title: Fine root turnover in forest ecosystems in relation to quantity and form of nitrogen availability: a comparison of two methods.
abstract: Two methods of estimating fine root production and turnover are compared for 13 forest ecosystems exhibiting a wide range in form (NH4+vs. NO3-) and quantity of available nitrogen. The two methods are by comparison of seasonal maxima and minima in biomess and by nitrogen budgeting. Both methods give similar results for stands with low rates of nitrification. The budgeting method predicts higher fine root turnover and productivity than the max-min method for systems with significant rates of nitrification.
authors.affiliation: Department of Forestry, University of Wisconsin-Madison, 53706, Madison, WI, USA.
authors.forename: John D
authors.initials: JD
authors.lastname: Aber
authors.affiliation: Marine Biological Laboratory, Ecosystem Center, 02543, Woods Hole, MA, USA.
authors.forename: Jerry M
authors.initials: JM
authors.lastname: Melillo
authors.affiliation: Marine Biological Laboratory, Ecosystem Center, 02543, Woods Hole, MA, USA.
authors.forename: Knute J
authors.initials: KJ
authors.lastname: Nadelhoffer
authors.affiliation: Department of Biology, Virginia Polytechnic Institute and State University, 24061, Blacksburg, VA, USA.
authors.forename: Charles A
authors.initials: CA
authors.lastname: McClaugherty
authors.affiliation: Environmental Sciences Division, Oak Ridge National Laboratory, 37830, Oak Ridge, TN, USA.
authors.forename: John
authors.initials: J
authors.lastname: Pastor