globalchange  > 气候变化与战略
DOI: 10.1016/j.watres.2020.115648
Diatom-based water-table reconstruction in Sphagnum peatlands of northeastern China
Author: Chen X.; McGowan S.; Bu Z.-J.; Yang X.-D.; Cao Y.-M.; Bai X.; Zeng L.-H.; Liang J.; Qiao Q.-L.
Source Publication: Water Research
ISSN: 431354
Publishing Year: 2020
Volume: 174
Language: 英语
Keyword: Diatom analysis ; Hydrological change ; Northeastern China ; Peat sediment ; Transfer function
Scopus Keyword: Biodiversity ; Climate change ; Conservation ; Digital storage ; Discrete wavelet transforms ; Ecosystems ; Groundwater ; Peat ; Phytoplankton ; Signal reconstruction ; Statistical methods ; Transfer functions ; Biodiversity conservation ; Climate variability ; Diatom analysis ; Environmental factors ; Hydrological changes ; Leave-one-out cross validations ; Northeastern China ; Palaeoenvironmental reconstruction ; Wetlands ; biodiversity ; bioindicator ; diatom ; global perspective ; hydrological change ; ordination ; peat soil ; peatland ; sediment chemistry ; transfer function ; water table ; Aershan ; China ; Nei Monggol ; Bacillariophyta ; Eunotia ; Sphagnum
English Abstract: Peatlands are important ecosystems for biodiversity conservation, global carbon cycling and water storage. Hydrological changes due to climate variability have accelerated the degradation of global and regional ecosystem services of peatlands. Diatoms are important producers and bioindicators in wetlands, but comprehensive diatom-based inference models for palaeoenvironmental reconstruction in peatlands are scarce. To explore the use of diatoms for investigating peatland hydrological change, this study established a training set consisting of diatom composition and twelve environmental factors from 105 surface samples collected from five Sphagnum peatlands in northeastern China. Diatom communities were dominated by Eunotia species. Ordination analyses showed that depth to the water table (DWT) was the most important factor influencing diatom distribution, independently accounting for 4.99% of total variance in diatom data. Accordingly, a diatom-based DWT transfer function was developed and thoroughly tested. The results revealed that the best-performing model was based on weighted averaging with inverse deshrinking (R2 = 0.66, RMSEP = 8.8 cm with leave-one-out cross validation). Quantitative reconstruction of DWT on a short peat core collected from the Aershan Peatland (Inner Mongolia) recorded climate-mediated hydrological changes over the last two centuries. This study presents the first diatom-water table transfer function in Sphagnum peatlands, and highlights the potential of diatoms as a powerful tool to assess the magnitude of past hydrological changes in peatlands of northeastern China, as well as similar peaty environments worldwide. © 2020 Elsevier Ltd
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Document Type: 期刊论文
Appears in Collections:气候变化与战略

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Affiliation: Hubei Key Laboratory of Critical Zone Evolution, School of Geography and Information Engineering, China University of Geosciences, Wuhan, 430074, China; School of Geography, University of Nottingham, Nottingham, NG7 2RD, United Kingdom; Institute for Peat and Mire Research, State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Northeast Normal University, Changchun, 130024, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China; College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan, 430074, China

Recommended Citation:
Chen X.,McGowan S.,Bu Z.-J.,et al. Diatom-based water-table reconstruction in Sphagnum peatlands of northeastern China[J]. Water Research,2020-01-01,174
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