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基于涡度相关仪的南方玉米冠层阻力模型比较研究

发表时间:2018-05-15  浏览量:711  下载量:76
全部作者: 何田田,许小燕
作者单位: 合肥工业大学土木与水利工程学院;合肥工业大学建筑工程系
摘 要: 模拟作物蒸发蒸腾量(evapotranspiration,ET)的精度对节水农业的发展至关重要,而冠层阻力(canopy resistance,rc)是ET估算模型中的关键参数,对农业高效用水的意义重大。为提高估算南方玉米ET的精度,现进行冠层阻力模型优选研究。田间试验于2016年至2017年在合肥工业大学宣城校区试验地进行,采用涡度相关系统观测气象参数、土壤参数及ET. 以实测资料为基准,采用双源Shuttleworth-Wallace蒸发蒸腾模型(S-W 模型)估算ET,分别利用Katerji & Perrier 临界冠层阻力模型、Ortega-Farias气候阻力-土壤水分综合模型及Jarvis多因子阶乘阻力模型等3个冠层阻力模型与土壤阻力模型进行耦合,建立3个新的耦合阻力模型,并对比分析这3个模型模拟不同情况下的ET值。结果显示,在晴天和阴天2种天气情况下,ET日变化模拟值与实测值的相关系数均为Jarvis多因子阶乘模型>临界冠层阻力模型>气候阻力模型,晴天的相关系数略高于阴天。另外,误差分析显示,Jarvis多因子阶乘模型<临界冠层阻力模型<气候阻力模型。因此,Jarvis多因子阶乘模型耦合的计算精度优于其他2种方法,能够较好地反映该地区玉米ET及其变化趋势,是最适合当地玉米ET的冠层阻力模型,但该模型所需参数较多、计算复杂,在实测数据有限的情况下,可以优先考虑利用临界冠层阻力模型进行耦合计算。
关 键 词: 农业工程;涡度相关;冠层阻力;蒸发蒸腾量;南方玉米
Title: The preferred study of canopy resistance model of southern corn based on vorticity correlation instrument
Author: HE Tiantian, XU Xiaoyan
Organization: School of Civil and Hydraulic Engineering, Hefei University of Technology; Department of Structure Engineering, Hefei University of Technology
Abstract: The accuracy of crop evapotranspiration (ET) simulation is very important for the development of water-saving agriculture, canopy resistance (rc) is the key parameter of ET estimated model, and it is of great significance to agricultural efficient water using. In order to improve the accuracy of the southern crop ET simulation, the preferred study of canopy resistance model is going on. Field experiments are carried out at Xuancheng campus of Hefei University of Technology in 2016-2017, observing meteorological parameters, soil parameters and ET by vorticity correlation system. Based on the measured data, the experiments estimate ET by two-source Shuttleworth-Wallace evapotranspiration model (S-W model). The research compares and analyzes the ET figures of the three new coupled resistance model respectively under different circumstances. The three new coupled resistance models are built according to Katerji & Perrier critical canopy resistance model, Ortega-Farias climate resistance-integrated model of soil moisture, Jarvis multi-factor factorial resistance model. The results indicate that no matter it is sunny or cloudy, the correlation coefficient sequence of ET simulated values and measured values is Jarvis multi-factor factorial resistance model>critical canopy resistance model>climate resistance-integrated model. The correlation coefficient of sunny day is slightly higher than that of cloudy day. At the same time, the error analysis is also calculated in this paper. The results indicate that Jarvis multi-factor factorial resistance model
Key words: agricultural engineering; vorticity correlation; canopy resistance; evapotranspiration; southern corn
发表期数: 2018年5月第9期
引用格式: 何田田,许小燕. 基于涡度相关仪的南方玉米冠层阻力模型比较研究[J]. 中国科技论文在线精品论文,2018,11(9):905-915.
 
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