01265nas a2200145   4500008004100000245010500041210006900146300001300215490000700228520071200235100001500947700001700962700001900979856012100998       1991                        eng d00aRemote sensing measurements of production processes in grazing lands: the need for new methodologies0 aRemote sensing measurements of production processes in grazing l  a495 -5050 v343 a<p>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</p>1 aDyer, M.I.1 aTurner, C.L.1 aSeastedt, T.R.  uhttp://knz.lternet.edu/content/remote-sensing-measurements-production-processes-grazing-lands-need-new-methodologies