锶同位素在森林生态系统研究中的进展

Strontium isotopes in forest ecosystem study:A review

放射性成因锶同位素(87Sr/86Sr)作为一种有效的示踪工具,对理解陆相生态系统结构有极其重要的作用。而非传统稳定同位素δ88/86Sr可以揭示以前所忽略的阳离子在植被中的迁移过程。本文对锶元素在森林生态系统中的循环过程以及定量计算方法进行了综述,阐明了利用放射性成因锶同位素87Sr/86Sr在低温地表迁移过程中不分馏的特性示踪物质来源以及循环途径,利用非传统稳定锶同位素δ88/86Sr来示踪生态系统中生物分馏过程,以及锶元素在植被中的内循环机理,总结采用锶同位素在环境响应和生态系统演化的应用。指出非传统稳定锶同位素与放射性成因锶同位素联立应用将是其在陆地生态系统研究中的发展方向。

Radiogenic strontium（Sr） isotope（87Sr/86Sr） is an effective tool for tracing the sources and behaviors of Sr in the environment,playing a very important role in understanding the structure and function of terrestrial ecosystems,whereas non-traditional stable Sr isotope（δ88/86Sr） can reveal the translocation of the previously neglected cations in vegetations.This paper reviewed the biogeochemical cycling of Sr in forest ecosystems and the related quantification methods,elaborated the principles of using the non-fractionation characters of 87Sr/86Sr in the low-temperature hypergenic environment to trace the sources and cycling paths of nutrient cations,the principles of using δ88/86Sr to trace the biological fractionation processes in ecosystems,and the mechanisms of the biogeochemical cycling of Sr in vegetations,and summarized the applications of Sr isotopes in the studies of environmental changes and of the evolution of ecosystems.It was suggested that the combined application of 87Sr/86Sr and δ88/86Sr could be the future direction in the study of terrestrial ecosystems.