DOI: 10.1007/s10533-014-0053-4
Scopus记录号: 2-s2.0-84925486337
论文题名: Late Holocene changes in the humic state of a boreal lake and their associations with organic matter transport and climate dynamics
作者: Rantala M.V. ; Luoto T.P. ; Nevalainen L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 123, 期: 2018-01-02 起始页码: 63
结束页码: 82
语种: 英语
英文关键词: Dystrophy
; Environmental change
; Lake-catchment coupling
; Organic carbon
; Paleolimnology
英文摘要: An important factor in the ontogeny of boreal lakes is the development of their humic state through terrigenous input of organic matter (carbon) that affects strongly the functioning and structure of these ecosystems. The long-term dynamics and role of humic substances for these systems in relation to climate are not clear. In this study, a boreal lake from southern Finland was investigated using paleolimnological methods, including diatom, chironomid and geochemical analyses, for Late Holocene changes in the humic state. The aim was to examine the relationship between sediment biogeochemistry and climate variation. Consistent trends were found in diatom-inferred total lake-water organic carbon (TOC) and in the ratio of humic/oligohumic chironomids. Sediment geochemistry provided further evidence for the limnological development of the lake and related long-term climate trends in the region. The results indicated three distinct phases with differing humic state; the beginning of the record at ca. 4,500 cal year BP was characterized by extremely humic conditions coinciding with warm and dry climatic conditions, a meso-oligohumic period between ca. 3,000–500 cal year BP with increasing allochthonous organic matter transport and cooler and wetter climate, and recent period with polyhumic (TOC >10 mg L−1) lake status and warming climate. This study shows that instead of straightforward linear development, boreal lakes evolve through dynamic humic stages related to climate and lake-catchment coupling processes. As the changes in the humic state are ultimately climate-driven, the ongoing climate change probably has a major influence on boreal lakes through direct and indirect effects on organic carbon transport, utilization and accumulation. © 2014, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83555
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, Helsinki, Finland; Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, Jyväskylä, Finland
Recommended Citation:
Rantala M.V.,Luoto T.P.,Nevalainen L.. Late Holocene changes in the humic state of a boreal lake and their associations with organic matter transport and climate dynamics[J]. Biogeochemistry,2015-01-01,123(2018-01-02)