Mineral magnetism variables as potential indicators of permafrost aggradation and degradation at the southern edge of the permafrost zone, Northeast China

Boreas ◽  
2021 ◽  
Author(s):  
Chenyi Zhu ◽  
Hongya Wang ◽  
Shuai Li ◽  
Yao Luo ◽  
Tianyi Xue ◽  
...  
Keyword(s):  
Northeast China ◽  
Permafrost Zone ◽  
Mineral Magnetism

Annual Carbon Gas Emissions from a Boreal Peatland in Continuous Permafrost Zone, Northeast China

2016 ◽  
Vol 44 (5) ◽  
pp. 456-463 ◽  
Author(s):  
Yuqing Miao ◽  
Changchun Song ◽  
Xianwei Wang ◽  
Henan Meng ◽  
Li Sun ◽  
...  
Keyword(s):  
Northeast China ◽  
Permafrost Zone ◽  
Gas Emissions ◽  
Continuous Permafrost ◽  
Annual Carbon

scholarly journals Seasonal methane emission from a boreal peatland in continuous permafrost zone of Northeast China: effects of active layer depth and vegetation

2012 ◽  
Vol 9 (6) ◽  
pp. 6751-6775
Author(s):  
Y. Miao ◽  
C. Song ◽  
L. Sun ◽  
X. Wang ◽  
H. Meng ◽  
...  
Keyword(s):  
Pore Water ◽  
Water Table ◽  
Active Layer ◽  
Northeast China ◽  
Abiotic Factors ◽  
Permafrost Zone ◽  
Layer Depth ◽  
Ch4 Emissions ◽  
Boreal Peatlands ◽  
Continuous Permafrost

Abstract. Boreal peatlands are significant natural sources of methane and especially vulnerable to abrupt climate change. However, the controlling factors of CH4 emission in boreal peatlands are still unclear. In this study, we investigated CH4 fluxes and abiotic factors (temperature, water table depth, active layer depth, and dissolved CH4 concentrations in pore water) during the growing seasons in 2010 and 2011 both in shrub-sphagnum- and sedge-dominated plant communities in continuous permafrost zone of Northeast China. The objective of our study was to examine the effects of vegetation types and abiotic factors on CH4 fluxes from a boreal peatland. In Eriophorum-dominated community, mean CH4 emissions were 1.015 and 0.801 mg m−2 h−1 in 2010 and 2011, respectively. CH4 fluxes (0.384 mg m−2 h−1) released from the shrub-mosses-dominated community were lower than that from Eriophorum-dominated community. Moreover, in Eriophorum-dominated community, CH4 fluxes showed a significant temporal pattern with a peak value in late August both in 2010 and 2011. However, no distinct seasonal variation was observed in the CH4 flux in the shrub-mosses-dominated community. Interestingly, both in Eriophorum- and shrub-sphagnum-dominated communities, CH4 fluxes did not show close correlation with air or soil temperature and water table depth, whereas CH4 emissions correlated well to active layer depth and CH4 concentration in soil pore water, especially in Eriophorum-dominated community. Our results suggest that CH4 released from the thawed CH4-rich permafrost layer may be a key factor controlling CH4 emissions in boreal peatlands, and highlight that CH4 fluxes vary with vegetation type in boreal peatlands.

Assessment of viral assemblages in different types of wetland water in northeast China using RAPD-PCR

2020 ◽  
Vol 85 ◽  
pp. 183-196
Author(s):  
Y Sun ◽  
J Liu ◽  
Q Yao ◽  
J Jin ◽  
X Liu ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Water Samples ◽  
Northeast China ◽  
Bacterial Community Composition ◽  
Freshwater Wetlands ◽  
Viral Community ◽  
Rapd Pcr ◽  
Wetland Water ◽  
Different Types ◽  
Viral Communities

Viruses are the most abundant and ubiquitous biological entities in various ecosystems, yet few investigations of viral communities in wetlands have been performed. To address this data gap, water samples from 6 wetlands were randomly collected across northeast China; viruses in the water were concentrated by sequential tangential flow filtration, and viral communities were assessed through randomly amplified polymorphic DNA-PCR (RAPD-PCR) with 4 decamer oligonucleotide primers. Principal coordinate analysis and hierarchical clustering analysis of the DNA fingerprints showed that viral community compositions differed among the water samples: communities in the 2 coastal wetlands were more similar to each other than to those in the 4 freshwater wetlands. The Shannon-Weaver index (H) and evenness index (E) of the RAPD-PCR fingerprint also differed among the 6 wetlands. Mantel test revealed that the changes in viral communities in wetland water were most closely related to the water NH4+-N and inorganic C content, followed by total K, P, C and NO3--N. DNA sequence analysis of the excised bands revealed that viruses accounted for ~40% of all sequences. Among the hit viral homologs, the majority belonged to the Microviridae. Moreover, variance partitioning analysis showed that the viral community contributed 24.58% while environmental factors explained 30.56% of the bacterial community variation, indicating that the bacterial community composition was strongly affected by both viral community and water variables. This work provides an initial outline of the viral communities from different types of wetlands in northeast China and improves our understanding of the viral diversity in these ecosystems.

Observed changes in shallow soil temperatures in Northeast China, 1960-2007

2016 ◽  
Vol 67 (1) ◽  
pp. 31-42 ◽  
Author(s):  
Y Liu ◽  
L Wang ◽  
B Liu ◽  
M Henderson
Keyword(s):  
Northeast China ◽  
Shallow Soil ◽  
Soil Temperatures

Multi-index drought characteristics in Songhua River basin, Northeast China

2019 ◽  
Vol 78 (1) ◽  
pp. 1-19 ◽  
Author(s):  
MA Faiz ◽  
D Liu ◽  
Q Fu ◽  
F Baig ◽  
AA Tahir ◽  
...  
Keyword(s):  
River Basin ◽  
Northeast China ◽  
Songhua River ◽  
Multi Index ◽  
Songhua River Basin ◽  
Drought Characteristics

Reflections on the Revitalization of Northeast China

2016 ◽  
Vol 6 (5) ◽  
pp. 307-315
Author(s):  
Fei Lu
Keyword(s):  
Northeast China
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