关键词: 分层随机抽样, 多样性指数, 城市街道绿化树种结构

Abstract:

The research method of quantifying the structure of street tree populations was mainly described from the survey method selection and the calculation of the parameters of street tree populations. At the same time it was analyzed how to stratify the stratums and define the optimal samples by the stratified random sampling in the study of street tree populations, and some formulas were introduced for calculating the parameters of the urban street tree populations. In addition, Shannon-wiener index was compared with Simpson index in calculating the diversity index of tree species for planting urban street and the importance of the planting tree species was emphasized without containing relative frequency.

Key words: Stratified random sampling, Diversity index, Urban street tree populations