气候变化领域集成服务门户(CCPortal): Carbon pools and flux of global forest ecosystems

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DOI	10.1126/science.263.5144.185
	Carbon pools and flux of global forest ecosystems
	Dixon R.K.; Brown S.; Houghton R.A.; Solomon A.M.; Trexler M.C.; Wisniewski J.
发表日期	1994
ISSN	0036-8075
起始页码	185
结束页码	190
卷号	263 期号:5144
英文摘要	Forest systems cover more than 4.1 × 109 hectares of the Earth's land area. Globally, forest vegetations and soils contain about 1146 petagrams of carbon, with approximately 37 percent of this carbon in low-latitude forests, 14 percent in mid-latitudes, and 49 percent at high latitudes. Over two-thirds of the carbon in forest ecosystems is contained in soils and associated peat deposits. In 1990, deforestation in the low latitudes emitted 1.6 ± 0.4 petagrams of carbon per year, whereas forest area expansion and growth in mid- and high-latitude forest sequestered 0.7 ± 0.2 petagrams of carbon per year, for a net flux to the atmosphere of 0.9 ± 0.4 petagrams of carbon per year. Slowing deforestation, combined with an increase in forestation and other management measures to improve forest ecosystem productivity, could conserve or sequester significant quantities of carbon. Future forest carbon cycling trends attributable to losses and regrowth associated with global climate and land-use change are uncertain. Model projections and some results suggest that forests could be carbon sinks or sources in the future.Forest systems cover more than 4.1 x 109 hectares of the Earth's land area. Globally, forest vegetation and soils contain about 1146 petagrams of carbon, with approximately 37 percent of this carbon in low-latitude forests, 14 percent in mid-latitudes, and 49 percent at high latitudes. Over two-thirds of the carbon in forest ecosystems is contained in soils and associated peat deposits. In 1990, deforestation in the low latitudes emitted 1.6 ± 0.4 petagrams of carbon per year, whereas forest area expansion and growth in mid- and high-latitude forest sequestered 0.7 ± 0.2 petagrams of carbon per year, for a net flux to the atmosphere of 0.9 ± 0.4 petagrams of carbon per year. Slowing deforestation, combined with an increase in forestation and other management measures to improve forest ecosystem productivity, could conserve or sequester significant quantities of carbon. Future forest carbon cycling trends attributable to losses and regrowth associated with global climate and land-use change are uncertain. Model projections and some results suggest that forests could be carbon sinks or sources in the future.
英文关键词	Atmospheric composition; Carbon dioxide; Climatology; Ecosystems; Environmental impact; Gas emissions; Greenhouse effect; Mass transfer; Carbon cycling trends; Carbon sequestering; Deforestation effects; Forest ecosystem management; Global climate change; Global forest ecosystems; Greenhouse gas emission; Air pollution; article; ecosystem; forest; nonhuman; priority journal; soil; carbon flux; carbon pool; deforestation; forest ecosystem; sequestration
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/243551
作者单位	Global Change Research Program, Environmental Research Laboratory, Environmental Protection Agency, Corvallis, OR 97333, United States; Department of Forestry, University of Illinois, Urbana, IL 61801, United States; Woods Hole Research Center, Woods Hole, MA 02543, United States; Trexler and Associates, Inc., Oak Grove, OR 97267, United States; Wisniewski and Associates, Inc., Falls Church, VA 22043, United States
推荐引用方式 GB/T 7714	Dixon R.K.,Brown S.,Houghton R.A.,et al. Carbon pools and flux of global forest ecosystems[J],1994,263(5144).
APA	Dixon R.K.,Brown S.,Houghton R.A.,Solomon A.M.,Trexler M.C.,&Wisniewski J..(1994).Carbon pools and flux of global forest ecosystems.Science,263(5144).
MLA	Dixon R.K.,et al."Carbon pools and flux of global forest ecosystems".Science 263.5144(1994).