不同水分状况下桃树根茎液流变化规律研究

利用热脉冲技术研究桃树根茎液流变化规律，并用自动气象站对气象因子进行同步监测。对液流日变化、日际变化及不同位点液流变化规律进行了研究，还分析了水分胁迫下树干液流的波动特征。运用回归的方法建立环境气象因子与树干液流量之间的数量关系。其结果表明：根茎液流日变化和日际变化趋势相同；木质部内不同深度处液流速率大小不同；水分胁迫下，树干液流有波动特征；气象因子与树干液流量之间的数量关系能很好地预测桃树的蒸腾耗水量。

Variations of Stem and Root Sap Flow of Peach Tree Under Different Water Status

In this paper, the heat-pulse technique was applied to study the stem and root sap flow of peach. At the same time, an automatic weather station was used to monitor meteorological parameters. The day-to-day variation of stem and root sap flow, the variation of stem and root sap flow at different depths below the cambium and the variant characteristics of stem sap flow of peach tree under different water status were investigated. The results show that, the day-to-day variant trend of sap flow in the stem is similar to that in the root, the stem and root sap flow rates at different depths below the cambium are various. As well as there are some fluctuations of stem-sap flow under water stress, and the sap flow model developed can forecast the peach transpiration well.