Comprehensive quantitative assessment models for ecological environment in arid area
旱区生态环境质量的综合定量评价模型

The quantitative assessment of local environmental conditions constitutes one of the most important issues for researchers in the area of sustainable development in arid areas. During the past two decades, a number of methods have been used to assess environmental quality. The methods include: comprehensive assessment methods, fuzzy assessment methods, gray system clustering, principle component analysis, factor analysis and projection pursuit algorithms. These models usually establish functions based on as...