小麦田间结露研究

Dewfall in Wheat Fields

依据４年小麦田间结露研究及农田小气候观测资料，确定了陕西省杨陵区二道塬麦田２／３株高处露的形成和消失条件分别为周围空气相对湿度≥９１％及≤８９％；分析了麦田露形成、消失和持续时间的垂直分布规律。４月中旬～５月下旬麦田２／３株高处的露时平均为１２．７７～１３．６４ｈ，最长达１５．８４ｈ；露量平均为０．０７～０．１０ｍｍ，最大达０．１８ｍｍ．

Based on the 4 years′study of dewfall in wheat fields and the observedand determined data of farmland microclimate,this paper analysis the conditions of dewcondensation and disappearance at the 2/3 plant height of wheat in wheat fields on thesecond tableland of Yangling District of Shaanxi Province,i.e,they are over or equal to91%and less than or equal to 89%of the relative humidity in the ambient air respective-ly. Also,this paper analyses the vertical distribution law of time for dew condensation,disappearance and duration.The mean dew duration is 12.77～13.64 h;the longest dewduration is l5.84 h;the mean quantity of dew is 0.07～0.11 mm;and the maximum dewis 0.18 mm at the2/3 plant height of wheat in wheat fields from the second decade ofApril to the third decade of Ma