生物硅的测定及其生物地球化学意义  

THE DETERMINATION OF BIOGENIC SILICA AND ITS BIOGEOCHEMISTRY SIGNIFICANCE

作　　者：叶曦雯[1] 刘素美[1] 张经[1] 

机构地区：[1]青岛海洋大学化学化工学院,山东青岛266003

出　　处：《地球科学进展》2003年第3期420-426,共7页Advances in Earth Science

基　　金：国家重点基础研究发展规划项目"东;黄海生态动力学与生物资源可持续利用"(编号 :G19990 4370 5 );"我国近海有害赤潮发生的生态学;海洋学机制及预测防治"(编号 :2 0 0 1CB40 970 3);国家自然科学基金重点项目"胶州湾流域生源要素流失与海湾富营养化演变过程"(编

摘　　要：生物硅 (BSi)指用化学方法测定的沉积物中的无定形硅含量。生物硅的含量与水体中初级生产息息相关。硅藻、放射虫、海绵骨针和硅鞭毛虫产生的生物硅是地球化学和古海洋学研究的重要参数。重点讨论了目前生物硅测定方法中的化学提取法 ,评述了提取过程中存在的一些问题 。Biogenic silica(BSi) is a chemical determination of the amount of amorphous. BSi is also known as biogenic opal or simple opal by geologists. Recent compilation of percent biogenic silica in surface sediments have revealed a close link to biosiliceous productivity patterns in the overlying surface waters. Amorphous silica can be comprised of different components mainly of biological origin such as diatoms phytoliths, radiolarians, silicoflagellates and sponge spicules. The opal content of marine sediments carries a valuable paleoceanographic record of changes in the strengths and locations of surface ocean productivity. Measuring the silicon isotopic composition of diatoms can provide a record of environmental change. The BSi sedimentary record also has been used to study climate change. The sedimentary BSi record is a sensitive indicator of anthropogenic nutrient enrichment because it integrates seasonal uptake of dissolved silicate utilized in diatom production. In this paper,the author discussed some questions in the measurement of BSi in marine sediments and particulates. The importance of determination of biogenic silica in biogeochemical research is also analyzed.

关 键 词：生物硅 沉积物 粘土矿物 测定方法 

分 类 号：P593[天文地球—地球化学]