关键词: 土壤全氮, 城市湿地, 土地利用类型, 土壤有机碳

Abstract: 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 (δ^88/86Sr) 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 δ^88/86Sr 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 δ^88/86Sr could be the future direction in the study of terrestrial ecosystems.  

Key words: urban wetland, soil organic carbon, soil total nitrogen., land use type