土壤是植物群落演替过程中重要的环境因子，是生态系统功能恢复与维持的关键指标。
Soil, which is the vital important environment factor during plant succession, is the key index of function recovery and maintain of the eco-system.
该方法指标评定旱级时综合考虑气候-土壤-植物体系和各时段旱象对整个作物旱情的影响程度。
This method comprehensively considers the air-soil-plant system and the magnitude of impact drought event in each interval on the whole drought event to determine the drought level.
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