摘要
为揭示南矶山湿地植硅体沉积分布特征并反演气候变化过程,通过采集沉积柱状样和17处表土样品,基于210Pb放射性元素测年建立了沉积芯年代序列,提取并分析了表土和沉积柱中植硅体组合分布特征。结果共鉴定出植硅体类型19类,其中表土中主要代表类型是示暖型的扇型、方型、长方型、哑铃型和示冷型的尖型、平滑棒型等,其平均占比分别为24.43%、11.21%、9.85%、6.95%、6.50%、8.82%。柱状样沉积物测年共计74 a,沉积柱中代表类型是示暖型的方型、长方型、扇型,示冷型的帽型、尖型、平滑棒型等,其平均占比分别为7.20%、10.41%、20.81%、7.69%、7.71%、8.62%。沉积样中示暖型植硅体平均占比66.19%,示冷型植硅体平均占比31.65%。结合气候温度数据,气候温暖指数Iw与干旱指数Iph结果表明南矶山近百年温度呈升高趋势,环境经历了由湿润到干燥再到湿润的变化过程。构建的南矶山湿地沉积植硅体-气候因子转换模型表明,南矶山湿地近百年气候环境特征可以分为3个阶段,1945—2003年,气候环境温凉湿润,2003—2012年气候环境温暖偏干,2012—2018年气候环境温暖湿润。
In order to reveal the sedimentary distribution characteristics of phytolith in Nanjishan wetland and reverse the climate change process, the sedimentary column sample and 17 topsoil samples were collected, and the sedimentary core chronological sequence based on210Pb radioactive element dating was established, and the phytoliths were extracted from the samples and their distribution characteristics of combination were analyzed in this paper. The results showed that a total of 19 phytolith types were identified. The main representative types in topsoil were fan type, square, rectangle, dumb bell of the warm types and point, smooth-elongate of the cold types, which accounted for 24.43%, 11.21%, 9.85%, 6.95%, 6.50%, 8.82%, respectively. Columnar sediments were dated for 74 years, and the representative types in sedimentary column were Square, Rectangle, Fan type of the warm types and Trapezoid, Point, Smooth-elongate of the cold types, which accounted for 7.20%,10.41%,20.81%,7.69%,7.71%,8.62%, respectively.The average proportion of warm phytoliths was 66.19% and that of cold phytoliths was 31.65%.Combined with climate temperature data, climate warmth index(Iw) and drought index(Iph) results showed that the temperature in Nanjishan has been increasing in the past 100 years, and the environment has experienced a change process from humid to dry and then to humid.The constructed deposited phytolith-climate factor conversion model of Nanjishan wetland showed that the climatic environment characteristics of Nanjishan Wetland during the past 100 years can be divided into three stages: the climatic environment was cool and humid from 1945 — 2003;the climatic environment was warm and arid from 2003 — 2012;the climatic environment was warm and humid from 2012 — 2018.
作者
胡克龙
计勇
刘星辰
史艳萍
蔡高堂
张洁
HU Kelong;JI Yong;LIU Xingchen;SHI Yanping;CAI Gaotang;ZHANG Jie(School of Hydraulic and Ecological Engineering,Nanchang Institute of Technology,330099,Nanchang,PRC)
出处
《江西科学》
2023年第1期80-86,共7页
Jiangxi Science
基金
江西省教育厅科技项目(GJJ180927)
江西省科技厅项目(20212BDH81002,20202BBGL73094)
江西省“双千计划”资助项目(JXSQ2019201021)
江西省研究生创新计划资助项目(YC2021-S806)。
关键词
南矶山湿地
植硅体
沉积特征
气候反演
Nanjishan wetland
photolith
sedimentary characteristics
climate inversion
