Biogenic silica composition and δ13C abundance in the Changjiang (Yangtze) and Huanghe (Yellow) Rivers with implications for the silicon cycle
Biogenic silica composition and δ13C abundance in the Changjiang (Yangtze) and Huanghe (Yellow) Rivers with implications for the silicon cycle
复制标题
长江和黄河中的生物硅成分和δ13C丰度对硅循环的影响
DOI：
10.1016/j.scitotenv.2016.11.161
复制
发表时间：
2017
影响因子：
9.8
通讯作者：
Jiaye Zang
中科院分区：
文献类型：
--
作者：
Xiangbin Ran;Bochao Xu;Jun Liu;Chenying Zhao;Sen Liu;Jiaye Zang
研究了一种基于生物硅组成和生物硅伴生有机质（δ 13 CBSi）δ 13 C值的河口陆源和海相生物硅（BSi）分离方法。我们用两条世界级的主要河流-长江和黄河作为例子来说明我们的方法。我们的研究结果表明，这些河流的BSi主要由植硅体和硅藻。河流BSi浓度随陆地输入和河流初级生产而变化。尽管河流BSi源复杂，但陆源δ 13 CBSi信号非常独特（− 24.7 ± 0.8），显著低于海洋δ 13 CBSi值（− 21.3 ± 0.07，黄海中部）（p< 0.01）。因此，BSi有机质中δ 13 C的变化可以提供河口及邻近陆架硅的地球化学特征的陆源信息。δ 13 CBSic组合可能作为一个有效的工具，在十年的时间尺度上研究沿海地区的环境变化，因为这个指数可以响应来自陆地的陆地通量的变化，以及在沿海海洋浮游植物组合的变化。
The study was carried out to address a method for separation of terrestrial and marine biogenic silica (BSi) in estuaries based on BSi compositions and δ13C values in BSi associated organic matter (δ13CBSi). We used two world-class major rivers - the Changjiang (Yangtze) and Huanghe (Yellow) Rivers as examples to illustrate our approach. Our results for these rivers indicate that riverine BSi is comprised mainly of phytoliths and diatoms. River BSi concentrations vary with terrestrial inputs and in-stream primary production. Although the fluvial BSi sources are complex, the terrestrial δ13CBSisignals are quite unique (− 24.7 ± 0.8), significantly lower than the marine δ13CBSivalues (− 21.3 ± 0.07, central Yellow Sea) (p< 0.01). Thus, the variation of δ13C within BSi organic matter can provide terrestrial source information on the biogeochemistry of silicon in estuaries and the adjacent shelf. The δ13CBSicombination could potentially act as an efficient tool to study environmental change in coastal areas on decadal time-scales since this index may respond to variable terrestrial fluxes from land, as well as to changed phytoplankton assemblages in the coastal ocean.