关键词: 景观空间格局, 动态转移, CLUE-S模型, 太湖流域, 景观指数

Abstract: Recently, the environmental pollution by the heavy metal cadmium has become more and more serious. In order to improve environmental quality, it is very significant to identify and control the sources of Cd pollution. Cd isotopes have played an important role as powerful tracers in environmental science. Referring to the latest research of Cd isotopes, this paper discusses Cd isotopic principles, separation of Cd from samples, selection of the standard solutions, the method of determination and instrument mass fractionation correction, Cd isotopic composition and fractionation mechanism, and the application of Cd isotopes in environmental science. Considering the methods and procedures applied for previous studies, certain modifications with respect to the application of Cd isotopes in environmental science should be carried out. The Cd isotopic standard solutions should be unified. The methods of determining the composition of Cd isotopes and correcting instrument mass fractionation should be selected according to the Cd concentrations in different samples. More information on Cd isotopic compositions of natural substances is needed and the fractionation mechanism of Cd isotopes has to be further studied.

Key words: landscape spatial pattern, dynamic transfer, landscape index, Taihu Lake basin., CLUE-S model