在极端干旱年份，柠宁灌木林地的土壤水分循环水平很低（３．０５％），降水年渗深极浅（３０ｃｍ），水分亏缺程度最为严重（－８９．５１ｍｍ）；在极端丰水年份，则土壤水分循环水平最高（４．８８％），降水年渗深最大（３１０ｃｍ），水分收支盈余额极其可观（＋１９５．０９ｍｍ）。极端丰水条件非常有利于土壤水分亏缺的补偿和恢复。在此条件下，柠条灌木林地的土壤干层在入渗层（３１０ｃｍ）以上消失，河北杨林和小叶杨林地的土壤干层可完全消失。 In extremely dry years, the soil moisture cycling in the Ningxia shrubland was very low (3.05%), the depth of infiltration was very shallow (30cm), and the water deficit was the most serious (-89.51mm) In the year, the highest soil water cycle (4.88%), the deepest infiltration (310cm) in the precipitation year and the balance of water surplus and surplus were extremely impressive (+ 195.09mm). Extreme water conditions are very conducive to the compensation and recovery of soil water deficit. Under this condition, the soil dry layer of Caragana korshinskii woodland disappeared above the infiltration layer (310 cm), and the dry layer of soil in the forest of Yanglin and Populus simonii in Hebei Province disappeared completely.