尾巨桉树干液流特性及其影响因子分析  

Stem Sap Flow Characters of Eucalyptus Urophylla×E.Grandis and Its Influence Factors

作　　者：王文[1] 朱烨[1] 诸葛绪霞[1] 罗智锋[1] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098

出　　处：《水土保持通报》2013年第3期159-164,共6页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目"西南喀斯特流域水文变异性及生态水文过程耦合模拟研究"(40930635)

摘　　要：应用热扩散式探针法于2010年7—8月对广东尾巨桉进行树干液流观测,并结合小型气象站采集的同步气象数据分析了环境因子与液流的关系。结果表明,尾巨桉液流的日变化有明显的昼夜节律,夜间有微弱的液流活动。树干南北两侧液流速率相关性显著(R2=0.994),数值上北侧高于南侧。尾巨桉液流的变化与光合有效辐射、空气相对湿度及风速3个环境因子的变化具显著相关关系,按相关程度排序为:光合有效辐射>空气相对湿度>风速。夜间液流与环境因子相关性不显著,主要用于植物补水。Sap flow of Eucalyptus urophylla×E.grandis in Guangdong Province was measured from July to August in 2010using thermal dissipation probe method.The relations of sap flow to ambient environmental factors were analyzed in combination with environmental factors collected from the micro-meteorological station.Daily sap flow had significant circadian variation with weak sap flow activities at night.The velocity in the north was higher than the south and the correlation between them was significant.There were marked correlations between sap flow and ambient environmental factors〔photosynthetically active radiation（PAR）,relative humidity（RH）and wind speed〕,and the correlated degree was in the order of PAR RH wind speed.The equation set up with stepwise regression shows that it reaches an extremely significant level.Sap flow at night was mainly associated with water storage in the trunk and had no significant correlation with ambient environmental factors.

关 键 词：尾巨桉 热扩散式探针法 树干液流 影响因子 

分 类 号：Q948.1[生物学—植物学]