干旱区枣树蒸腾规律及其与气象要素的关系

为了研究枣树蒸腾耗水规律及其与气象因子之间的关系,采用包裹式茎流计采集数据,并结合小型自动气象站同步测得的气象数据,分析枣树蒸腾速率的日变化规律及其与气象要素之间的关系。结果表明:不同的天气类型之间,蒸腾速率的日变化规律存在显著差异,晴天天气,蒸腾速率曲线表现为单峰曲线趋势,且蒸腾速率在2 000 g/h以上的持续时间较长,阴天与雨天天气蒸腾速率相对较小,且蒸腾速率曲线多呈多峰曲线形式。蒸腾日际变化表现为从5月份开始逐渐升高,6、7月份达到一年中的最大值,而后逐渐降低。空气温度Ta、相对湿度RH、太阳辐射Rn及降雨P等气象因子与蒸腾速率Tr相关性较高,风量W与蒸腾速率Tr的相关性较低,且影响效果不显著。影响蒸腾速率的主要气象因子为太阳辐射。

Relationship between jujube trees transpiration rule and the weather factors in arid areas

In order to research the relationship between jujube trees transpiration rule and the weather factors,using the Dynagage wrap measuring sap flow meter to collect the data,and combined with a small automatic weather station witch can simultaneously measure the meteorological data,analyzed the relation of jujube trees diurnal variation of transpiration rate with the meteorological factors.The results show that different types of weather,the diurnal variation of transpiration rate is significantly different.During sunny weather,the transpiration rate curve showed a single peak curve trend,and the transpiration rate of more than 2000 g/h lasts long duration.In cloudy and rainy weather,the transpiration rate is relatively small,and the transpiration rate curve mostly showes in the form of multi-peak curve.The diurnal transpiration rate gradually increases from May,June and July to reach the maximum value in a year,then gradually reduces.These meteorological factors such as air temperature Ta,relative humidity RH,solar radiation Rn and rainfall P associate a higher relation with the transpiration rate Tr.But the wind speed is less relevant with the transpiration rate Tr and do not significantly affect the results.The main weather influence on the transpiration rate is solar radiation.