论文部分内容阅读
本文介绍了中国科学院禹城综合试验站自1986—1988年所进行的农田蒸发联合观测试验。试验分别在小麦、大豆、玉米和棉花田上进行,包括以下内容:1.蒸发器测量(Lysimeter);2.波文比一能量平衡法(BREB);3.空气动力学阻抗—能量平衡综合法;4.多层梯度法;5.大田水量平衡和零通量面法;6.植物生理测定技术;7.遥感技术等。试验结果为:1.BREB方法计算的蒸发量比Lysimeter的测量值偏低约20％,产生偏差的原因:(1)公式中各参数的测量误差;(2)公式
This paper presents a joint observation experiment of farmland evaporation conducted by Yucheng Comprehensive Experimental Station of Chinese Academy of Sciences from 1986 to 1988. The experiments were conducted on wheat, soybean, maize and cotton fields, respectively, and included the following: 1. Lysimeter 2. BREB 3. Aerodynamic impedance-energy balance synthesis ; 4. Multi-gradient method; 5. Field water balance and zero-flux surface method; 6. Plant physiological measurement techniques; 7. Remote sensing technology. The experimental results are as follows: 1. The reason why the evaporation calculated by BREB method is about 20% lower than the measured value of Lysimeter is as follows: (1) The measurement error of each parameter in the formula; (2)