Variations in active layer soil hydrothermal dynamics of typical wetlands in permafrost region in the Great Hing’an Mountains, northeast China

Dong, Xingfeng; Liu, Chao; Li, Miao; Ma, Dalong; Chen, Qiang; Zang, Shuying

doi:10.1016/j.ecolind.2021.107880

Cited by 23 publications

(9 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The study area (Supplementary Figure 1) was located in the continuous permafrost region of the northern slope of the Great Hing'an Mountains, Heilongjiang Province, China (53 • 28 N, 122 • 20 E). This area is in the cold temperate climate zone, with a mean annual temperature of −2.19 • C, and a mean annual precipitation of 549.9 mm, about two-thirds of which falls between June and August (Dong et al, 2021). Forests and wetlands are widespread in this region.…”

Section: Site Description and Samplingmentioning

confidence: 99%

Organic Carbon Mineralization and Bacterial Community of Active Layer Soils Response to Short-Term Warming in the Great Hing’an Mountains of Northeast China

Dong

Liu

et al. 2021

Front. Microbiol.

Self Cite

View full text Add to dashboard Cite

As a buffer layer for the energy and water exchange between atmosphere and permafrost, the active layer is sensitive to climate warming. Changes in the thermal state in active layer can alter soil organic carbon (SOC) dynamics. It is critical to identify the response of soil microbial communities to warming to better predict the regional carbon cycle under the background of global warming. Here, the active layer soils collected from a wetland-forest ecotone in the continuous permafrost region of Northeastern China were incubated at 5 and 15°C for 45 days. High-throughput sequencing of the 16S rRNA gene was used to examine the response of bacterial community structure to experimental warming. A total of 4148 OTUs were identified, which followed the order 15°C > 5°C > pre-incubated. Incubation temperature, soil layer and their interaction have significant effects on bacterial alpha diversity (Chao index). Bacterial communities under different temperature were clearly distinguished. Chloroflexi, Actinobacteria, Proteobacteria, and Acidobacteria accounted for more than 80% of the community abundance at the phylum level. Warming decreased the relative abundance of Chloroflexi and Acidobacteria, while Actinobacteria and Proteobacteria exhibited increasing trend. At family level, the abundance of norank_o__norank_c__AD3 and Ktedonobacteraceae decreased significantly with the increase of temperature, while Micrococcaccac increased. In addition, the amount of SOC mineralization were positively correlated with the relative abundances of most bacterial phyla and SOC content. SOC content was positively correlated with the relative abundance of most bacterial phyla. Results indicate that the SOC content was the primary explanatory variable and driver of microbial regulation for SOC mineralization. Our results provide a new perspective for understanding the microbial mechanisms that accelerates SOC decomposition under warming conditions in the forest-wetland ecotone of permafrost region.

show abstract

Section: Site Description and Samplingmentioning

confidence: 99%

Organic Carbon Mineralization and Bacterial Community of Active Layer Soils Response to Short-Term Warming in the Great Hing’an Mountains of Northeast China

Dong

Liu

et al. 2021

Front. Microbiol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…This study was performed in a permafrost-affected forest–wetland ecotone in Beiji town, Daxing’an Mountains, Northeast China ( Figure 1 ). The area experiences a typical cold temperate continental monsoon climate with an annual mean air temperature and precipitation of −2.19 °C and 549.9 mm, respectively [ 26 ]. The depth of the active layer is approximately 90–100 cm and 125–135 cm in wetland and forest patches, respectively, and measurements of the active layer were taken manually using a stainless steel drill in September 2020.…”

Section: Methodsmentioning

confidence: 99%

“…The depth of the active layer is approximately 90–100 cm and 125–135 cm in wetland and forest patches, respectively, and measurements of the active layer were taken manually using a stainless steel drill in September 2020. The multiple diurnal FTCs begin in early May, and the spring FTC period lasts approximately two weeks; the autumn FTC period lasts approximately a week in mid-October [ 26 ]. The dominant species of the forest patches are Larix gmelina Ruprecht, Ledum palustre Linn., Betula ovalifolia Ruprecht, and Vaccinium uliginosum Linn., and Eriophorum vaginatum Linn.…”

Section: Methodsmentioning

confidence: 99%

“…The two FTC amplitudes were −5–5 °C and −10–10 °C, respectively [ 33 ]. After preincubation (CK) and the 1st [ 32 , 33 ], 3rd (close to the shortest FTC duration of 10 cm soil depth, 5 days), and 9th FTCs (close to the longest FTC duration of 10 cm soil depth, 17 days) [ 26 ], 10 mL gas samples were collected with a syringe with a three-way valve, and were analyzed using a gas chromatograph (Agilent 7890B, USA) ( Table 1 ). Emission rates of CO 2 and CH 4 were calculated according to Lang et al [ 34 ].…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Response of Carbon Emissions and the Bacterial Community to Freeze–Thaw Cycles in a Permafrost-Affected Forest–Wetland Ecotone in Northeast China

