摘要
在北方地区玻璃温室内,观测黄瓜生长期叶温与温室内微气象因子,利用基于能量平衡方程和水汽扩散理论的叶-气温差方程计算植株气孔阻力(r i),结合同期气候阻力(r*)和边界层阻力(re)进行分析,结果发现:不同天气条件下r i/re的比值与r*/re比值之间呈极显著正相关关系,晴天时:r i/re=1.207(r*/re)-0.326(n=328,r=0.8055),阴天时:r i/re=0.169(r*/re)+0.278(n=222,r=0.8076)。根据此拟合方程,以r*/re代替r i/re代入修正后的P-M公式中计算温室黄瓜的蒸腾速率,与直接代入r i值的计算结果比较,结果晴天与阴天条件下的相对误差均<10%,一致性指数达0.96以上,说明利用拟合方程建立的模型模拟效果很好。此模型能够直接利用气象数据计算温室作物气孔阻力并进而计算蒸腾速率,使温室作物蒸腾速率的计算更简单方便,该文结果对同类温室和作物有参考价值。
By using the To-Ta model（To and Ta represent leaf temperature and air temperature respectively） based on energy balance equation and vapor diffusive theory, the stomata diffusive resistance （ri） on sunny and cloudys days was respectively calculated according to continuously monitoring the leaf temperature, air temperature, air humidity, and radiation in the greenhouse in northern China. The climatic resistance （r^＊） was calculated based on the microelimatic data and the laminar boundary layer resistance was measured too. The analysis result showed that the positive relationship was remarkable between the ri/re and r＊/re, i. e. ri/re = 1. 207r^＊/re -0. 326（n = 328, r =0. 8055） on sunny days and ri/re= 0.169r^＊/re ＋ 0. 278（n = 222, r = 0. 8076） on overcast days. Then the transpiration rate （AE2） was estimated by substituting r^＊/re for ri/re in modified P-M model, compared with the transpiration rate （λE1） which was estimated directly by ri in the sdme model, the identity index was very high （0. 96） on both sunny days and overcast days. So it concluded that these relationships between ri/re and r^＊/re could be used to simulate the transpiration rate of greenhouse cucumber in the northern China.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2006年第9期176-179,共4页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金(30170538)
国家"863"项目(2001AA247042)
关键词
温室黄瓜
蒸腾速率
模拟
气候阻力
greenhouse
transpiration rate
simulation
climatic resistance
