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茶园排水系统除主排水沟外,还必需有与主沟配套的田间排水沟,才能使茶园的地下水位在大雨后一日内降到70厘米以下,保证茶树生长良好和达到较高的产量水平。为此作者分别在茶园地下水给排平衡(日地下水补给速率与排出速率均为20毫米)和给排不平衡(日排水速率为20毫米)两种条件下,试验测定了使两条田间排水沟之间中点位置的地下水位,在一日内分别由60厘米降到70厘米(标准一),75厘米降到85厘米(标准二)和90
In addition to the main drainage system of the tea plantation drainage system, there must also be a field drainage ditch which is matched with the main ditch to reduce the water table of the tea plant below 70 cm in the first day after heavy rain, so as to ensure that the tea tree grows well and reaches a higher output level. To this end, the author respectively in the tea plantation groundwater supply and drainage balance (daily groundwater recharge rate and discharge rate of 20 mm) and the supply and discharge imbalance (daily drainage rate of 20 mm) two conditions, the test measured two field drainage The groundwater level at the midpoint between the two locations dropped from 60 centimeters to 70 centimeters (standard one), 75 centimeters to 85 centimeters (standard two) and 90