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Influences of environmental factors on the modern 14C reservoir effects in Qinghai-Tibet Plateau lakes

Journal of Mountain Science 2021年第12期18卷 3179-3189页

作者： DU Ding-ding LI Zhi-wen HU Hai-ping BAI Yong-hui LI Wen MUGHAL Muhammad Saleem QIAN Hai-Yan East China University of Technology Key Laboratory for Digital Land and Resources of Jiangxi ProvinceNanchang 330013China Lanzhou University School of Earth SciencesLanzhou 730000China School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000China Institute of Geology University of Azad Jammu and KashmirMuzaffarabad 13100Pakistan

The establishment of reliable age in the lake sediment profile mainly depends on the AMS 14C dating ***,the presence of the 14C lake reservoir effects(LREs)restricted for using radiocarbon dating in lake sediment,especially in dry and cold areas with a scarce plant cover in the Qinghai-Tibet ***,the discussion of influence factors of LREs is *** paper selected 15 lakes(17 sediment and 3 plant samples)in the Qinghai-Tibet Plateau to examine the distribution characteristics of the modern LREs and their main influencing *** our study area,14 lakes were all affected by the *** minimum 14C year is 5900 a BP towards the deep water area,whereas the maximum 14C year is up to 7185 a BP in the margins of Lake *** maximum 14C year is up to 7750 a BP,and the minimum 14C year is present-day carbon in the 15 *** further study indicated that the LRE differences in individual lake are mostly owing to the contribution of exogenous *** results displayed that the LREs tended to increase with the increase of the salinity,moreover,the LREs of saltwater lakes or salt lakes were significantly larger than freshwater lakes due to the possible supply of old total dissolved inorganic carbon with a long residence time in the ***,the contribution of calcite played a significant role on the ***,the LREs differences are affected by the source of organic *** lake with groundwater supply shows large LRE due to likely being influenced by crustal and ancient CO_(2) uprising.

关键词： Qinghai-Tibet Plateau hydro-chemistry indexes Lake surface sediments Lake reservoir effects

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