February 28, 2007
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FROM VOLUME 11, NUMBER 7, JULY 1998
"Boreal Forest Plants Take up Organic Nitrogen," T. Nasholm
(Dept. Forest Genetics, Swed. Univ. Agric. Sci., S-901 83 Umeå,
Sweden; e-mail: Torgny.Nasholm@genfys.slu.se), A. Ekblad et al.,Nature,
392(6679), 914-916, Apr. 30, 1998.
Plant growth in the boreal forest is generally limited by the
availability of N, presumably because of the slow mineralization of soil
organic N. This study of two tree species, a shrub, and a grass shows,
however, that these plants bypass N mineralization. Results have
major implications for our understanding of the effects of N deposition,
global warming and intensified forestry.
"Global Distribution of Nitrous Oxide Production and N Inputs in
Freshwater and Coastal Marine Ecosystems," S.P. Seitzinger (Inst.
Marine Sci., Rutgers Univ., New Brunswick NJ 08901; e-mail:
email@example.com), C. Kroeze,Global Biogeochem. Cycles, 12(1),
93-113, Mar. 1998.
Globally, rivers and estuaries could account for about 20% of the
current global anthropogenic N2O emissions. They are
comparable to a number of previously identified sources, including direct
emissions of N2O from soils induced by anthropogenic N inputs.
"The Nitrogen Cost of Food Production: Norwegian Society," M. A.
Bleken (Dept. Hort., POB 5022, N-1432 As, Norway; e-mail:
firstname.lastname@example.org), L.R. Bakken,Ambio, 26(3),
134-142, May 1997.
Uses Norway as an example to analyze the N flows within a society and
the dissipation of N to the environment. Major reductions in the total
consumption of N can be obtained by moderate changes toward a more
vegetarian diet and better utilization of existing food. In contrast,
recycling of waste at its lowest trophic level (compost) is very
inefficient. A critical analysis of the human diet as well as the
agricultural and food industries is necessary to reduce the human
contribution to present and future N2O emissions.
"Nitrous Oxide and Methane Fluxes from Perturbed and Unperturbed
Boreal Forest Sites in Northern Ontario," C.L. Schiller (Dept. Chem.,
York Univ., North York ON M3J 1P3, Can.; e-mail: email@example.com),
D.R. Hastie,J. Geophys. Res., 101(D17), 22,767-22,774,
Oct. 20, 1996.
Measurements in several settings showed N2O fluxes ranging
from an uptake of 7.7 micrograms/m2/hr from a drainage ditch, to an
emission of 3.1 micrograms/m2/hr from an unvegetated clear-cut. Methane
fluxes ranged from an uptake of 23 micrograms/m2/hr from an upland forest,
to an emission of 2900 micrograms/m2/hr from a drainage ditch.
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