Arid
DOI10.1007/s11104-017-3233-x
Depth profiles of soil carbon isotopes along a semi-arid grassland transect in northern China
Wang, Chao1; Wei, Haiwei1,2; Liu, Dongwei1; Luo, Wentao1; Hou, Jianfeng1,2; Cheng, Weixin1,3; Han, Xingguo1; Bai, Edith1
通讯作者Bai, Edith
来源期刊PLANT AND SOIL
ISSN0032-079X
EISSN1573-5036
出版年2017
卷号417期号:1-2页码:43-52
英文摘要

Soil is an important organic carbon (C) pool in terrestrial ecosystems, but knowledge on soil organic carbon (SOC) decomposition rate and influencing factors remains limited, particularly in arid and semi-arid grasslands. Models show that global semi-arid regions are experiencing more extreme climate events, which may trigger more C loss from soils.


We used the stable carbon isotope (delta C-13) of plant and soil depth profile to examine decomposition rates of SOC along a 2200 km semi-arid grassland transect in northern China. Beta (beta) was calculated from the relationship between delta C-13 and C concentrations of plant and soil profile (0-100 cm). Partial correlation analysis and structure equation models were used to analyze correlations between beta and climatic and edaphic variables.


We found that the delta C-13 values increased from plant tissues to surface soil and then deep soil at all sites, while the SOC concentration decreased. The beta values ranged from -0.33 to -2.27, with an average value at -1.37. There was a positive correlation between beta value and SOC decomposition rate constant (k), supporting the hypothesis that enrichment of delta C-13 along soil depth profile was mainly due to isotopic fractionation during microbial SOC decomposition. The correlation between beta value and aridity index was mainly due to the variations of edaphic properties such as soil C/N ratio with aridity index, pointing to the more important role of edaphic properties in beta value than climatic factors.


Despite uncertainties associated with the interpretation of soil delta C-13 along its depth profile, our results demonstrated that soil delta C-13 could provide an independent benchmark for examining model-based predictions of SOC decomposition in semi-arid grasslands. Incorporation of both climatic and edaphic variables into models may enhance the predictions for SOC dynamics under global climate changes.


英文关键词Soil organic carbon Turnover rate Beta value Carbon decomposition Aridity index Grasslands Climate change models
类型Article
语种英语
国家Peoples R China ; USA
收录类别SCI-E
WOS记录号WOS:000407750900003
WOS关键词ORGANIC-CARBON ; TURNOVER TIMES ; C-13 ENRICHMENT ; DECOMPOSITION ; CLIMATE ; DELTA-C-13 ; SEQUESTRATION ; FRACTIONATION ; PATTERNS ; RATIOS
WOS类目Agronomy ; Plant Sciences ; Soil Science
WOS研究方向Agriculture ; Plant Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/201505
作者单位1.Chinese Acad Sci, Inst Appl Ecol, CAS Key Lab Forest Ecol & Management, Shenyang 110164, Liaoning, Peoples R China;
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China;
3.Univ Calif Santa Cruz, Dept Environm Studies, 1156 High St, Santa Cruz, CA 95064 USA
推荐引用方式
GB/T 7714
Wang, Chao,Wei, Haiwei,Liu, Dongwei,et al. Depth profiles of soil carbon isotopes along a semi-arid grassland transect in northern China[J],2017,417(1-2):43-52.
APA Wang, Chao.,Wei, Haiwei.,Liu, Dongwei.,Luo, Wentao.,Hou, Jianfeng.,...&Bai, Edith.(2017).Depth profiles of soil carbon isotopes along a semi-arid grassland transect in northern China.PLANT AND SOIL,417(1-2),43-52.
MLA Wang, Chao,et al."Depth profiles of soil carbon isotopes along a semi-arid grassland transect in northern China".PLANT AND SOIL 417.1-2(2017):43-52.
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