THE DEVELOPMENT OF SPECTRO-SIGNATURE INDICATORS OF ROOT DISEASE IMPACT ON FOREST STANDS

摘要

Remote sensing research to Identify parameters that best discriminate healthy Douglas-fir trees from those infected with Poria weiril root-rot was continued in 1969. Biophysiological investigations were emphasized to gather data on emitted radiation from the two types of tree crowns (healthy and diseased).nRemote sensing in the thermal infrared region shows great promise for the early detection of root-rot infected trees. More substantiating data are needed, however, on the period of the day and season of the year for using thermal infrared to detect such trees.nAn aerial tramway system was designed and installed for use as a remote sensing platform from which to record continuous data. Two trams were needed because of the difficulties involved in aligning trees in the natural Second-growth stand over which environmental data would be taken.