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The Influence of Epiphylls on Remote Sensing of Humid Forests by Michael Toomey; Dar Roberts; Bruce Nelson is a Environmental Science article available to read on EtoBox.

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## Canopy reflectance modeling EVI Epiphyllslichens, fungi, liverworts, etc. infesting leaf surfacesare found throughout humid forests of the world. It is well understood that epiphylls inhibit light interception by host plants, but their effect on remote sensing of colonized forests has not been examined. Incorporating leaf-level spectra from Terra Firme (primary forest) and Amazonian Caatinga (woodlands/forest growing on nutrient-deficient sandy soils), we used the GeoSAIL model to propagate leaf-level measurements to the canopy level and determine their effect on commonly used vegetation indices. In Caatinga, moderate infestations (50% leaf area epiphyll cover), lowered simulated Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) values by 6.1% and 20.4%, respectively, largely due to near infrared dampening. Heavy infestation (100% cover) simulations exhibited decreases 1.5-2 times greater than those of moderate infestations. For Terra Firme, which are generally less affected by epiphylls, moderate (20% leaf area) and heavy infestations (40%) lowered EVI by 4.4% (S.D. 0.8%) and 8.1% (S.D. 1.5%), respectively. Near infrared and green reflectance wer

Who reads The Influence of Epiphylls on Remote Sensing of Humid Forests?

Author

Michael Toomey; Dar Roberts; Bruce Nelson

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0034-4257)

Published

2009

Language

EN

Field

Environmental Science (Physical Sciences)