Root vigor was affected not only by the degree of soil drought but also by the duration of soil moisture.
苗木根系活力除了受土壤干旱协迫程度的影响之外，还受到干旱持续时间的影响。
2
The impact of drought climate has the characteristics of long duration, wide range and severe disaster degree.
干旱气候的影响具有持续时间长、范围广、灾害程度重的特点，而干旱指标是衡量干旱气候的标准。
3
The results indicated that: the dry material accumulation quantity and filling duration under full irrigation were higher than that of drought condition;