CAJ | 학술논문

为探讨树木结构与功能的关系，对华南地区常见8种树木边材的导管特征进行观察，并利用Granier热扩散探针法测量干、湿季树干的液流密度，分析导管特征与树干液流的关系。结果表明，除红锥(Castanopsis hystrix)有两种导管外，大叶相思(Acacia auriculaeformis)、荷木(Schima superba)、火力楠(Michelia macclurei)、藜蒴(C. fissa)、马占相思(A. mangium)、柠檬桉(Eucalyptus citriodora)、尾巨桉(E. urophylla×E. grandis)的导管类型单一。导管特征在种间存在明显差异，且导管长度、密度和孔径之间存在明显相关性，它们与标准化的边材面积呈现显著相关。湿季液流最大值与导管特征无明显相关性，但整树最大蒸腾速率与导管特征呈显著相关；树木的日蒸腾量与导管特征也有明显相关性。因此，树木的液流速率并不受树干的导管影响；而树干的导管孔径与边材面积间的负相关权衡机制，可以降低树种间由于导管孔径差异引起的树干的水分输送速率的差异性。
위탐토수목결구여공능적관계，대화남지구상견8충수목변재적도관특정진행관찰，병이용Granier열확산탐침법측량간、습계수간적액류밀도，분석도관특정여수간액류적관계。결과표명，제홍추(Castanopsis hystrix)유량충도관외，대협상사(Acacia auriculaeformis)、하목(Schima superba)、화력남(Michelia macclurei)、려삭(C. fissa)、마점상사(A. mangium)、저몽안(Eucalyptus citriodora)、미거안(E. urophylla×E. grandis)적도관류형단일。도관특정재충간존재명현차이，차도관장도、밀도화공경지간존재명현상관성，타문여표준화적변재면적정현현저상관。습계액류최대치여도관특정무명현상관성，단정수최대증등속솔여도관특정정현저상관；수목적일증등량여도관특정야유명현상관성。인차，수목적액류속솔병불수수간적도관영향；이수간적도관공경여변재면적간적부상관권형궤제，가이강저수충간유우도관공경차이인기적수간적수분수송속솔적차이성。
In order to understand the relationship between tree structure and its function, the vessel characters of sap wood of eight tree species,Acacia auriculaeformis,Schima superba,Michelia macclurei,Castanopsis hystrix, C. fissa,A. mangium,Eucalyptus citriodoraandE. urophylla×E. grandisand their stem sap lfux densities in wet and dry season monitored by using Granier’s thermal dissipation probe method, were investigated in subtropical south China. The results showed that vessels were of single-type in these tree species except forM. macclureithat had two types of vessels. The vessel length, density and lumen diameter were signiifcantly different among the eight tree species, and obvious relationships among the three vessel characters were observed. The normalized area of sap wood had signiifcant relation with the vessel characters. No signiifcant relation of the maximum sap lfow with vessel characters was found, but it existed between the maximum whole tree transpiration rate and the vessel characters in wet season, and so did that of the daily total transpired amount with the vessel characters. Therefore, the vessel in trunk had no inlfuence on sap lfow rate, the negative trade-off relation between vessel diameter and sapwood area of trunk could the difference in water transpiration rate of trunk caused by the difference of vessel diameter of the tree species.