Hydrology and Ecological Evolution in a Permafrost Region in Northeast China Since the Late Pleistocene

作者：Rui Liu, Lin Zhao, Xiaodong Wu, Xiaofeng Cheng, Boxiong Zhang, Jianxiang He, Dongyu Yang, Shuying Zang · 发表于：Ecology and Evolution · 年份：2025 · DOI：10.1002/ece3.71935 · 被引用次数：2 · 研究领域：Geology and Paleoclimatology Research

ABSTRACT Northeast China is the southern margin of the Eurasian permafrost region, which is very sensitive to global change. However, the historical hydrology and ecological evolution in a concentrated distribution of permafrost in this region remain unclear, hindering our understanding of past and future changes in this region in the context of global warming. Here, we obtained a complete permafrost core from the Mohe Basin in the Greater Khingan Mountains in Northeast China. We reconstructed the hydrology and ecological evolution of the permafrost region since the Late Pleistocene (30 cal. ka BP) using organic geochemical evidence (including TOC, TN, C/N ratio, stable isotopes δ 13 C org and δ 15 N) from a permafrost core, as well as AMS 14 C dating. The results indicate that the environment in the permafrost region in the Mohe Basin closely aligned with the glacial, deglaciation, and interglacial. Between the Last Mega‐Interstadial and the Last Glacial Maximum (30–19 cal. ka BP), the surface runoff gradually decreased, primary productivity was low, the wetlands shrank until they disappeared, and a grassland ecosystem formed. During the Last Deglaciation (19–11.5 cal. ka BP), although the organic matter content fluctuated, the surface runoff and primary productivity increased, and the catchment area of the watershed expanded, leading to redevelopment of the wetlands, and a coniferous‐dominated mixed forest wetland ecosystem formed. In the Early to Middle Holocene (11.5–5.8 ...