Liu

Dong

et al. 2022

Microorganisms

View full text Add to dashboard Cite

Climate warming can affect freeze–thaw cycle (FTCs) patterns in northern high-latitude regions and may affect permafrost carbon emissions. The response of carbon release and microbial communities to FTCs has not been well characterized. Here, we conducted laboratory incubation experiments to investigate the relationships among carbon emissions, bacterial community, and soil variables in a permafrost-affected forest–wetland ecotone in Northeast China. The emission rates of CO2 and CH4 increased during the FTCs. FTC amplitude, FTC frequency, and patch type had significant effects on carbon emissions. FTCs increased the contents of soil DOC, NH4+-N, and NO3--N but reduced bacterial alpha diversity. CO2 emissions were mainly affected by bacterial alpha diversity and composition, and the inorganic nitrogen content was the important factor affecting CH4 emissions. Our findings indicated that FTCs could significantly regulate CO2 and CH4 emissions by reducing bacterial community diversity and increasing the concentration of available soil substrates. Our findings shed new light on the microorganism-substrate mechanisms regulating the response patterns of the soil carbon cycle to FTCs in permafrost regions.

show abstract

“…According to the summer thawing process of the active layer, the thawing process of the active layer is a one-way process, the heat transfer direction of the active layer moves from top to bottom, and the thawing front gradually migrates downward and gradually reaches the maximum thawing depth [38][39][40]. Therefore, the time taken to reach the maximum thawing depth is greatly affected by the ALT.…”

Section: Spatial Heterogeneity Of Time Of Maximum Thawing Depthmentioning

confidence: 99%

Monitoring Regional-Scale Surface Deformation of the Continuous Permafrost in the Qinghai–Tibet Plateau with Time-Series InSAR Analysis

Jiang

Niu

et al. 2022

Remote Sensing

View full text Add to dashboard Cite

As an important indicator of permafrost degradation, surface deformation is often used to monitor the thawing and freezing process in the permafrost active layer. However, due to the large area of the continuous permafrost of the Qinghai–Tibet Plateau (QTP) and the large amount of data processed by conventional time-series InSAR, previous studies have mostly focused on local area investigations, and regional characteristics of surface deformation of the continuous permafrost area on the QTP are still unclear. In this paper, we characterized surface deformation in space and time over the main continuous permafrost area on the QTP, by analyzing 11 ascending and 8 descending orbits of Sentinel-1 SAR data acquired between 2018 and 2021 with the time-series InSAR processing system LiCSAR. The reliability of the InSAR deformation results was verified by a combination of leveling measurement data, the intercomparison of overlapping area results, and field verification. The results show that the permafrost regions of the central QTP exhibited the most significant linear subsidence trend. The subsidence trend of permafrost on the QTP was mainly related to the thermal stability of permafrost, and the regions with larger subsidence rates were concentrated in sub-stable, transitional and unstable permafrost areas. We also found that, according to analysis of time-series displacement, the beginning and ending times of permafrost thawing were highly spatially heterogeneous, with the time of maximum thawing depth varying between mid-October and mid-November, which was probably attributed to the active layer thickness (ALT), water content in the active layer, and vegetation cover in these regions. This study is of great significance for understanding the changing trend of permafrost on the QTP under the background of climate change. In addition, this study also demonstrates that combination of Sentinel-1 SAR images with the LiCSAR system has significant potential for detecting permafrost deformation with high accuracy and high efficiency at regional and global scales.

show abstract

Variations in active layer soil hydrothermal dynamics of typical wetlands in permafrost region in the Great Hing’an Mountains, northeast China

Cited by 23 publications

References 50 publications

Organic Carbon Mineralization and Bacterial Community of Active Layer Soils Response to Short-Term Warming in the Great Hing’an Mountains of Northeast China

Organic Carbon Mineralization and Bacterial Community of Active Layer Soils Response to Short-Term Warming in the Great Hing’an Mountains of Northeast China

Response of Carbon Emissions and the Bacterial Community to Freeze–Thaw Cycles in a Permafrost-Affected Forest–Wetland Ecotone in Northeast China

Monitoring Regional-Scale Surface Deformation of the Continuous Permafrost in the Qinghai–Tibet Plateau with Time-Series InSAR Analysis

Contact Info

Product

Resources

About