Sensitivity of boreal forest carbon balance to soil thaw

被引:613
作者
Goulden, ML
Wofsy, SC
Harden, JW
Trumbore, SE
Crill, PM
Gower, ST
Fries, T
Daube, BC
Fan, SM
Sutton, DJ
Bazzaz, A
Munger, JW
机构
[1] Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 USA
[2] US Geol Survey, Menlo Park, CA 94025 USA
[3] Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA 92697 USA
[4] Univ New Hampshire, Complex Syst Res Ctr, Durham, NH 03824 USA
[5] Univ Wisconsin, Dept Forest Ecol & Management, Madison, WI 53706 USA
关键词
D O I
10.1126/science.279.5348.214
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
We used eddy covariance; gas-exchange chambers; radiocarbon analysis; wood, moss, and soil inventories; and laboratory incubations to measure the carbon balance of a 120-year-old black spruce forest in Manitoba, Canada. The site lost 0.3 +/- 0.5 metric ton of carbon per hectare per year (ton C ha(-1) year(-1)) from 1994 to 1997, with a gain of 0.6 +/- 0.2 ton C ha(-1) year(-1) in moss and wood offset by a loss of 0.8 +/- 0.5 ton C ha(-1) year(-1) from the soil. The soil remained frozen most of the year, and the decomposition of organic matter in the soil increased 10-fold upon thawing. The stability of the soil carbon pool (similar to 150 tons C ha(-1)) appears sensitive to the depth and duration of thaw, and climatic changes that promote thaw are likely to cause a net efflux of carbon dioxide from the site.
引用
收藏
页码:214 / 217
页数:4
相关论文
共 39 条
[1]  
[Anonymous], 1992, Arctic Ecosystems in a Changing Climate: An Ecophysiological Perspective
[2]  
[Anonymous], [No title captured]
[3]   ARCTIC TUNDRA - A SOURCE OR SINK FOR ATMOSPHERIC CARBON-DIOXIDE IN A CHANGING ENVIRONMENT [J].
BILLINGS, WD ;
LUKEN, JO ;
MORTENSEN, DA ;
PETERSON, KM .
OECOLOGIA, 1982, 53 (01) :7-11
[4]  
Billings WD, 1992, GLOBAL WARMING BIOL, P233
[5]  
BROWN R J E, 1969, P11
[6]  
BUBLER J, UNPUB
[7]  
CHAPMAN WL, 1993, B AM METEOROL SOC, V74, P33, DOI 10.1175/1520-0477(1993)074<0033:RVOSIA>2.0.CO
[8]  
2
[9]  
CLAS P, 1995, SCIENCE, V269, P1098
[10]   MICROBIAL ACTIVITY OF TUNDRA AND TAIGA SOILS AT SUBZERO TEMPERATURES [J].
CLEIN, JS ;
SCHIMEL, JP .
SOIL BIOLOGY & BIOCHEMISTRY, 1995, 27 (09) :1231-1234