Climate and lake ecosystem evolution over the last millennium on the north-eastern Tibetan Plateau: Insights from stable isotope records of gastropod shells in Xing Co

IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Yunqing Li , Wanyi Zhang , Siyao Liu , Yanrong Zhang , Xianyong Cao , Fang Tian
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Abstract

The evolution of alpine lake ecosystems on the north-eastern Tibetan Plateau (NETP) over the last millennium has been affected by climate change and human activity. This study reconstructs the palaeoclimate and lake productivity of Xing Co using carbon and oxygen isotopes from aquatic gastropod shells (δ13Cshell and δ18Oshell), grain-size, total organic carbon (TOC), total nitrogen (TN), and the TOC/TN (C/N) ratio. The highest lake productivity – during the Medieval Warm Period (MWP) – is likely linked to enhanced photosynthesis of aquatic plants and increased biomass within the lake. This increase was driven by warm, humid climate conditions, indicated by higher δ13Cshell values, lower δ18Oshell values, and increased coarse-grain content. In contrast, the significant decline in lake productivity during the Little Ice Age (LIA) resulted from deterioration of trophic status and restricted aquatic plant growth under colder, drier climate conditions. However, the decrease in lake productivity since 1950 CE, amid global warming, may be linked to increased soil erosion and sedimentation rate from intensified human activity and land-use changes. The combined effects of climatic shifts and human disturbances highlight the need for ongoing monitoring of lake ecosystems to understand their resilience and response to future environmental changes.
青藏高原东北部近千年气候与湖泊生态系统演化——来自兴科腹足类贝壳稳定同位素记录的启示
近千年来青藏高原东北部高寒湖泊生态系统的演变受到气候变化和人类活动的影响。利用水生腹足动物(δ13Cshell和δ18Oshell)的碳、氧同位素、粒度、总有机碳(TOC)、总氮(TN)和TOC/TN (C/N)比值重建了兴钴的古气候和湖泊生产力。在中世纪暖期(MWP)期间,湖泊的最高生产力可能与水生植物的光合作用增强和湖泊内生物量增加有关。这种增加是由温暖潮湿的气候条件驱动的,表现为较高的δ13Cshell值和较低的δ18Oshell值,以及粗粒含量的增加。相比之下,小冰期湖泊生产力的显著下降是由于在更冷、更干燥的气候条件下,营养状况恶化和水生植物生长受到限制。然而,自1950年以来,在全球变暖的情况下,湖泊生产力的下降可能与人类活动加剧和土地利用变化造成的土壤侵蚀和沉积速率增加有关。气候变化和人为干扰的综合影响凸显了对湖泊生态系统进行持续监测的必要性,以了解其恢复能力和对未来环境变化的反应。
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来源期刊
CiteScore
5.90
自引率
10.00%
发文量
398
审稿时长
3.8 months
期刊介绍: Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.
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