2026-10-11T20:54:58Z https://www.scidb.cn/oai

10.57760/sciencedb.cjae.00103 2026-06-24T19:26:33Z

2026-06-24 Dataset of Variation and Driving Mechanisms of Active Layer Thickness in the Permafrost Region of the Daxing’anling Mountains, Northeast China doi:10.57760/sciencedb.cjae.00103 en The Daxing’anling Mountains permafrost region, located at the southern margin of the Eurasian mid-to-high latitude permafrost belt, is a critical response area for permafrost degradation in cold regions under global warming, but the spatiotemporal variation patterns and driving mechanisms of its active layer thickness (ALT) remain to be further clarified. Based on the Stefan equation and structural equation model (SEM), combined with multi-source data, we investigated the spatiotemporal differentiation and driving mechanisms of ALT in the Daxing’anling Mountains permafrost region from 1982 to 2022. The results showed that from 1982 to 2022, the multi-year average ALT in the Daxing’anling Mountains permafrost region was (141.55±38.09) cm. Among them, the average ALT values for the extensive continuous permafrost zone, the extensive-island permafrost zone, and the island, sporadic, and scattered permafrost zone were (107.28±12.43) cm, (125.04±14.92) cm, and (165.54±35.63) cm, respectively. Temporally, the ALT in the study area increased significantly at a rate of (0.44±0.20) cm·a-1, indicating a continuous degradation trend of permafrost in this region over the past 40 years. Meanwhile, the thickening rate of ALT increased from (0.30±0.05) cm·a-1 in the northern extensive continuous permafrost zone to (0.53±0.21) cm·a-1 in the southern island, sporadic, and scattered permafrost zone. SEM analysis revealed that mean annual air temperature exerted a significant driving effect on ALT changes (total effect = 0.79); soil moisture showed a significant inhibitory effect (total effect = −0.41); and factors such as air temperature, precipitation, and vegetation cover jointly influenced ALT dynamics through complex interactions. In conclusion, from 1982 to 2022, the ALT in the Daxing’anling Mountains permafrost region thickened significantly, with a clear permafrost degradation trend that intensified from north to south, and its change was primarily regulated by the combined effects of air temperature and soil moisture. This study would provide a scientific basis for monitoring mid-to-high latitude permafrost degradation and assessing its ecological and environmental effects.  permafrost degradation; active layer thickness; Stefan equation; spatio-temporal variation; structural equation modeling (SEM) Chen Zhuxin Song Yingjie Li Jianuo Zhang Bo Huang Ziyan Guo Meng EMBARGO https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank