3.5. Ecological characteristics of distribution areas
The relationship between main environmental factors and potential distribution areas is shown in Table 5. Under the three climate scenarios of ssp126, ssp245, and ssp585, the suitability of L. japonicus in the 2050s and 2090s was lower than that in the current period, and the decrease was greater than 0.1. Under the ssp585 scenario, the decrease in the 2090s was 0.25. In the ssp126 climate scenario, the suitability of 2090s was increased compared with the 2050s, and the growth rate was 0.01.
The minimum temperature of the coldest month and the precipitation of the wettest month of the 489 distribution points of L. japonicuswere opposite to the changes in habitat suitability of L. japonicus. In the two periods of 2050s and 2090s, the three scenarios of ssp126, ssp245, and ssp585 showed increasing trends.
The maximum temperature of the hottest month in 489 distribution sites increased by 8.9%, 8.5%, and 10.8% in the 2050s under ssp126, ssp245, and ssp585, respectively. The warmest month maximum temperatures in the 2090s under ssp245 and ssp585 scenarios increased by 3.5% and 8.8%, respectively, compared to those in the 2050s.
The driest month precipitation of 489 Leonurus artemisiadistribution points showed a downward trend in the 2050s and 2090s under the three scenarios of ssp126, ssp245, and ssp585.
Table 5 Results of the analysis of major environmental variables