摘要
采用基于热扩散原理的ES-SF茎流测量系统,监测了盐池毛乌素沙地白榆树干液流的动态变化,同时用自动气象站记录附近的太阳辐射、最高与最低气温、空气相对湿度、风速等气象因子,探讨气象因子对树干液流的影响。结果表明:白榆树干液流日变化为多峰型,昼夜变化显著且夜间液流量小而稳定,晴天变化幅度最大,阴天变化幅度最小;树干液流主要集中在8:00-18:00,占全天液流总量的80%多;白榆树干液流变化趋势与环境因子变化趋势相吻合,相关性分析表明,影响液流变化的主要环境因子依次为太阳辐射、空气温度、空气相对湿度和风速。
The EC-SF Sap Flow Measuring System were applied to study the diurnal changes of stem sap flows for Ulmus pumila based on the thermal dissipation theory. At the same time, the circumstance factors around the Ulrnus purnila were recorded by radiation, air temperature, air elative humidity and wind speed sensor,and relationship between the sap flow velocity and the circumstance factors were discussed. The results showed that the diurnal variations of sap flow velocity of the Ulmus purnila were as a multi-peaked curve; the stem sap flow varied regularly in the diurnal term and the sap flow velocity is little and standy; Magnitude of sap flow changed considerably between sunny and rainy days. The sap flow density between 8.. 00 and 18：00 was the major in one day, and it was more than 80%. The sap flow density of the Ulmus purnila was positively correlated with some ambient environmental factors. The order of their coefficient from correlation analysis was solar radiation 〉air tern perature〉air elative humidity〉wind speed.
出处
《水土保持研究》
CSCD
北大核心
2008年第6期85-88,共4页
Research of Soil and Water Conservation
基金
国家十一五科技支撑专题"沙区人居环境保障与工程防沙技术研究"(2006BAD26B03)
关键词
毛乌素沙地
白榆
热扩散技术
树干液流
Mu Us Sandy Area
Ulmus pumila
thermal dissipation method
stem sap flow
