文献类型： 外文期刊

作者： Hu, Jianan ¹ ; Nan, Zhuotong ¹ ; Ji, Hailong ¹ ; Zhao, Shuping ¹ ; Ou, Minyue ¹ ;

作者机构： 1.Nanjing Normal Univ, Minist Educ Virtual Geog Environm, Key Lab, Nanjing 210023, Peoples R China

2.Jiangsu Acad Agr Sci, Wuxi Branch, Wuxi 214174, Peoples R China

3.Jiangsu Ctr Collaborat Innovat Geog Informat Resou, Nanjing 210023, Peoples R China

关键词： ecological resilience; permafrost; net primary production; process-based modeling; Qinghai-Tibet Plateau

期刊名称：ENVIRONMENTAL RESEARCH LETTERS （ 影响因子：5.6； 五年影响因子：7.2 ）

ISSN： 1748-9326

年卷期： 2024 年 19 卷 10 期

页码：

收录情况： SCI

摘要： Climate warming poses complex challenges for alpine ecosystems on the Qinghai-Tibetan Plateau (QTP), further exacerbated by permafrost degradation. Quantifying the specific ecological impacts of permafrost thaw remains elusive, as ecological variations are also influenced by external climate factors. This study tackles this gap by employing the Noah-MP model to simultaneously simulate permafrost thermal-hydrological dynamics and net primary production (NPP) across the Three River Headwaters Region from 1989 to 2018. Model results were validated against observations. To isolate the ecological effects of permafrost thaw, we implemented a novel relative time transformation on the simulation results. Our analysis reveals a 7.5 x 104 km2 reduction in permafrost coverage during the study period, coinciding with a 1.09 g C m-2 yr-2 increase in NPP. While precipitation is the primary driver of NPP changes in most years, soil moisture emerges as a crucial factor during permafrost disappearance, when the ground transitions to seasonally frozen ground. Surprisingly, the NPP response to permafrost disappearance exhibited a transient effect, diminishing to negligible levels within five years post-thaw. These findings enhance our understanding of the intricate and dynamic responses of the QTP ecosystem to permafrost degradation under a warming climate.