3.4 Changes in the suitable areas of T. chinense under future climatic conditions
Figure S2 and S3 showed the spatial distribution pattern and area change of suitable areas at each level of the complete ecological niche ofT. chinense under future climate conditions. In China, the suitable areas will still be mainly distributed in the eastern and southern of China under future climatic conditions. As climate warming intensifies (increase of year and carbon emissions), the suitable areas will gradually expand to the northern part of the current suitable range and Tibet, and only slightly decrease in the southern part of the suitable areas (Figure 5A). Under future climate change, it is expected that T. chinense will move towards higher altitude and higher latitude areas in China (Figure 5B). Compared with the current distribution of suitable areas, the total area of suitable areas ofT. chinense in China will increase year by year with the increase of carbon emissions, and the total area of T. chinense will expand to the maximum (557.82 * 104 km2) under the climate scenario of 2050s-SSP3-7.0 (Figure 6). In all levels of suitable areas, the areas of high suitable areas show a decreasing trend, while the areas of low suitable areas and medium suitable areas show an increasing trend. Moreover, the degree of change is gradually obvious with the increase of year and carbon emissions. In the 2090s-SSP5-8.5, the area of high suitable areas is reduced to the smallest, which decreases by 36.76% compared with the current situation. Under the 2090s-SSP5-8.5 scenario, the area of low suitable areas expands to the largest, about 159.95 * 104 km2.