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地下水是农田水分存在的一种形式,它与地面水和土壤水有直接联系,可以互相转化.对于农艺要求来说,重要的是能利用这种转化,调节、控制地下水位的升降,保持作物所需要的适宜地下水埋深.如果地下水位过高,由于上升毛细管水的补给作用,就可能引起土壤沼泽化、盐渍化,土壤氧化还原电位的降低和空气含量不足.由于水的比热大(是空气的3300倍,干土比热的4～5倍),土壤水分过
Groundwater is a form of cropland moisture that is directly linked to surface water and soil water and can transform into one another.It is important for agronomic requirements that this transformation be used to regulate and control the movements of the groundwater table and to maintain the crop If the groundwater level is too high, it may lead to soil swamping, salinization, reduction of redox potential of the soil and insufficient air content due to the recharge effect of the rising capillary water.As the water has a large specific heat (3300 times the air, 4 to 5 times more than the heat of dry soil), soil moisture over