玉米冠层凝露的观测与模拟  

THE OBSERVATION AND SIMULATION OF DEW FORMATION OVER MAIZE CANOPY

作　　者：陆佩玲[1] 任保华[2] 于强[3] 

机构地区：[1]北京林业大学森林资源与环境学院 [2]中国科技大学地球与空间科学系 [3]中国科学院地理研究所禹城试验站

出　　处：《生态学报》1998年第6期615-620,共6页Acta Ecologica Sinica

基　　金：国家自然科学基金"九五"重大资助

摘　　要：对模拟植物冠层温度的能量平衡单层模型进行了某些方法上的改进。并使用实测小气候资料，用数值方法，模拟了玉米冠层顶部的温度，模拟结果与实测的冠层温度相符合。利用冠层温度下的饱和水汽压估算了玉米冠层顶部结露的持续时间和结露量。结果表明：在中纬度低平原地区秋季的晴天，大约下午１７００开始结露，清晨６００～７００结束，结露的持续时间约１３～１４ｈ。露形成的时间进程为开始和结束急剧，中间维持稳定，呈倒“Ｕ”字。结露速率在０．０５～０．０７ｇｍ－２ｓ－１。A single layer model to simulate plant canopy temperature in basis on energy budget approach,is improved in this research.The temperature of the upper canopy is estimated from microclimatic data by the numerical method.The temperatures simulated by this model fit the observed values well.The duration of dew formation and the amount of dew are estimated by predicting the time when the temperature of upper leaves falls below the dew point.The results show that dew occurs at about 17∶00,and ends at about 6∶00 or 7∶00 in the morning next day on a fine day in the autumn at the middle and low altitudes in China.The duration of dew formation is about 13～14 hours.The rate of dewfall is stable throughout the main time of dew formation.However,during the first and last 30 minutes of dew formation time,the dewfall changes rather rapidly.The course of dewfall has a shope of a reversed “U”.The rate of dewfall is about 0 05～0 07gm -2 s -1 .

关 键 词：玉米 冠层温度 露 模拟 

分 类 号：S513.01[农业科学—作物学] P426.321[天文地球—大气科学及气象学]