Dongying is one of the most important cities in the Yellow River Delta. Water ecosystem, an important component of wetland eco-environment, is the basic condition for the survival and development of human beings and nature. Water ecosystems are complex and diverse, involving a wide range of content. It is difficult to describe quantitatively the influence factors of water ecosystem change and the level of influence by the common theoretical methods. According to the principles of scientific, comprehensive and operational, the water ecosystem evaluation system of 8 indexes based on time series, such as population, per capita water resources, and the amount of agricultural chemical fertilizer, is constructed. The system based on principal component analysis, extracting principal component of index data, quantitatively descripting the actual degree of ecological water environmental affected by each index, and to evaluate the water ecosystem quality of each year. The index system and principal component analysis are applied to the evaluation and influencing factors of water ecosystem in the Yellow River Delta, Dongying. The results show that the water ecosystem of Dongying City is deteriorating year after year. There are 5 main influencing factors of water ecosystem, and the secondary influence indexes have 2. This paper provides a basis for making water ecosystem protection measures for the relevant departments of the Yellow River Delta.
Key words
water ecosystem /
principal component analysis /
index /
SPSS
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