【摘要】 采用热扩散式边材液流探针和环境自动监测系统对北京3种园林树木的树干液流及主要环境因子进行了一个生长季的同步观测.结果表明,3树种树干液流的日变化呈明显的单峰曲线,晴天的液流速率大于多云天和阴天,紫叶李和悬铃木的日耗水量明显大于元宝枫;对不同天气3树种每h的液流速率与相应的环境因子进行逐步回归分析.结果显示,影响3树种液流速率的主要环境因子是空气温度、空气相对湿度、辐射强度和5 cm土层温度,在不同天气里起主导作用的因子不同,环境因子与树干液流之间的数量关系能较好地预测树木的蒸腾耗水量.更多还原

【Abstract】 By using the thermal dissipation sap flow probe(TDP) and environmental auto-detecting system,measurement of the sap flow of three gardening trees in Beijing was conducted during the 2005-growing season.Results show that the daily course of sap flow is a single-peaked curve;that the velocity in clear days is higher than in cloudy days and under an overcast sky,and that the daily water consumption of Prunus cerasifera and Platanus hispanicq is higher than that of Acer truncatum.Results of statistical analyses indicate that air temperature,relative humidity,solar radiation and temperature of the soil 5 cm deep are the major factors affecting sap flow rate in different weather.With the relationship of sap flow rate to environmental factors,the amount of evapo-transpiration can be predicted.更多还原