变量

直接效应

间接效应

总效应

Land_zpg

0.098** (0.047)

1.041* (0.54)

1.139** (0.557)

Land_x

0.101*** (0.021)

0.477** (0.238)

0.578** (0.243)

gdp

−0.513*** (0.146)

−2.442 (1.852)

−2.955 (1.884)

str

0.538*** (0.183)

6.246*** (2.323)

6.784*** (2.445)

urban

0.894*** (0.231)

−4.948* (2.656)

−4.054 (2.707)