摘要
通过对沉积柱心元素和同位素的分析,结合放射性定年技术,研究滇池与抚仙湖近300年来不同时期有机碳、氮来源及其与人类活动的关系。结果表明,人类活动对滇池有机碳和氮的影响早于抚仙湖,且强度更大。在1950年后,逐渐增强的人类活动使滇池流域水土流失增大,滇池沉积物的总有机碳(TOC)含量、总氮(TN)含量持续上升。1970年后,随着人类活动的进一步加剧,生活污水与牲畜粪便成为了滇池氮的主要来源,湖泊内藻类大量繁殖。随着陆源有机质与土壤氮输入量缓慢增加,抚仙湖TOC含量与TN含量在1820—2000年经历了长时间的缓慢增长。2000年后,由于人类活动加剧,抚仙湖沉积物中陆源有机质比例明显增大,水土流失加剧;同时,城镇生活污水排放使得抚仙湖氮负荷不断升高。
Through elemental and isotopic analysis and radiometric dating of two sediment cores collected from Dianchi Lake and Fuxian Lake,the sources of organic carbon and nitrogen in sediments at different times in the past 300 years and their relationship with anthropogenic activities were explored.The results indicated that the impact of anthropogenic activities on organic carbon and nitrogen in Dianchi Lake is earlier and stronger than that in Fuxian Lake.After the 1950 s,the total organic carbon(TOC)and the total nitrogen(TN)in sediments of Dianchi Lake increased continuously due to exacerbated soil erosion by anthropogenic activities.After 1970 s,due to the intensification of anthropogenic activities,domestic sewage and manure became the main sources of nitrogen,and the number of algae in Dianchi Lake increased significantly.Fuxian Lake experienced slow and steady increases in TOC and TN from the 1820 s to the 2000 s due to increased inputs of terrestrial organic matter and soil nitrogen.After the 2000 s,the proportion of exogenous organic matter in the sediments of Fuxian Lake increased,probably due to increased anthropogenic activities and soil erosion;at the same time,increasing soil erosion and domestic sewage input increased the nitrogen load in the sediments of Fuxian Lake.
作者
吴泓辰
王敬富
杨小红
陈敬安
WU Hong-chen;WANG Jing-fu;YANG Xiao-hong;CHEN Jing-an(State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;University of Chinese Academy of Sciences,Beijing 100049,China;Guizhou Solid Waste Management Center,Guiyang 550002,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2022年第5期1014-1022,共9页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
中国科学院战略性先导专项(B类)课题(XDB40020400)
中国科学院科技服务计划项目(KFJSTSQYZD202124001)
中国科学院青年创新促进会(2019389)
国家重点研发计划项目(2021YFC3201000)
中央引导地方科技发展资金项目(黔科中引地[2021]4028)。
关键词
高原湖泊
沉积物
碳同位素
氮同位素
人类活动
plateau lake
sediment
carbon isotope
nitrogen isotope
anthropogenic activity
