Permafrost changes in the Nanwenghe Wetlands Reserve on the southern slope of the Da Xing'anling‒Yile'huli mountains, Northeast China

Advances in Climate Change Research

Chuan-Fang Zhou¹  Dong-Liang Luo²  Xiao-Ying Li³  Xiao-Li Chang⁴  Shao-Peng Yu⁴  Xin-Yu Li⁵  Chang-Lei Wei⁶  Xiao-Ying Jin⁶  Xue Yang⁶  Li-Zhong Wang⁷  Tao Che⁷  Rui-Xia He⁸  Ning Jia⁸  Wei-Hai Li⁸  Hui-Jun Jin⁸ 

[1] Corresponding author. School of Civil Engineering, Northeast Forestry University, Harbin, 100040, China.;Institute of Cold Regions Science and Engineering, School of Civil Engineering, Northeast-China Observatory and Research-Station of Permafrost Geo-Environment (Ministry of Education), and Northeast Forestry University, Harbin, 150040, China;School of Geography and Tourism, Harbin University, Harbin, 150086, China;China Forest Ecological Research Network (CFERN) Station at the Headwater Area of Nenjiang River, Daxing'anling Institute of Agriculture and Forestry, Daxing'anling Forestry Group, Jagdaqi, 165100, China;Harbin Center for Natural Resources Survey, Geological Survey of China, Harbin, 150086, China;Institute of Cold Regions Science and Engineering, School of Civil Engineering, Northeast-China Observatory and Research-Station of Permafrost Geo-Environment (Ministry of Education), and Northeast Forestry University, Harbin, 150040, China;School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China;State Key Laboratory of Frozen Soils Engineering and Da Xing'anling Observation and Research Station of Frozen-Ground Engineering and Environment, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 73000, China;

关键词: Nanwenghe wetland reserve;    Permafrost;    Climate change;    Active layer thickness;    Ground thermal state;    Thermal offset;   

DOI  :  

来源: DOAJ

【 摘 要 】

The Nanwenghe Wetlands Reserve in the Yile'huli Mountains is a representative region of the Xing'an permafrost. The response of permafrost to climate change remains unclear due to limited field investigations. Thus, longer-term responses of the ground thermal state to climate change since 2011 have been monitored at four sites with varied surface characteristics: Carex tato wetland (P1) and shrub-C. tato wetland (P2) with a multi-year average temperatures at the depth of zero annual amplitude (TZAA) of −0.52 and −1.19 °C, respectively; Betula platyphylla-Larix gmelinii (Rupr.) Kuzen mixed forest (P3) with TZAA of 0.17 °C, and; the forest of L. gmelinii (Rupr.) Kuzen (P4) with TZAA of 1.65 °C. Continuous observations demonstrate that the ecosystem-protected Xing'an permafrost experienced a cooling under a warming climate. The temperature at the top of permafrost (TTOP) rose (1.8 °C per decade) but the TZAA declined (−0.14 °C per decade), while the active layer thickness (ALT) thinned from 0.9 m in 2012 to 0.8 m in 2014 at P1. Both the TTOP and TZAA increased (0.89 and 0.06 °C per decade, respectively), but the ALT thinned from 1.4 m in 2012 to 0.7 m in 2016 at P2. Vertically detached permafrost at P3 disappeared in summer 2012, with warming rates of +0.42 and + 0.17 °C per decade for TTOP and TZAA, respectively. However, up to date, the ground thermal state has remained stable at P4. We conclude that the thermal offset is crucial for the preservation and persistence of the Xing'an permafrost at the southern fringe.

【 授权许可】

Unknown