不同时间尺度上枣树树干液流的变异特性

为探寻枣树树干液流在不同深度和不同方位的变异特性,提高黄土丘陵区枣树蒸腾耗水量研究精度,在陕西省米脂县远志山红枣试验示范基地采用热扩散式探针(TDP)分别研究了枣树不同方位和不同深度的树干液流速率。结果表明:(1)不同方位探针监测结果间存在差异,研究时间尺度不同,各方位监测结果间的差异显著性不同,差异显著性大小表现为时尺度日尺度月尺度。(2)不同深度探针监测结果间存在差异,随研究时间尺度的不同,不同深度探针监测结果间的差异显著性不同,差异显著性大小表现为时尺度日尺度月尺度。(3)在树干北侧和深度为20 mm的TDP监测值计算生育期耗水量更准确。

The variation characteristics of Jujube tree sap flow at different time scales

In order to explore the variation characteristics of jujube tree trunk sap flow at different depths and different directions, to improve the research precision of transpiration consumption of jujube trees in Loess Hilly Region, we utilized thermal dissipation probe (TDP) to study the trunk sap flow velocity of jujube trees at different directions and different depths respectively in the jujube experiment demonstration base of Yuanzhi mountain in Mizhi County of Shaanxi Province. The results showed that: (1) The difference of monitored results exited between different directions of the probe. The different research time scale, the monitored results in each direction was significant difference. The size of the significant difference expressed as: hourly scale>daily scale>monthly scale. (2) The monitored results at different probe depths existed difference, and with the different time scale, the significant difference was different between different probe depthes. The size of the significant difference expressed as: hourly scale>daily scale>monthly scale. (3) The water consumption in growth stage calculated by the monitored value of TDP installed at the north and the depth of 20 mm was more accuracy.