DOI: 10.1016/j.earscirev.2020.103277
论文题名: Biomarkers as a soil organic carbon tracer of sediment: Recent advances and challenges
作者: Li Z. ; Sun Y. ; Nie X.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 208 语种: 英语
中文关键词: Fingerprint index
; Lipid biomarker
; Sediment
; Soil organic carbon
; Tracer approach
; Uncertain factor
英文关键词: biomarker
; lipid
; organic carbon
; sediment
; soil erosion
; soil organic matter
; spatial variation
; temporal variation
; tracer
英文摘要: Soil organic carbon (SOC) tracing can provide important information for effective and accurate management of soil erosion. However, tracing erosion-induced SOC is still challenging, due to a spatiotemporal variability of SOC and diversity of its sources. Selection of effective tracers is a vital way in coping with these challenges. Biomarkers, which present tight correlationships with soil and vegetation, and characterized with source-specific, have been considered to be a promising tracer in tracing SOC, despite specialized analytical instruments are also required for biomarker analysis. Even so, there are still uncertain factors in tracing SOC, that is, instability factors that affect the strength of biomarker signal. A fully understanding of the generation, transport, and conservative behavior of biomarkers is beneficial to better application. In this review, several representative lipid biomarkers were compared to identify different sediment/soil organic matter sources. Additionally, the general sediment/soil tracing mechanism and the transport mechanism of the biomarker are described clearly. Furthermore, the potential of biomarkers in assessing the contributions of organic carbon sources was demonstrated through correlation application analysis. Nevertheless, challenges remain because of the potentially high degrees of environmental and analytical uncertainty. The eroded soil source contributions to sediment cannot be obtained accurately by using biomarkers alone, according to uncertainty analysis. Hence, a combination with other fingerprint indices, such as spectroscopic indices or stable isotopes, is highly recommended for accurate tracing of soil organic carbon sources. Future research directions include (1) understanding the conservative behavior of tracer biomarkers in the processes of source separation, transportation, and deposition and (2) verifying the source assignment accuracy of biomarkers by field/laboratory testing or model fitting. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166153
Appears in Collections: 气候变化与战略
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作者单位: College of Resources and Environmental Sciences, Hunan Normal University, Changsha, 410081, China; College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
Recommended Citation:
Li Z.,Sun Y.,Nie X.. Biomarkers as a soil organic carbon tracer of sediment: Recent advances and challenges[J]. Earth Science Reviews,2020-01-01,208