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Effect of foehn on nighttime sap flow of soybean

机译：foehn对大豆夜间汁液流动的影响。

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Foehn winds cause damage known as white head injury to paddy rice; and this damage is more severe at night than during the day. However, little has been reported about the nighttime effects of the foehn on other crops. We investigated the foehn's effects on soybean plants, and compared day- and nighttime responses. We measured sap flow, which is assumed to equal transpiration, by the heat balance method. The gauge conductance of sap flow sensors during the nighttime foehn was calibrated against values obtained in the pre- or post-foehn period. Stomatal conductance was calculated using sap flow data and meteorological data. At night, sap flow during foehns was greater than that in non-foehn conditions. During the foehns in 2007 and 2008, average nighttime sap flows were 4.3 g h~(-1)(2007) and 4.0 g h~(-1) (2008). The cumulative sap flow through the night during the foehns in 2007 and 2008 were10.5% and 7.0% of tneir respective daytime values. In 2007, sap flow increased linearly with increasing vapor pressure deficit (D_a) when D_a exceeded 0.7 kPa. In 2008, however, sap flow increased rapidly when D_a exceeded 0.8 kPa. These different responses of sap flow to D_a in 2007 and 2008 were attributed to differences in regulation of stomatal conductance, which was low in 2007 but varied markedly in 2008. The reason for these differences may be the different soil moisture conditions in 2007 and 2008.
机译：Foehn风对水稻造成损害，被称为白头病。这种损害在晚上比白天更严重。然而，关于敌对作物对其他农作物夜间影响的报道很少。我们调查了福恩对大豆植物的影响，并比较了白天和晚上的反应。我们通过热平衡法测量了被认为与蒸腾相等的树液流量。相对于在喷水前或喷水后时期获得的值，对夜间foehn期间液流传感器的电导率进行了校准。使用树液流量数据和气象数据计算气孔导度。在晚上，泡沫期间的汁液流量大于非泡沫状态下的汁液流量。在2007年和2008年的夜间，平均夜间树液流量为4.3 g h〜（-1）（2007）和4.0 g h〜（-1）（2008）。在2007年和2008年的夜间，整个晚上的累积树液流量分别为白天白昼值的10.5％和7.0％。 2007年，当D_a超过0.7 kPa时，液流随蒸汽压亏缺（D_a）的增加而线性增加。然而，在2008年，当D_a超过0.8 kPa时，汁液流量迅速增加。液流对D_a的不同响应是由于2007年气孔导度调节差异较小，2007年较低，但2008年变化显着。造成这些差异的原因可能是2007年和2008年土壤湿度不同。

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