Study on ecological impact of Saihanba Forest Farm Based on Evaluation Model

In order to evaluate the impact of Saihanba on ecological environment, we selecte 11 factors from three aspects build Ecological Environment Health Index (EEHI) evaluation model; Next, We use a combined weighting method combining Hierarchical Analysis, Entropy Weighting and Coefficient Variation determine weights each indicator. Then EEHI Seyhanba area 1962 2020 was calculated using TOPSIS; Finally, environment obtained with yearly upward trend, effect improvement analyzed in stages. anti-dust storm capacity Beijing, selected 9 indicators Sandstorm Resistance Ability (SRA) model Beijing; Then, Main Component Analysis used calculate SRA Beijing over years, improved year by year. At same time, constructed (SI) indicate annual severity dust storms relativity between SI Pearson Correlation find correlation coefficient these -0.833, as significant correlation. This show that Saihanba's resistance effectively reduces Beijing.