冬小麦蒸腾速率在不同土壤水分条件下的修正

Modified Coefficients of Transpiration Rates Responding to Different Soil Moisture Treatments

为找到不同土壤含水量对蒸腾速率的影响程度,通过对LI-6200便携式作物生理测定仪在不同土壤水分处理下的蒸腾速率观测值与气象条件计算得出的理论值进行比较,确定不同土壤水分条件下的蒸腾速率修正系数。分析发现:①在不同的土壤含水量下,未考虑修正系数的情况时,土壤含水量越小,理论计算误差越大;土壤含水量越大,理论计算误差越小。②土壤含水量小时蒸腾速率计算值的修正系数大,而土壤含水量偏大时修正系数小。③考虑修正系数后,计算误差显著减小,除了土壤含水量为14.89%稍有偏差外,其它土壤含水量状态下的理论计算值非常接近实际观测值。同时验证了不同土壤水分下的修正系数是显著的。

For identifying the influences of soil moisture on transpiration rate, comparison between calculated and observed transpiration rates, responding to different soil moisture treatment, is carried out. The results show： （1） the calculation errors of transpiration rate in scarce water supply are higher than those in sufficient water supply; （2） the modified coefficients of transpiration rate are higher in scarce water supply than in sufficient water supply; （3） the calculation errors of transpiration rate decrease sharply after the modified coefficient taking into account. Meanwhile, the modified coefficient is statistically significant.