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应用Granier热扩散探针(TDP)对辽西农林复合系统中杨树的树干液流速率进行连续观测,并同步观测微气象因子.将杨树液流速率与对应的空气温度、空气湿度、净辐射和饱和水汽压差数据进行逐行错位分析,探讨晴天下杨树树干液流速率与气象因子之间的时滞效应.结果表明:杨树的液流速率提前于空气温度、空气湿度和饱和水汽压差,而滞后于净辐射;6—9月,杨树液流速率分别提前于空气温度70、30、50、90min,空气湿度80、40、40、90min,饱和水汽压差90、50、70、120min;而滞后于净辐射10、10、40、40min.对综合气象影响因子与杨树液流速率进行回归分析,包含与不包含时滞效应的相关度均达到极显著水平,决定系数分别为0.903和0.885,包含时滞效应的决定系数提高了2.04%,从而提高了液流速率数值模拟的精度.
Using the Granier thermal diffusion probe (TDP), the sap flow velocity of poplar trees in the agroforestry system in western Liaoning was continuously observed and the meteorological factors were observed synchronously.The poplar flow rate was correlated with the corresponding air temperature, air humidity, net radiation And staggered displacement of saturated vapor pressure difference data to explore the lag effect between the flow velocity of the poplar tree trunk and meteorological factor under sunny day.The results show that the flow velocity of poplar is ahead of the air temperature, air humidity and saturated water vapor Pressure drop, but lagged behind the net radiation. From June to September, the poplar flow rate was earlier than the air temperature 70, 30, 50, 90 min, air humidity 80, 40, 40, 90 min, saturated vapor pressure 90, 70,120min, but lagged behind the net radiation at 10, 10, 40 and 40min. Regression analysis of the comprehensive meteorological factors and the poplar flow rate showed that the correlations between the inclusion and non-lag effects reached extremely significant levels, and the coefficient of determination Respectively, 0.903 and 0.885, and the coefficient of determination including the time lag effect increased by 2.04%, thereby improving the accuracy of the numerical simulation of the liquid flow rate.