THE FRAGMENTATION OF FORESTED LANDSCAPES IS A UBIQUITOUS, ONGOING GLOBAL PHENOMENA. GLOBALLY, AN ESTIMATED 20% OF FORESTS ARE WITHIN 100M OF THE FOREST EDGE AND 70% ARE WITHIN 1KM OF AN EDGE. IN SOUTHERN NEW ENGLAND'S HIGHLY DEVELOPED LANDSCAPE, ~25% OF FORESTS ARE &LT;30M FROM A FOREST EDGE. RECENT FIELD OBSERVATION SHOW THAT FORESTS IN THESE FRAGMENTED LANDSCAPES DIFFER IN THEIR VEGETATION DENSITY, PRODUCTIVITY, AND THEIR RESPONSE TO HEAT STRESS AS A FUNCTION OF DISTANCE FROM THE EDGE. HOWEVER, OUR MODELS FOR HOW FORESTED ECOSYSTEMS FUNCTION DO NOT CURRENTLY CAPTURE THE EFFECTS OF FRAGMENTATION. THIS PROJECT WILL SYSTEMATICALLY ASSESS HOW PATTERNS OF DEVELOPMENT AND LAND-USE ADJACENCIES AFFECT TERRESTRIAL CARBON STORES AND FLUXES, WITH A PARTICULAR EMPHASIS ON EDGE AND FRAGMENTATION EFFECTS. RECENT MEASUREMENTS OF VEGETATION SOLAR-INDUCED FLUORESCENCE (SIF) OFFER A MEANS TO DRAMATICALLY IMPROVE MEASUREMENT OF VEGETATION PRODUCTIVITY WITH BOTH HIGH FREQUENCY AND ACROSS BROAD SPATIAL EXTENTS. THIS PROJECT COMBINES MEASUREMENTS OF SIF AND GROUND-BASED MEASUREMENTS ACROSS THE NORTHEAST US TO CHARACTERIZE HOW VEGETATION PRODUCTIVITY VARIES ACROSS FRAGMENTED, DEVELOPED LANDSCAPES. USING A SPATIALLY NESTED SUITE OF OBSERVATIONS WE WILL TEST THE GENERALIZABILITY OF EDGE-RELATED CHANGES IN PRODUCTIVITY AND RESPONSES TO CLIMATE STRESS ACROSS A BROAD RANGE IN CLIMATE CONDITIONS AND SPECIES COMPOSITION THROUGHOUT THE NORTHEAST STUDY REGION. ON A REGIONAL SCALE, WE WILL QUANTIFY LANDSCAPE VARIATIONS IN STRUCTURE AND PRODUCTIVITY AS A FUNCTION OF LAND USE, ADJACENCY, AND PROXIMITY TO FOREST EDGES. AS A WHOLE, THIS WORK SPANS FROM REGIONAL TO LOCAL TO LEAF-LEVEL OBSERVATIONS ALL GEARED AT CHARACTERIZING THE BROAD EFFECTS OF LANDSCAPE FRAGMENTATIONS AND ITS IMPLICATIONS FOR THE SIF SIGNAL ACROSS ALL THESE SCALES. OUR ANALYSIS ALONG LAND USE GRADIENTS OFFERS AN OPPORTUNITY TO ADVANCE ECOLOGICAL THEORY ON VEGETATION RESPONSES TO STRESS AND FRAGMENTATION, AS WELL AS INFORM NEXTGENERATION PRODUCTS OF PHOTOSYNTHETIC CARBON UPTAKE ACROSS COMPLEX MANAGEMENT GRADIENTS USING REMOTE SENSING.