Using stable isotopes to determine soil carbon input differences under ambient and elevated atmospheric CO2 conditions

被引：47

作者：

Nitschelm, JJ

Luscher, A

Hartwig, UA

VanKessel, C

机构：

[1] UNIV CALIF DAVIS,DEPT AGRON & RANGE SCI,DAVIS,CA 95616

[2] UNIV SASKATCHEWAN,DEPT SOIL SCI,SASKATOON,SK S7N 5A8,CANADA

[3] SWISS FED INST TECHNOL,INST PLANT SCI,CH-8092 ZURICH,SWITZERLAND

来源：

GLOBAL CHANGE BIOLOGY | 1997年 / 3卷 / 05期

关键词：

elevated CO2; FACE; soil organic carbon; C-13; carbon input; Trifolium repens;

D O I：

10.1046/j.1365-2486.1997.00107.x

中图分类号：

X176 [生物多样性保护];

学科分类号：

090705 ;

摘要：

Quantitative estimates of soil C input under ambient (35 Pa) and elevated (60 Pa) CO2-partial pressure (pCO(2)) were determined in a Free-Air Carbon dioxide Enrichment (FACE) experiment. To facilitate C-13-tracing, Trifolium repens L. was grown in a soil with an initial delta(13)C distinct by at least 5 parts per thousand from the delta(13)C of T. repens grown under ambient or elevated pCO(2). A shift in delta(13)C Of the soil organic C was detected after one growing season. Calculated new soil C inputs in soil under ambient and elevated pCO(2) were 2 and 3 t ha(-1), respectively. Our findings suggest that under elevated CO2 conditions, soil C sequestration may be altered by changes in plant biomass production and quality.

引用

页码：411 / 416

页数：6

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