中文摘要：

2012年7—10月,采用液流测定系统监测了位于浙江省开化县的毛红椿人工林上下坡位的树干液流,并同步监测生态环境因子,分析了毛红椿人工林树干液流与土壤含水量、温度和水势等环境因子的关系.结果表明：研究区上、下坡位树干液流日变化均呈典型的＂昼高夜低冶单峰曲线;下坡位毛红椿树干液流速率平均值显著高于上坡位;上坡位土壤温度显著高于下坡位,而下坡位土壤含水量和土壤水势显著高于上坡位;下坡位土壤含水量和土壤水势是影响毛红椿树干液流速率的主要因子,而上坡位土壤温度和土壤水势对毛红椿树干液流速率有较大影响.

英文摘要：

The sap flow and environmental factors, including temperature, water content and water potential of soil, were continuously measured by using an auto-data collection system at the upper and lower slopes of Toona ciliata vat. pubescens plantation in July to October, 2012 to investigate the relationships between the sap flow and environmental factors. The results showed that, the trunk sap flow velocity of the two positions both presented a typical single-peak curve, with high values in the daytime and low values in the nighttime. The average sap flow of the lower slope was significantly higher than that of the upper slope, Soil temperature of the upper slope was significantly higher than that of the lower slope, and soil water content and water potential were vice versa. Soil water con- tent and water potential were the leading environmental factors affecting the trunk sap flow velocity at the lower slope, while soil temperature and water potential were the main environmental factors at the upper slope.