酸枣树干液流速率与环境因子的关系

选择华北地区典型灌木酸枣为研究对象，用TDP传感器测定树干液流速率，并对不同气象条件下的液流速率与环境因子进行了相关性分析及模型模拟。结果表明:不同气象条件下，各环境因子都对树干液流速率有影响，但程度不同。晴天、阴天、雨天影响树干液流速率最重要的环境因子分别是空气温度、太阳辐射和降雨量。在不同气象条件下，酸枣树干液流速率与环境因子间回归模型的自变量构成有很大差异，且晴天和阴天模拟效果较好，雨天模拟效果不佳。 

Relationship between stock sap flow rate of Zizyphus acidojujuba Hu and environmental factors

Zizyphus acidojujuba Hu, which is the typical shrub of northern China, was selected to determine the stock sap flow by TDP. The correlation between sap flow rate and environmental factors was analyzed and the regression models between them in different weather conditions were constructed by SPSS. The results showed that in different weather conditions, the sap flow rate was influenced by each environmental factor with different levels. In sunshine, cloudy and rainy days, the most important environmental factors to stock sap flow rate were air temperature, solar radiation and rainfall, respectively. In different weather conditions, the environmental factors brought into model were very different. The simulation model in sunshine and cloudy was nice but was not so good in rainy day.