@inbook {KNZ001125, title = {Estimating aboveground net primary production in grassland and herbaceous dominated ecosystems}, booktitle = {Principles and Standards for Measuring Net Primary Production}, year = {2007}, pages = {27 -48}, publisher = {Oxford University Press, NY}, organization = {Oxford University Press, NY}, abstract = {This paper reviews past and currently accepted methods of estimating aboveground net primary production (NPP) in grass and herb-dominated ecosystems, provides some guiding principles and recommendations to facilitate accurate determination of aboveground NPP, and discusses biases and errors and sampling adequacy. }, keywords = {LTER-KNZ}, author = {Alan K. Knapp and J. M. Briggs and Childers, D.L. and Sala, O.E.} }