Radiocarbon constraints imply reduced carbon uptake by soils during the 21st century

被引：156

作者：

He, Yujie ^{[1
]}

Trumbore, Susan E. ^{[2
]}

Torn, Margaret S. ^{[3
]}

Harden, Jennifer W. ^{[4
,5
]}

Vaughn, Lydia J. S. ^{[3
]}

Allison, Steven D. ^{[1
,6
]}

Randerson, James T. ^{[1
]}

机构：

[1] Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA USA

[2] Max Planck Inst Biogeochem, Dept Biogeochem Proc, Jena, Germany

[3] Lawrence Berkeley Natl Lab, Earth Sci Div, Berkeley, CA USA

[4] US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA

[5] Stanford Univ, Stanford, CA 94305 USA

[6] Univ Calif Irvine, Dept Ecol & Evolutionary Biol, Irvine, CA 92717 USA

来源：

SCIENCE | 2016年 / 353卷 / 6306期

关键词：

EARTH SYSTEM MODELS; ORGANIC-MATTER; TURNOVER TIMES; CLIMATE; STORAGE; UNCERTAINTY; DYNAMICS; FOREST; CMIP5; CHRONOSEQUENCE;

D O I：

10.1126/science.aad4273

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：

Soil is the largest terrestrial carbon reservoir and may influence the sign and magnitude of carbon cycle-climate feedbacks. Many Earth system models (ESMs) estimate a significant soil carbon sink by 2100, yet the underlying carbon dynamics determining this response have not been systematically tested against observations. We used C-14 data from 157 globally distributed soil profiles sampled to 1-meter depth to show that ESMs underestimated the mean age of soil carbon by a factor of more than six (430 +/- 50 years versus 3100 +/- 1800 years). Consequently, ESMs overestimated the carbon sequestration potential of soils by a factor of nearly two (40 +/- 27%). These inconsistencies suggest that ESMs must better represent carbon stabilization processes and the turnover time of slow and passive reservoirs when simulating future atmospheric carbon dioxide dynamics.

引用

页码：1419 / 1424

页数：6

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