登录 | 注册 | 中文  | English  | 用时: 0.65s
元数据
高级检索
首页 > 中国极地考察知识库 > 成果信息库 > 已审查 南极普里兹湾表层沉积物有机地球化学特征及其生态环境意义

南极普里兹湾表层沉积物有机地球化学特征及其生态环境意义

【标题】南极普里兹湾表层沉积物有机地球化学特征及其生态环境意义

【Title】ORGANIC GEOCHEMICAL CHARACTERISTICS OF SURFACE SEDIMENTS AND IMPLICATIONS FOR ECOLOGY AND ENVIRONMENT IN PRYDZ BAY, ANTARCTICA

【DOI】10.13679/j.jdyj.2014.1.167

【作者】 赵军; 于培松; 韩正兵; 扈传昱; 潘建明

【Author】 Zhao Jun ; Yu Peisong ; Han Zhengbing ; Hu Chuanyu ; Pan Jianming

【期刊】极地研究

【Journal】

【期刊年份】2014

【卷】26

【期】1

【关键词】 普里兹湾; 生物标志物; 表层沉积物; 生态环境

【Keywords】 Prydz Bay; biomarker; surface sediment; ecology and environment

【摘要】 用气相色谱和气相色谱-质谱分析法分析了南极普里兹湾5个站位表层沉积物中多种生物标志物,探讨了其生态环境指示意义。结果显示:①湾内中心区总类脂物含量最高(1193 µg/g)、埃默里冰架区次之(572 µg/g)、陆坡区最低(341 µg/g),且与沉积有机碳、总糖、生物硅、菜籽甾醇、表层海水叶绿素a等参数显著正相关(p< 0.1),表明底层有机质与上层水体浮游植物密切相关。②C27甾烷含量与C28甾烷显著负相关(p< 0.01),指示着晶磷虾与硅藻的食物链关系。③相对较高的饱和烃/芳烃比值(> 2.5)、较低的Pr/C17(< 0.5)和Pr/Ph(< 2)证明沉积有机质主要来源于硅藻等浮游植物,同时饱和烃双峰群(C17或C18和C29)的存在及较高含量的C29甾烷(35.79%)指示外域有机质输入,且湾中心区的(CPI = 1.60,Pr/Ph = 1.01)要高于陆坡区和冰架区(CPI = 0.69,Pr/Ph = 0.39)。④湾中心区和冰架区脂肪酸C18:2/C18:0比值(0.78)要高于陆坡区(0.23)和低纬度地区(< 0.1),表明南极夏季普里兹湾陆坡区的表层海水温度要高于湾中心区和冰架区。

【Abstract】Multiple biomarkers has been analyzed by gas chromatography and gas chromatography – mass spectrum on surface sediments collected from 5 stations in Prydz Bay, East Antarctica, and its implication on ecology and environment has been discussed. The results showed that the concentration of total lipids was highest in the center area of Prydz Bay (1193 µg/g), follow by Amery Ice Shelf area (572 µg/g), and lowest in slope area (341 µg/g). It was significantly positive correlated with sedimentary organic carbon, total neutral monosaccharides, biogenic silica, brassicasterol, and chlorophyll a concentrations in surface sea water (p< 0.1), and indicated that organic matter preserved in surface sediment was mainly from marine phytoplankton. The significantly negative correlation of relative concentrations between C27and C28steranes showed the food chain betweenEuphausia crystallorophiasand diatoms. The relative high ratio of saturated hydrocarbons : arenes (> 2.5), low ratios of Pr/C17(< 0.5) and Pr/Ph (< 2) inferred the sedimentary organic matter was largely contributed by diatoms. Meanwhile, the double peak of saturated hydrocarbons (C17or C18, C29) and relative high concentration of C29steranes (35.79%) showed terrestrial vascular plants input, and it was higher in the center area of Prydz Bay (CPI = 1.60, Pr/Ph = 1.01) than the slope area and Amery Ice Shelf area (CPI = 0.69, Pr/Ph = 0.39). The ratio of C18:2/C18:0for fatty acids was higher in sediment collected from the center area and Amery Ice Shelf area of Prydz Bay (0.78) than that from slope area of Prydz Bay (0.23) and lower latitude regions (< 0.1), and indicated that during austral summer, the surface sea temperature was higher in slope area of Prydz Bay than center area of Prydz Bay and Amery Ice Shelf area.

【基金/项目】 南极普里兹湾百年来浮游植物结构变动对生物泵效率的影响及其与全球气候变化的关联 ; 近200年南极半岛海洋初级生产和藻类种群结构演变及其对快速融冰的响应 ; 南极普里兹湾近现代海洋生产和碳沉积记录及其对全球气候变化的响应 ; 南大洋普里兹湾生物硅的生产、溶解、沉降及其保存机制研究 ; 特殊生物标志物及其单体δ13C、δD 沉积记录—— ENSO对西南极地区浮游植物群落变化和碳循环的影响

【下载】 PDF