中国旅游业绿色发展效率时空演变特征及影响机理
刘雨婧, 唐健雄

Spatio-temporal evolution characteristics and influencing mechanism of green development efficiency of tourism industry in China
LIU Yu-jing, TANG Jian-xiong
图5 2008—2018年中国旅游业绿色发展效率核密度估计
Fig. 5 The kernel density estimation of TGDE in China from 2008 to 2018