电阻率成像法在树干水分吸收过程研究中的应用  

Application of electrical resistivity tomography in studying water uptake process in tree trunk

作　　者：吴华桥[1,2] 周启友[1] 刘汉乐[1] 唐明杰[2] 

机构地区：[1]南京大学地球科学与工程学院水科学与工程学院,南京210093 [2]江苏省有色金属华东地质勘查局,南京210093

出　　处：《生态学杂志》2009年第2期350-356,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金资助项目(40371021和40771038)

摘　　要：将地球物理学中广泛运用的电阻率成像法成功地运用于树干内部截面电阻率分布特性的监测,利用电阻率平面分布图来分析树干内水分的空间分布和动态变化特征。结果表明:截面内树干水分的含量具有从核心部沿径向向外逐渐递增的趋势;位置较高的截面比较低的截面具有更多的水分含量,但充足的水分补给能打破这种水分分布的规律性,靠近补给源的截面含水率上升幅度最高;即使是在水分补给充足的情况下,树干内水分的吸收并不是面状饱和推进的过程,而是存在着优先纵向流动的生理机制;利用电阻率的变化,可以实现水分在截面上的优势流的定位。In this paper, the widely used electrical resistivity tomography in geophysics was successfully applied to monitor the distribution character of electrical resistivity in the sections of tree trunk, and, with the images obtained, the spatial distribution and dynamic change of water in the trunk were analyzed. The results that the water content in tree trunk sections had an increasing trend from the core to the outside along radial direction. The sections at higher position generally had higher water content than those at lower position, but it was not true when plenty of water was supplied. Even under the sufficient supply of water, the water uptake process in tree trunk was not a kind of saturated propulsive movement, but of an axial preferential movement. By using the electrical resistivity variation data, the preferential flow of water movement in tree trunk sections could be reasonably located.

关 键 词：电阻率 树干 含水量 水分分布 水分吸收 

分 类 号：Q945[生物学—植物学]