Potential distribution
A. annua is an annual plant. Its native habitat was located in
Asia, most likely in China. Now, it grew in every continent except
Antarctic (Ferreira, Laughlin, Delabays, & de Magalhães, 2005).
Accompany with development of cultivating techniques and growing demand
of raw material for extracting artemisinin, it had been introduced in
for experimental cultivation or adopted for breeding in non-native
habitats(Ferreira et al., 2005; Woerdenbag et al., 1994). The simulation
showed its high suitable habitat was located in many countries, such as
USA, Brazil, Argentina, Australia, Malaysia, Vietnam, Thailand, Japan,
Korea, India, Ukraine, Poland, Czech, Slovenia, Hungary, Romania,
Austria, Italy, Sweden, German, France, UK, Madagascar, Tanzania, South
Africa and so on(Laughlin, Heazlewood, & Beattie, 2002). It was in
consistent with the distribution of its occurrence records. Compared
with other similar studies, it showed that our simulation basically
coincided with others(Qin, Jian, Jie, Chengzhong, & Caixiang, 2018;
Wang, Li, Zeng, & Xie, 2015). But it was obvious that the high suitable
habitat area in their study was bigger than that in ours(Ding et al.,
2020). This may be caused by different quantity of adopted algorithms
and occurrence records. Only boosted regression tree (BRT) was used in
their research. The uncertainty of single model was unavoidable in that
situation.