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The global cycle of nitrogen has been altered by human activity to
a greater extent than that of any other element. The production of
nitrogen fertilizer, cultivation of legumes, and incidental
nitrogen fixation in internal combustion engines together transfer
more nitrogen from the atmosphere into biologically available forms
than is fixed by all natural processes combined. Additionally,
biomass burning and land-use change mobilize large quantities of
recalcitrant nitrogen into dynamic forms. Although the global
change in nitrogen cycling is immense, reactive and biologically
available forms of nitrogen do not truly cycle globally. Rather,
their transport is over distances of tens to many hundreds of
kilometers. Consequently, the alteration of the global nitrogen
cycle is manifested as changes at the scale of large regions. Thus,
since 1994 the International SCOPE Nitrogen Project has held a
series of workshops focused upon nitrogen dynamics in several
different regions of the globe. In May 1996, the Andrew Mellon
Foundation and the Inter-American Institute for Global Change (IAI)
co-sponsored a SCOPE-N workshop in Termas de Chillan, Chile,
entitled A Comparative Analysis of Nitrogen Cycling in the
Temperate and Tropical Americas. More than 40 scientists from 12
different countries met with two principal goals: 1) to compare
nitrogen cycling in the relatively pristine temperate zone of South
America with the generally more polluted zone of North America; and
2) to compare both with nitrogen cycling in the tropical regions of
Latin America. This volume presents 12 manuscripts which summarize
their efforts during and after the meeting; these papers are rich
in new insights and theory. Their conclusions not only advance our
understanding of nitrogen dynamics in the Americas, but also of how
the global nitrogen cycle responds to the pronounced and continued
effects of human activity."
The global cycle of nitrogen has been altered by human activity to
a greater extent than that of any other element. The production of
nitrogen fertilizer, cultivation of legumes, and incidental
nitrogen fixation in internal combustion engines together transfer
more nitrogen from the atmosphere into biologically available forms
than is fixed by all natural processes combined. Additionally,
biomass burning and land-use change mobilize large quantities of
recalcitrant nitrogen into dynamic forms. Although the global
change in nitrogen cycling is immense, reactive and biologically
available forms of nitrogen do not truly cycle globally. Rather,
their transport is over distances of tens to many hundreds of
kilometers. Consequently, the alteration of the global nitrogen
cycle is manifested as changes at the scale of large regions. Thus,
since 1994 the International SCOPE Nitrogen Project has held a
series of workshops focused upon nitrogen dynamics in several
different regions of the globe. In May 1996, the Andrew Mellon
Foundation and the Inter-American Institute for Global Change (IAI)
co-sponsored a SCOPE-N workshop in Termas de Chillan, Chile,
entitled A Comparative Analysis of Nitrogen Cycling in the
Temperate and Tropical Americas. More than 40 scientists from 12
different countries met with two principal goals: 1) to compare
nitrogen cycling in the relatively pristine temperate zone of South
America with the generally more polluted zone of North America; and
2) to compare both with nitrogen cycling in the tropical regions of
Latin America. This volume presents 12 manuscripts which summarize
their efforts during and after the meeting; these papers are rich
in new insights and theory. Their conclusions not only advance our
understanding of nitrogen dynamics in the Americas, but also of how
the global nitrogen cycle responds to the pronounced and continued
effects of human activity."
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