Diatom distribution in an alpine basin (central China) in relation to environmental factors and substrata

Chen, Xu; Stevenson, Mark A.; Zeng, Linghan; Qiao, Qianglong

doi:10.1080/0269249x.2017.1371082

Cited by 6 publications

(2 citation statements)

References 45 publications

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“…Olofsson et al, 2019). A significant relationship between NH 4 + concentration and diatom composition was found in peatlands of this study, as well as other similar peaty environments (Chen et al, 2017; Ma et al, 2018). In addition, DOC was a significant variable for diatom distribution, since it could influence light availability in wet hollows and might be also important for nutrition of submerged autotrophic algae (Jiroušek et al, 2013).…”

Section: Discussionsupporting

confidence: 86%

Diatom‐inferred microtopography formation in peatlands

Chen

McGowan

et al. 2021

Earth Surf Processes Landf

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Peatlands, an important carbon pool in terrestrial ecosystems, are often characterised by a hummock-hollow microtopography, which has important implications for hydrologic conditions, biotic community structure and carbon cycling. However, dynamics of microtopography formation are poorly understood. Moss-inhabiting diatoms are sensitive to water table change and may be used to infer microtopography formation.Sixty-three surface moss samples were collected from four Sphagnum peatlands in the Changbai Mountains (north-eastern China), covering a water table gradient of 0-55 cm. Ordination analyses revealed that depth to the water table (DWT) was the determinant of diatom distribution, and its sole effect explained 15% of total variance in diatom composition. Accordingly, a diatom-based water table transfer function was developed using a weighted averaging model with inverse deshrinking (R 2 = 0.82, RMSEP = 5.63 cm with leave-one-out cross validation), and applied to diatom records of a Sphagnum hummock profile. Quantitative reconstruction of

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Section: Discussionsupporting

confidence: 86%

Diatom‐inferred microtopography formation in peatlands

Chen

McGowan

et al. 2021

Earth Surf Processes Landf

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“…It can be expected that climate warming will enhance peat decomposition and increase nutrient availability (Bragazza et al, 2013; Laiho, 2006), while rainfall variability can alter moisture conditions (Chen et al, 2020; Li et al, 2020). In these subtropical montane peatlands, diverse diatom species have been found in surface samples (Chen et al, 2017). Diatoms are ecological specialists, sorting along gradients of water table, pH and cation content (Battarbee et al, 2001; Gaiser and Rühland, 2010).…”

Section: Introductionmentioning

confidence: 99%

Effects of climate change on a subtropical montane peatland over the last two centuries: Evidence from diatom records

et al. 2021

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Climate variability can induce rapid changes in peatland ecosystems, affecting both carbon cycling and vegetation succession. Diatoms are an important group of ubiquitous and diverse algae in peatlands. Until now, the responses of diatom communities to climate variability have rarely been explored in peatlands, especially in subtropical regions. In this study, monitoring and paleolimnological datasets were combined to decipher environmental changes of a subtropical montane peatland (central China) over the last two centuries. Seasonal monitoring data revealed that diatom communities were closely correlated with precipitation, depth to the water table, conductivity, nitrate and temperature. Sedimentary records revealed that temporal changes in diatom assemblages and geochemical elements displayed similar trends in two peat cores after the 1950s. The first gradient in diatom composition represented a shift from Pinnularia species to taxa preferring less-acidic habitats, which was closely linked to climate warming and the enrichment of inorganic elements (e.g. sodium and calcium) since the early 20th century. Meanwhile, changes in diatom communities were further related to precipitation variability, atmospheric deposition and local hydrogeomophic setting. Taken together, the succession of diatom communities was closely linked to climate-regulated availability of nutrients and moisture in this subtropical peatland over the last two centuries. In order to achieve sustainable management of these scarce peatlands, further biological monitoring and paleoecological studies are needed to improve our knowledge of peatland ecosystem evolution in response to future climate change.

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