Stem sap flow density characteristics of ailing Betula platyphylla in 2001 was concerned with physiological control of transpiration. 叶感病白桦树干液流具有以上特点，是因为具有较强的蒸腾生理调控力，以适应叶部病害而求得生存。
Thermal dissipation method was applied to study the stem sap flow of Betula platyphylla for two consecutive growing seasons. 摘要应用热扩散法，对白桦树干液流进行连续两个生长旺期测定。
