STUDIES ON HEAT STORAGE OF PLANT CANOPY DUE TO THE VARIABILITY OF AIR AND SOIL TEMPERATURES.

空气和土壤温度变化引起的植物冠层蓄热研究。

基本信息

批准号：
06660322
负责人：
KON Hisashi
金额：
$ 1.28万
依托单位：
CHIBA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Heat storage and temperature of plant canopy is an important factor for plant growth, heat budget and remote sensing. The purpose of this research is to make clear some subjects with respect to the heat storage of plant canopy or temperature of plant. The first subject is the influence of soil heat flux under plant canopy. The second one is the comparison of plant temperature with a few models and the third one is the comparison of the observed leaf temperature with model.About the first subject, the following result was obtained. Under row plant canopy, there are large differences of the soil heat fluxes according to the positions. The soil heat flux observed in the interrow space may be two fold of the mean value under canopy. As the difference occurs systematically, it is not able to neglect in the analysis of heat budget.On the second, the estimation of the heat storage was tried by the following three models ; model using heat budget equation and gradient method, one layr model of plant canopy and a simplified multi-layr model. As the results, the one layr model was good in spite of the simple calculation method. The first model showed the large variation in every observed time. The last model has shortcomings of complicated calculation.On the third, observed leaf temperature was estimated by one layr model using the empirical parameters although it is difficult to identify the evaporation efficiency and the bulk transfer coefficient. Leaf temperatures obtained by multi-layr model were smaller than the observed one. It seems that the difference between the row plant canopy of the field and the uniform canopy in the theory chages the patterns of transmission of solar radiation in the canopy.

植物冠层的热量储存和温度是植物生长，热预算和遥感的重要因素。这项研究的目的是就植物冠层或植物温度的热量存储清楚地表明一些受试者。第一个主题是植物冠层下土壤热通量的影响。第二个是将植物温度与几个模型的比较，第三个是将观察到的叶温度与模型的比较。在行植物冠层下，根据位置存在很大的土壤热通量差异。在Interw空间中观察到的土壤热通量可能是冠层下平均值的两个倍。由于差异是系统地发生的，因此在热预算的分析中无法忽略。使用热预算方程和梯度方法的模型，一种植物冠层的Layr模型和简化的多层模型。结果，尽管有简单的计算方法，但一个Layr模型还是很好的。第一个模型在每个观察到的时间中都显示出较大的变化。最后一个模型具有复杂的计算的缺点。在第三个观察到的叶温度是通过一个Layr模型使用经验参数估算的，尽管很难识别蒸发效率和大量转移系数。通过多路线模型获得的叶片温度小于观察到的叶片温度。看来，理论中的田间行冠层与均匀冠层之间的差异搅动了冠层太阳辐射的传播模式。