%0 Journal Article %J Agriculture, Ecosystems and Environment %D 1991 %T Remote sensing measurements of production processes in grazing lands: the need for new methodologies %A Dyer, M.I. %A Turner, C.L. %A Seastedt, T.R. %X

Remote sensing of grazinglands to obtain estimates of productivity relies entirely upon absorption and reflectance properties of the vegetation and its background to provide accurate qualitative and quantitative values. Interpretations of these signals are highly dependent on vegetation responses to perturbations, such as grazing or alterations in nutrient cycles. If remote sensing models of grassland growth ignore feedbacks derived from grazing animals, or only negative feedbacks are assumed, there is a likelihood of errors developing during model validation. We review fundamental assumptions made when using remote sensing data from grazing systems and give examples of the problems involved

%B Agriculture, Ecosystems and Environment %V 34 %P 495 -505 %G eng %M KNZ00314 %R 10.1016/0167-8809(91)90132-H