| 1 | The study of the continuation in Qianxi was selected as a study case. | |
| 2 | According to the conversion of farmland to forest, Qianxi County becomes sustainable development of ecology, economy and society. | |
| 3 | Taking Qianxi County as a study case, the sustainability of conversion of farmland to forest was studied by using the data from farmer household survey. | |
| 4 | 以河北省迁西县为例，提出了选取生态环境干扰度指标因子的原则，进行了干扰度指标因子的分级及赋值，并应用灰色关联度分析确定指标因子的权重。 Taking Qianxi county, Hebei province, for example, we put forward the principles to select influencing factors, then graded, evaluated them and fixed on their weight by grey system analysis. |
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