Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.1016/j.catena.2026.109997 |
| Titel (primär) | Reconstructing anthropocene carbon dynamics: Tracking sedimentary organic matter sources with multiple proxies in a temperate semi-arid lake (Hulun, northern China) |
| Autor | Du, C.; Kong, X.; Zhang, C.; Xue, B.; Zhang, F.; Sun, D.; Jiang, Q.; Yao, S.; Lin, Y. |
| Quelle | Catena |
| Erscheinungsjahr | 2026 |
| Department | SEEFO |
| Band/Volume | 267 |
| Seite von | art. 109997 |
| Sprache | englisch |
| Topic | T5 Future Landscapes |
| Supplements | Supplement 1 |
| Keywords | Hulun Lake; N-alkanes; Carbon burial; Carbon source; Semi-arid ecosystems; Sediment core |
| Abstract | Understanding the sources and dynamics of carbon burial in lake sediments is critical for reconstructing ecosystem evolution and assessing carbon sequestration potential under changing climate and anthropogenic pressures. However, systematic investigations of carbon burial in large shallow lakes in northern China under temperate and semi-arid climate remain scarce. Hulun Lake, the largest freshwater lake in northern China's drylands, provides a valuable archive for tracing carbon source changes due to its sensitivity to environmental variability. This study presents a comprehensive analysis of organic carbon (OC) burial dynamics in Hulun Lake through multi-proxy examination of sedimentary records since the 1850s. A total of 16 surface sediments in Lake Hulun showed heterogeneous OC distribution, with stronger terrestrial inputs (deduced from the predominance of long-chain n-alkanes) in the southeast and higher aquatic contributions (deduced from the predominance of mid/short-chain n-alkanes) in the central-western regions. Spatial differences were primarily driven by natural factors (e.g., precipitation gradients and water depth), with human activities intensifying OC burial in the northern region. Two sediment cores (northern S12 and southern S7) revealed spatiotemporal variations over the past century: the northern basin exhibited 2.34-fold higher OC burial rates (53.09 vs. 22.69 g/(m2·a)) and greater terrestrial dominance (60–65% pre-1930s), while the southern basin showed lower burial rates and a stronger influence of aquatic sources. Since the 1930s, aquatic productivity has increased in both areas, and anthropogenic eutrophication post-1980s has further increased algal-derived OC (up to 23%), particularly in the north. |
| Du, C., Kong, X., Zhang, C., Xue, B., Zhang, F., Sun, D., Jiang, Q., Yao, S., Lin, Y. (2026): Reconstructing anthropocene carbon dynamics: Tracking sedimentary organic matter sources with multiple proxies in a temperate semi-arid lake (Hulun, northern China) Catena 267 , art. 109997 10.1016/j.catena.2026.109997 |
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