajaure, Sweden 68.35 N, 18.50 E; Falls Creek, Australia: Site 2-unburned 36.90 S 147.29 E; Site 3-burned 36.89 S 147.28 E. Additional sites will be added summer 2008, but the exact sites are not finalized. Purpose: Collect leaf and soil material to evaluate ecosystem, nutrient cycling change effects of long term warming from across the International Tundra Experiment (ITEX) network. Treatments: control and ITEX open-top chamber (OTC) warming experiment. Design: 5 replicates of each treatment at dry site and moist site. Sampling frequency: Once per peak season.