基于物候期的核桃树干液流特征

Sap Flow in Juglans regia during Different Phenophases

运用SF100热脉冲茎流仪对核桃树干液流按物候期进行了观测,并对其周围环境因子如辐射强度、空气温度和空气相对湿度进行了同步监测。结果表明,核桃花期和果实成熟期,水分条件较好,液流量较大,液流速率与辐射强度和空气温度的相关性较好;果实生长期由于受到土壤水分的强烈胁迫,液流量较小,液流速率与相对湿度的偏相关系数最高,其次是太阳辐射,而与空气温度的相关性则较差。

An experiment was conducted to observe the stem-sap flow in Juglans regia during different phenophases with the SF100 sap flow recorder by the heat pulse technique. The meteorological factors around J. regia trees, such as air temperature, relative humidity and radiant intensity were monitored simultaneously. Results show that close correlations were found between sap flow velocity and radiant intensity, air temperature due to enough water and higher sap-flow flux during anthesis and fruit maturity. In the fruit growth period, the sap-flow flux in J. regia under serious water stress condition is less, and the partial correlation coefficient between sap flow velocity and relative humidity is the highest, that between sap flow velocity and solar radiation is higher, and that between sap flow velocity and air temperature is the lowest.