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Harold A. Mooney and Richard J. Hobbs At present there is enormous concern about the changes that are occurring on the surface of the earth and in the earth's atmosphere, primarily as a result of human activities. These changes, particularly in the atmosphere, have the potential for altering the earth's habitability. International pro grams unprecedented in scope, including the International Geosphere Biosphere Program, have been initiated to describe and understand these changes. The global change program will call for coordinated measure ments on a global scale of those interactive physical and biological pro cesses that regulate the earth system. The program will rely heavily on the emerging technology of remote sensing from airborne vehicles, particularly satellites. Satellites offer the potential of continuously viewing large seg ments of the earth's surface, thus documenting the changes that are occur ring. The task, however, is not only to document global change, which will be an enormous job, but also to understand the significance of these changes to the biosphere. Effects on the biosphere may cover all spatial scales from global to local. The possibility of measuring biosphere function remot‾ly and continuously from satellite imagery must be explored quickly and thoroughly in order to meet the challenge of understanding the con sequences of global change. Initial guidelines and approaches are currently being formulated (Dyer and Crossley, 1986; JOI, 1984; NAS, 1986; Rasool, 1987). There are many conceptual and technical issues that must be resolved H. A. Mooney and R. J.
Contents
1. Introduction.- 2. Remote Sensing of Terrestrial Ecosystem Structure: An Ecologist's Pragmatic View.- 3. Measurements of Surface Soil Moisture and Temperature.- 4. Estimating Terrestrial Primary Productivity by Combining Remote Sensing and Ecosystem Simulation.- 5. Remote Sensing of Litter and Soil Organic Matter Decomposition in Forest Ecosystems.- 6. Water and Energy Exchange.- 7. Evaluation of Canopy Biochemistry.- 8. Remote Sensing and Trace Gas Fluxes.- 9. Satellite Remote Sensing and Field Experiments.- 10. Remote Sensing of Spatial and Temporal Dynamics of Vegetation.- 11. Remote Sensing of Landscape Processes.- 12. Synoptic-Scale Hydrological and Biogeochemical Cycles in the Amazon River Basin: A Modeling and Remote Sensing Perspective.- 13. Remote Sensing of Marine Photosynthesis.- 14. Analysis of Remotely Sensed Data.- 15. Remote Sensing of Biosphere Functioning: Concluding Remarks.
