生态系统营养离子循环及水化学演化的锶同位素示踪

综述了Ｓｒ同位素示踪生态系统离子循环和水化学演化的基本原理、主要内容和最新进展。着重介绍了Ｓｒ同位素在矿物风化速率研究、流域营养离子来源识别及其循环通量计算、地下水体化学成分演化机制的研究中的示踪应用；最后展望了Ｓｒ同位素在生物地球化学过程示踪上的潜在价值。

USING STRONTIUM ISOTOPES TO TRACE NUTRIENT ELEMENT CIRCULATION AND HYDROCHEMICAL EVOLUTION WITHIN AN ECOSYSTEM

With the advances of theory and analysis technique of Sr isotopes, the application of stable Sr isotope as tracers of biogeochemical processes on both the catchment and global scales has increased considerably in recent years, and it continues to provide new insight into many different research problems. This paper reviews the basic principle, main research content and recent progresses of using Sr isotopes to trace nutrient element circulation and hydrochemical evolution in ecosystems. The authors emphasize the application of strontium isotopes to study mineral weathering rates, identify resources of nutrient elements, calculate circulation fluxes of the elements and trace hydrochemical evolution mechanism of groundwater. At the same time, the authors point out the complexity and problems needing attention when Sr isotope are used as tracers of biogeochemical processes. At last, the potential application of strontium isotope to trace biogeochemical processes is discussed.