4种林木年轮水分输导模式研究

Patterns of water transport in tree rings of four tree species

以年轮为基本研究单位,对选择的4个树种(银中杨、蒙古栎、红松、落叶松)采用水分输导轨迹的染色标记和定量滴定方法,研究了林木的水分输导模式。结果表明:树干中不同年轮间的水分输送能力存在显著差异,新生年轮(近3年)的水分输送能力明显较强,从输送面积看均超过了总输送面积的2/3。在年轮与年轮之间没有发现水分的横向输导现象;水分的纵向输导在所研究的4个树种的各年轮中,分别呈现直线型、螺旋型、扇型或几种形式的组合从根向上输送,将其称为林木的"年轮水分输导模式"。

We took tree rings as the basic unit to investigate water transport patterns of four tree species （Populus alba × P. berolinensis , Quercus mongolica , Pinus koraiensis , Larix olgensis ） through dye test of sap flow and titration analysis. The results showed that the capability of water transport remarkably differed among tree rings. The newly-formed rings（ latest three rings） were more capable of transporting water, accounting for over 2/3 of the total water transport area. However, inter-ring water transport was not detected. The four tree species demonstrated different patterns of water transport in longitudinal direction（from the root to the top） , i.e. , linear, helical, sartorially radial or their combinations. These types were referred to as ＂water transport patterns in tree rings＂.