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Climate-induced permafrost degradation exerts species-specific impacts on pine and larch growth in the Da Xing’anling Mountains, Northeast China
Agricultural and Forest Meteorology ( IF 5.6 ) Pub Date : 2025-06-02 , DOI: 10.1016/j.agrformet.2025.110665
Yabo Wang, Xiaohong Liu, Huijun Jin, Xiaomin Zeng, Xianliang Zhang, Huhu Kang, Shichang Kang, Yao Li, Qiuliang Zhang
Agricultural and Forest Meteorology ( IF 5.6 ) Pub Date : 2025-06-02 , DOI: 10.1016/j.agrformet.2025.110665
Yabo Wang, Xiaohong Liu, Huijun Jin, Xiaomin Zeng, Xianliang Zhang, Huhu Kang, Shichang Kang, Yao Li, Qiuliang Zhang
Forests in permafrost regions are particularly sensitive to hydroclimatic changes. To investigate tree responses to climatic and hydrological changes in hemi-boreal forests of Northeast China, we collected 405 tree-ring cores from key conifer species, including Dahurian larch (Larix gmelinii (Rupr.) Kuzen) and Mongolian pine (Pinus sylvestris var. mongolica Litv.), across nine sampling sites in the Da Xing’anling Mountains in the western part of Northeast China. Basal area increment (BAI) was calculated to reflect tree growth, while the stable hydrogen isotope ratio in lignin methoxy groups (δ2HLM) served as an indicator of water supply in a warming environment. Employing the Bayesian stable isotope mixing model (MixSIAR), we determined that ground surface temperature (including both dormancy and growing-season temperatures) and the permafrost environment (based on ground thermal stability) significantly influence the contributions of current year precipitation (CYP) and soil stored moisture (SSM) to trees water source. Our findings indicate that, in the Da Xing’anling Mountains, the shallow-rooted Dahurian larch shows more pronounced fluctuations in plant water availability, whereas the deeper-rooted Mongolian pine benefits from permafrost degradation. Over time, the growth of Dahurian larch may be constrained by altered soil water infiltration caused by rising soil temperatures and permafrost degradation. In contrast, Mongolian pine may initially gain from moisture released by degrading permafrost. However, as temperatures continue to rise, Mongolian pine exhibits increased sensitivity to hydrological fluctuations and lower drought resilience compared to Dahurian larch. In the short term, Mongolian pine is more vulnerable to drought due to its reduced drought response capacity. Over the long term, with ongoing climate change and permafrost degradation, this diminished drought resilience is expected to pose greater survival challenges for Mongolian pine relative to Dahurian larch. Our findings provide critical insights for assessing ecological risk in hemi-boreal forests of Northeast China and other northern regions, offering guidance for informed management in a warming climate.
更新日期：2025-06-03
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