Plot Normalized Difference Vegetation Index (NDVI) from International Polar Year (IPY) 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: Document plot Normalized Difference Vegetation Index (NDVI) for comparison of warming treatments using International Tundra Experiment (ITEX) open top chamber (OTC), for correlation with visual observation of plant phenology, and for comparison to historical phenology (1995-2002). Treatments: control and ITEX OTC warming experiment (1994-2007). Design: 5 replicates of each treatment at dry site and moist site. Sampling frequency: Once per peak season.