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MATLAB温室作物蒸腾作用建模与试验

时间:2022-11-23 21:26来源:毕业论文
介绍Penman-Monteith公式,将以其为基础的三个典型模型使用MATLAB软件进行模拟仿真,并对数据图表化
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摘要在非某植物适宜生长的季节或不适宜种植的地区,温室能供给其温室生育期和提高其产量,因此常用于低温季节时需种植的喜温蔬菜、花卉、林木等植物栽培或育苗。由于温室封闭与半封闭的特点,能够全年高效优质的生产。与此同时,该特点也导致在温室条件下作物蒸腾量和大田作物大相径庭。蒸腾作用对温室环境产生影响,而温室环境的改变又反作用于作物的生长。因此,建立更好的温室条件下作物蒸腾的模型,准确估算作物蒸腾量,对于作物汲水灌溉的设计等温室操作都有至关重要的参考作用。86206

本文包括以下内容:

1)对温室条件下的蒸腾作用的相关知识进行介绍,概括国内外研究现状,对温室条件下的典型蒸腾模型分类简单介绍。

2)具体介绍Penman-Monteith公式,将以其为基础的三个典型模型使用MATLAB软件进行模拟仿真,并对数据图表化。

3)采用实验方式获得江温室气象数据,以此为数据源代入模型中进行仿真,将以Penman-Monteith公式为基础的机理模型设为标准对比,结果进行误差分析,显示基于FAO系数法模型较经验模型更为准确。

毕业论文关键词:温室;蒸腾作用;Penman-Monteith公式;MATLAB;估算模型

Abstract  Greenhouse is not suitable for plant growth in the season or region, can provide the growth period and increase the yield of the greenhouse, so more for low temperature seasons like warm vegetables, flowers, trees and other plant cultivation or breeding。 Due to its closed and semi closed characteristics, the annual production of high quality and high efficiency。 At the same time, it also resulted in the greenhouse conditions of crop transpiration and field crops widely pergent。 Transpiration effect on the environment of the greenhouse, and the change of the environment of the greenhouse effect on the growth of the crop。 Therefore, the establishment of the models of crop transpiration under greenhouse conditions better, the accurate estimation of crop evapotranspiration and the crop water irrigation design greenhouse operations have a crucial reference。

    This paper includes the following contents:

    1) to introduce the relevant knowledge of transpiration under the condition of greenhouse, summarize the research status at home and abroad, and briefly introduce the classification of the typical transpiration model under the condition of greenhouse。

    2) the Penman-Monteith formula is introduced in detail, and the MATLAB software is used to simulate the three typical models。

    3) using the obtained Jiangsu University greenhouse meteorological data, taking the opportunity of substitution model in data source simulation, will be with the penman Monteith equation for mechanism model based design for the standard of comparison。 The results of the error analysis, display based on FAO coefficient method is compared to empirical model is more accurate。

Key words: greenhouse;Transpiration;Penman Monteith model;MATLAB;To estimate the model

主要符号说明

T 作物冠层蒸腾量,mm/d λ 水的汽化潜热,MJ/kg

Rnl 作物冠层截留的净辐射,MJ/(m2·d) G 土壤热通量,MJ/(m2·d),

ea

冠层温度下饱和水汽压,kPa ed 实际水汽压,kPa

Δ 饱和水汽压-温度曲线斜率,kPa/℃;

MATLAB温室作物蒸腾作用建模与试验:http://www.youerw.com/zidonghua/lunwen_102398.html
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