Shift of suitable habitat in Future
Range of species would shift with climate change, which had been demonstrated by a larger number of observation and simulating studies on species distribution(Bellard, Bertelsmeier, Leadley, Thuiller, & Courchamp, 2012; Urban, 2015). Medicinal plants, as an important class of resource plants, were always the first target of species distribution modeling. According to previous studies, high suitable habitat of some species would shrink, even disappear, others would increase, and still others would remain stable in the future. Kurpis(Kurpis, Serrato-Cruz, & Feria Arroyo, 2019), Zhao(Zhao et al., 2020) and Xie(Xie et al., 2018) found the potential distribution of Tagetes lucida Cav. (Asteraceae), Notopterygium incisum Ting ex H. T. Chang (Apiaceae) and Eriocaulon buergerianum Körnicke. (Eriocaulaceae) would decrease respectively in the future. Asase(Asase & Peterson, 2019) considered that the high suitable habitat of Alstonia boonei De Wild (Apocynaceae) would be stable under future climate scenarios. Kunwar(Kunwar et al., 2020) pointed out that there would be more high suitable habitat for Dactylorhiza hatagirea (D. Don) Soo (Orchidaceae) in the future. Shen(Shen et al., 2019) indicated that adaptive cultivation regions for Panax quinquefolius L. (Araliaceae) would expand by 9.16%–30.97% in 2070s. In our study, the projections revealed that ranges of A. annua would change dramatically in the future, its area of high suitable habitats would decline in all mentioned periods and climate scenarios.