桉树与杉木树干液流特征对比研究

在福州市宦溪镇运用热扩散法和热平衡法对桉树杉木人工混交林内的桉树(Eucalyptus spp.)、杉木(Cunninghamia lanceolata)的树干液流进行测定,采用TDR测定土壤含水量,同时对土壤、叶片水势进行测定,对比研究桉树与杉木的蒸腾耗水差异。结果表明:桉树和杉木树干液流日动态变化具有相同的昼夜节律性,均呈中午高、早晚低的单峰型变化;桉树的液流密度小于杉木的液流密度,但桉树的液流通量则大于杉木的液流通量;桉树的单木日均耗水量大于杉木的日均耗水量;桉树对水分的获取能力大于杉木。

Comparative Study on the Sap Flow of Eucalyptus and Chinese Fir

Both of thermal diffusion method and thermal equilibrium method were used to determine the sap flow of eucalyptus and Chinese fir in artificial mixed forest of eucalyptus and Chinese fir in Huanxi Town,Fuzhou.The TDR was used to record soil moisture,and recording the data of the soil water potential and the leaf water potential,compared with the water evaporation between eucalyptus and Chinese fir,the results showed that:changes in sap flow in eucalyptus and Chinese fir both had obvious circadian rhythm,the daily sap flow of them both appeared single peak.The fluid flow density of eucalyptus was lower than the Chinese fir's,but the chest area of the two species of similar age had a big difference that the eucalyptus was much larger than Chinese fir's.The sap flow of eucalyptus was more than the sap flow of Chinese fir.The average daily consumption of water of eucalyptus was much more than Chinese fir's.In addition,the eucalyptus' ability of obtaining water was stronger than Chinese fir's.