Geocryology in China

Zhang, Tingjun; Youwu, Zhou; Guo, De‐An; Qiu, Guibao; Guodong, Cheng; Shude, Li

doi:10.2307/1552227

Cited by 23 publications

(4 citation statements)

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“…The principles and methods of the map compilation have been reported by . Zhang (2001) provided a detailed review on the book by Zhou et al (2000), with a main focus on the included map.…”

Section: Map Of Permafrost On the Qinghai-tibetan Plateaumentioning

confidence: 99%

Distribution of Permafrost in China: An Overview of Existing Permafrost Maps

Ran

Cheng

et al. 2012

Permafrost & Periglacial

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233

124

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Many permafrost maps in China have been compiled since the early 1960s. The scales of these maps range from the local (1:600 000) to the regional scale (1:10 000 000). The permafrost classification systems differ among these maps. The indices for permafrost classification used in these mapping projects include spatial continuity (areal extent) and thickness of the permafrost, air and ground temperatures and ground ‐ice content. All of those data have been retrieved, digitised and published in the Environmental and Ecological Science Data Center for West China. These maps represent the best understanding at the time regarding the distribution of permafrost in China and its changes over the past century. An updated map of permafrost in China, including frozen ground area, is also provided. The total area of permafrost in China is estimated at ~ 1.59 × 106 km2 (glaciers and lakes excluded), and the area of seasonally frozen ground (excluding instantaneous frozen ground) is ~ 5.36 × 106 km2. The total area of high‐altitude (plateau and mountain) permafrost in China is ~ 1.35 × 106 km2, the area of mountain permafrost is ~ 0.30 × 106 km2 and the area of plateau permafrost is ~ 1.05 × 106 km2. The latitudinal permafrost is located in the northern part of northeastern China, and its area is ~ 0.24 × 106 km2. Additionally, some suggestions are proposed for future mapping of permafrost in China. Copyright © 2012 John Wiley & Sons, Ltd.

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“…The principles and methods of the map compilation have been reported by . Zhang (2001) provided a detailed review on the book by Zhou et al (2000), with a main focus on the included map.…”

Section: Map Of Permafrost On the Qinghai-tibetan Plateaumentioning

confidence: 99%

Distribution of Permafrost in China: An Overview of Existing Permafrost Maps

Ran

Cheng

et al. 2012

Permafrost & Periglacial

Self Cite

233

124

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“…Located on the southeastern edges of the Eurasian cryolithozone, the permafrost in northeastern China, known as the main high-latitude cold area and the second largest expanse of permafrost in China, is thermally unstable and ecologically sensitive to climatic change 23 . There exist an obvious distribution pattern of latitudinal permafrost 24 . With latitude decreases, the mean annual ground surface temperature and the thickness of the active layer increases.…”

Section: Introductionmentioning

confidence: 99%

Soil pH and plant diversity shape soil bacterial community structure in the active layer across the latitudinal gradients in continuous permafrost region of Northeastern China

Ren

Chen

et al. 2018

Sci Rep

101

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In the permafrost region of northeastern China, vegetation and soil environment have showed response to permafrost degradation triggered by global warming, but the corresponding variation of the soil microbial communities remains poorly investigated. Here, a field investigation in the continuous permafrost region was conducted to collect 63 soil samples from 21 sites along a latitudinal gradient to assess the distribution pattern of microbial communities and their correlation with environmental factors. High-throughput Illumina sequencing revealed that bacterial communities were dominated by Proteobacteria, Acidobacteria, Bacteroidetes and Actinobacteria. Both microbial richness and phylogenetic diversity decreased initially and then increased as the latitude increased. UniFrac analysis of microbial communities detected significant differences among latitudes. Variation partitioning analysis and structural equation models revealed that environmental variables, including geographic factors, plant-community factors and soil physicochemical factors, all played non-negligible roles in affecting the microbial community structures directly or indirectly. Redundancy analysis and boosted regression tree analysis further highlighted the influences of soil pH and plant richness on microbial community compositions and diversity patterns. Taken together, these results suggest that the distribution pattern of soil microbial communities shows distinct changes along the latitudinal gradients in northeastern China and is predominantly mediated by soil pH and plant diversity.

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“…Permafrost areas account for 22.4 percent of the land area of China, mainly distributed in the Qinghai-Tibet Plateau (QTP) and northeast China [1]. With the accelerating process of western development, Tibet and Qinghai Province have a great expectation of economic development in the Fourteenth Five-Year Plan.…”

Section: Introductionmentioning

confidence: 99%

Bridge’s Overall Structural Scheme Analysis in High Seismic Risk Permafrost Regions

Xiong

Chen²,

Liu³

et al. 2022

Civ Eng J

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The mechanism of pile-soil reaction in frozen ground is not clear at present, but it is obvious that the reduction of dead weight will be beneficial to the seismic resistance of bridges. In view of the limited bridge engineering practice in high seismic risk permafrost regions, the paper addressed the structural performance of the superstructure and its effect on piles in these special regions. Four superstructures with different dead weights were compared, and bored piles were designed. Numerical simulations were implemented to investigate the refreezing time of the bored pile foundation. The concrete pile cooled rapidly in the first two days. The refreezing times of the GFRP, prestressed concrete T-girder, integrated composite girder, and MVFT girder were 15d, 37d, 39d, and 179d, respectively. The refreezing time of a pile in the same soil layer is mainly affected by the pile’s diameter, and it is significantly correlated to the square of the pile diameter. It reflects that the selection of bridge superstructures in the permafrost region is very important, which has been ignored in previous studies. The pile length and pile diameter of the lighter superstructure can be shorter and smaller to reduce the refreezing time and alleviate the thermal disturbance. Doi: 10.28991/CEJ-2022-08-07-01 Full Text: PDF

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Geocryology in China

Cited by 23 publications

References 0 publications

Distribution of Permafrost in China: An Overview of Existing Permafrost Maps

Distribution of Permafrost in China: An Overview of Existing Permafrost Maps

Soil pH and plant diversity shape soil bacterial community structure in the active layer across the latitudinal gradients in continuous permafrost region of Northeastern China

Bridge’s Overall Structural Scheme Analysis in High Seismic Risk Permafrost Regions

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