The realized-niche breadths of the plants closely relate to the annual rainfalls and soil moisture and are the dominating factor among the other factors such as landforms, soil nutrient and particles.

• 植物的现实生态位宽度与年际降水量关系密切，在地貌、土壤颗粒、土壤水分、土壤养分等影响因子中，土壤水分是主导因子。