岱海近百年环境演化地球化学指标时间序列数据集（过去100 a）

草原是最重要的陆地生态系统之一，作为碳汇，从而减少了温室气体的排放。然而，由于缺乏高分辨率的记录，长期的人为活动对草地生态系统碳循环的影响仍存在很大的不确定性。基于放射性核素（210Pb和137Cs）的年表显示，该记录跨越了过去的80年，时间分辨率为0.3-7.6年每厘米。总有机碳（TOC）和总氮（TN）摩尔比和稳定碳同位素组成的总有机碳（δ13CTOC）分别从13.9-19.1和−27.0 - −23.9‰，表明沉积有机质主要来自陆地植被-土壤系统。利用岱海沉积物的有机碳、总氮和有机碳同位素指标重建了岱海湖泊流域碳输移过程，揭示了近百年来人类活动（农业耕作和放牧）对农牧交错带生态系统碳循环的影响。

Grasslands are one of the most important terrestrial ecosystems, acting as carbon sinks and thereby reducing greenhouse gas emissions. However, due to the lack of high-resolution records, there remains great uncertainty regarding the impacts of long-term anthropogenic activities on the carbon cycle of grassland ecosystems. Chronologies based on the radionuclides lead-210 (210Pb) and cesium-137 (137Cs) indicate that this record spans the past 80 years, with a temporal resolution of 0.3–7.6 years per centimeter. The molar ratios of total organic carbon (TOC) to total nitrogen (TN) and the stable carbon isotope composition of total organic carbon (δ13C_TOC) range from 13.9 to 19.1 and from −27.0 to −23.9‰, respectively, indicating that the sedimentary organic matter mainly originates from the terrestrial vegetation-soil system. Using the organic carbon, total nitrogen, and organic carbon isotope proxies from Lake Daihai sediments, we reconstructed the carbon transport processes in the Lake Daihai watershed, revealing the impacts of anthropogenic activities (agricultural cultivation and grazing) on the carbon cycle of ecosystems in the agro-pastoral ecotone over the past century.

搜集汇总

背景与挑战

背景概述

该数据集记录了岱海流域过去100年的环境演化地球化学指标，重点关注草原碳汇和放射性核素，揭示了人类活动对生态系统碳循环的影响。数据具有较高的时间分辨率和可信度，适用于生态学研究。