摘要
为了观测柑橘树的日蒸腾规律并进行数值模拟,通过室外试验,研究了盆栽柑橘树的蒸腾规律与气象因子之间的相关关系,并根据气象因子和叶面积指数,对Penman-Monteith模型中的冠层表面阻抗进行修正,采用修正后的Penman-Monteith模型模拟了盆栽柑橘树的蒸腾过程。结果表明,1柑橘树的蒸腾速率在1天内呈单峰变化,在每日14:00左右达到峰值;2气象因子对于蒸腾速率的相关性,按由大到小依次为环境温度、太阳净辐射、风速、相对湿度,其中相对湿度与蒸腾速率负相关;3使用修正后Penman-Monteith模型模拟盆栽柑橘树的蒸腾强度时,2014年6月10—16日、2014年10月5—11日、2015年5月27—30日、2015年6月7—10日的模拟值与茎流计实测值的相关系数r分别为0.901 5、0.867 1、0.943 1、0.946 3。修正后的Penman-Monteith模型在模拟盆栽柑橘树蒸腾速率时,具有较高的准确性,且6月份的模拟精度高于11月份。
The outdoors potted citrus tree was used as the research object to observe the daily transpiration law and conduct numerical simulation.The relationship between meteorological factors and citrus trees transpiration rate was analyzed through outdoor experiment.The canopy surface impedance of PenmanMonteith model was modified by meteorological factors and leaf area index.The modified PenmanMonteith model was used to simulate the transpiration process of the potted citrus tree.The results indicated that1 the daily transpiration rate of citrus tree showed a single peak change,and transpiration rate reached peak value at 14：00.2The correlation of meteorological factors on transpiration rate large to small was the environment temperature,the solar net radiation,the wind speed,and the relative humidity.The relationship between transpiration rate and relative humidity showed a negative correlation.3Using the modified Penman Monteith model to simulate transpiration rate of potted citrus tree and comparing simulated value with estimated value,it was found that,during 2014/06/10-16,2014/11/04-11,2015/05/27-30,and 2015/06/07-10,the correlation coefficients were 0.901 5,0.867 1,0.943 1,0.946 3.Application of modified Penman Monteith model in transpiration rate of potted citrus tree had a high accuracy,and the accuracy of June was higher than that of November.
出处
《灌溉排水学报》
CSCD
北大核心
2016年第4期98-104,共7页
Journal of Irrigation and Drainage
基金
国家自然科学基金项目(40701024)
