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Cairns Michael A. Winjum Jack K. Phillips Donald L. Kolchugina Tatyana P. Vinson Ted S. 《Mitigation and Adaptation Strategies for Global Change》1997,1(4):363-383
This research assessed land-use impacts on C flux at a national level in four countries: former Soviet Union, United States,
Mexico and Brazil, including biotic processes in terrestrial ecosystems (closed forests, woodlands, and croplands), harvest
of trees for wood and paper products, and direct C emission from fires. The terrestrial ecosystems of the four countries contain
approximately 40% of the world's terrestrial biosphere C pool, with the FSU alone having 27% of the global total. Average
phytomass C densities decreased from south to north while average soil C densities in all three vegetation types generally
increased from south to north. The C flux from land cover conversion was divided into a biotic component and a land-use component.
We estimate that the total net biotic flux (Tg/yr) was positive (= uptake) in the FSU (631) and the U.S. (332), but negative
in Mexico (−37) and Brazil (−16). In contrast, total flux from land use was negative (= emissions) in all four countries (TgC/yr):
FSU −343; U.S. −243; Mexico −35; and Brazil −235. The total net effect of the biotic and land-use factors was a C sink in
the FSU and the U.S. and a C source in both Brazil and Mexico.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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