摘要
以岱海水-沉积物系统中BSi的地球化学特征为基础,结合沉积物中BSi的空间分布和垂向分布以及BSi与古环境古气候的响应关系,对岱海硅藻类浮游植物初级生产力的Si限制理论进行了探索.研究发现,岱海上覆水中Si的平均含量仅为0.38 mg/L,而表层沉积物中BSi的平均含量达到7.5 mg/g;水-沉积物系统中SiO32-和BSi的空间分布特征揭示了生源硅的主要来源;水-沉积物系统中Si与C、N、P的比值及BSi与古环境古气候的响应关系阐明了Si成为硅藻浮游植物初级生产力限制因子的主要原因;不同历史时段内,Si成为岱海硅藻浮游植物初级生产力限制因子的主导原因不同.
The Daihai Lake（40°29′27″-40°37′6″N,112°33′31″-112°46′40″E） is a typical inland lake in a semiarid region in Inner Mongolia,China.Based on the geochemistry character of biogenic silica（BSi） in the water-sediments system of the Daihai Lake,the theory of silicate limitation of Primary Production by Diatoms phytoplankton in the Daihai Lake are discussed in this work by interpreting the information of the BSi concentrations,horizontal and vertical distributions and the response relation between BSi and past environmental conditions.It is found that the concentration of Si is very low in overlying water while very high in the sediments.The spatial distribution patters of SiO3^2- and BSi suggest the Si source of the lake.The geochemistry information of BSi is well archived in the lake sediment profiles,and the geochemistry information of BSi well responses to the past environmental conditions of the Daihai drainage basin.The ratios between Si,and C,N,P in the water-sediment system and the response relation between BSi and past environmental conditions indicate the main reasons for the theory of silicate limitation of Primary Production by Diatoms phytoplankton.Furthermore,the dominant factor for silicate limitation of Primary Production by Diatoms phytoplankton is different in different periods.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2010年第3期639-644,共6页
Environmental Science
基金
国家自然科学基金项目(40863003)
内蒙古自然科学基金项目(2009BS0601)
内蒙古大学"513工程"基金项目
内蒙古大学高层次引进人才科研启动基金项目(Z20080209)
关键词
限制因子
生源硅
地球化学
湖泊
limiting factor
biogenic silica
geochemistry
lakes
