太湖流域分省市水环境政策量化分析与比较
杨明一, 乔海娟, 王银堂, 胡庆芳, 张丛林

Quantitative analysis and comparative study on provincial water environment policies in the Tai Lake Basin
YANG Mingyi, QIAO Haijuan, WANG Yintang, HU Qingfang, ZHANG Conglin
图3 1993—2020年政策发文量
Figure 3 The number of issued policies, 1993-2020