“…As mentioned in Section 3, the elevation, ground slope, aspects, and soil type were used as the classification layers for the construction of similar habitats in this study. Because vegetation restoration is usually considered only in the area where the slope is above 15° in China's Sloping Land Conversion Program [Grain for Green (GFG); Liu & Lan, ] and it is almost impossible to perform GFG in area less than 6°, the area below 6° in this study was masked from the study area. As a result, the terrain slope map was finally divided into a fourâclass layer, that is, 6â15° ( V 1 = 1), 15â20° ( V 1 = 2), 20â25° ( V 1 = 3), and 25° and above ( V 1 = 4); the variable of the slope aspect was divided into an eightâcategory layer, that is, the east ( V 2 = 1), the southeast ( V 2 = 2), the south ( V 2 = 3), the southwest ( V 2 = 4), the west ( V 2 = 5), the northwest ( V 2 = 6), the north ( V 2 = 7), and the northeast ( V 2 = 8); there are 72 types of soils involved in the study area, which means that the soil type variable takes 72 distinct values; in addition, we classified the elevations by equal interval method, and the study area was divided into 180 types of elevation intervals.…”