几何法测定生物栅中美人蕉根系面积

A Geometric Method of Determining Surface Area of Canna Roots in the Biological Grid Device

设计了1种测定生物栅中水生植物根系面积的方法。通过分别测定美人蕉(Canna indica)3级根平均直径和2级根平均直径计算得到植物根系总面积。这种方法比常用的不分级测定植物根系直径及表面积的方法准确度高1个数量级,可以应用于大根系植物的根系测定。研究结果表明,生物栅装置中美人蕉根系总面积39.4 m2,3级根系面积是2级根系的22.2倍,而体积比接近2∶1,3级根和2级根平均直径比小于1∶10。应用生物栅技术处理富营养化水体时,表面积占绝对优势的3级根系在对氮、磷等元素的吸收,作为微生物附着的重要载体及加强植物与填料的固着能力,改善根系与填料的空间结构等方面起重要作用。

Canna indica growing in biological grid were analyzed for its growth and surface area distribution characteristics of its root system. A geometric calculation method was designed to calculate surface area of its root system by determining diameters of its second-class and third-class roots,separately. The result of the calculation by this method is 10 times as accurate as those by the common method,in which calculation is done based on root diameters regardless of root classes. The surface area of the canna roots is 39.4 m^2, and the surface area of the third-class roots is 22.2 times as big as the second-class roots in the system. In the processes of eutrophication waterbody treatment by biological grid system the thlrd-class roots play an important role in absorbing N and P, carrying microorganlsms,enhancing adhering capacity of plant with fillers and improving the spatial structure of root system and fillers.