Table 2. Correlation between chemical components in A. annua and ecological factors.

Ecological factor	Arteannuin B	Artemisinic acid	Artemisinin	Scopoletin
Longitude (°E)	0.323**	0.285**	−0.239**	-
Latitude (°N)	0.147*	-	−0.681**	−0.513**
Altitude (m)	−0.387**	−0.323**	-	−0.176**
Radiation dose	-	.061*	−.145**	−.120**
Rainfall	−.113**	−.279**	.522**	.349**
Humidity	.059*	-	.646**	.383**
Temperature	−.078**	−.273**	.406**	.251**
Sunshine hours	−0.268**	0.082**	−0.156**	−0.085**
Annual frost-free period	−0.063*	0.651**	-	0.365**

**: Correlation is significant at the 0.01 level

*: Correlation is significant at the 0.05 level.