树木水力结构特征季节变化规律研究  

Seasonal change of hydraulic architecture characteristics of some trees species in north China

作　　者：刘晓燕[1,2] 苗爱梅 李吉跃[4,2] 

机构地区：[1]北京市丰台区林业工作站,北京100071 [2]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083 [3]河北省林果桑花质量监督检验管理中心,河北石家庄068000 [4]华南农业大学,广东广州510642

出　　处：《河北林果研究》2009年第2期125-130,共6页Hebei Journal of Forestry and Orchard Research

基　　金：国家自然科学基金项目(30070637);教育部高等学校博士点基金资助;骨干教师资助项目

摘　　要：在北京林业大学校园内选取侧柏、刺槐等11个针阔叶树种为研究对象,测定1 a生枝条小枝水势及水力结构参数季节变化。研究表明:小枝水势及水力结构参数均具有季节变化规律。导水率与比导率季节变化规律基本相似,从树种材性上看均表现为:环孔材树种>散孔材树种>无孔材树种,而木质部栓塞化程度也表现为:环孔材树种>散孔材树种>无孔材树种。枝条水势、导水率和比导率季节变化节律均与树木生长发育节律相一致,都表现出枝条木质化时期>嫩枝生长期>早春,而木质部空穴和栓塞化程度也存在着季节变化节律,且与比导率季节变化节律相反,即:早春>嫩枝生长期>枝条木质化时期。Eleven tree species Platycladus orientalis and Acer truncatum etc., were selected on the campus of the Beijing Forestry University. The seasonal change of hydraulic architecture parameters and water potential of one-year-old twigs were measured. The results show that there are the seasonal change trend in water potential and hydraulic architecture parameters. The seasonal change law of hydraulic conductivity is resembled to special conductivity, according to characteristic of vessels and tracheids, we can know that the seasonal change range of hydraulic conductivity and special conductivity in both conifer and broad-leaved species are ring-porous species 〉 diffuse-pemus species 〉 none-porous species. In addition, xylem cavitation and embolism of species are also ring-porous species 〉 diffuse-porous species 〉 none-porous species. The seasonal change trend of water potential, hydraulic conductivity and special conductivity are in line with that of plant growing. All of seasonal change trends show lignifieations period 〉 twigs growing period 〉 early spring. However, xylem embolism seasonal change trend appears early spring 〉 twigs growing period 〉 lignitications period, which is reversed to seasonal change trend of special conductivity.

关 键 词：水力结构 季节变化 小枝水势 导水率 比导率 

分 类 号：S718.4[农业科学—林学]