美植袋物理控根容器培育对玉兰苗根系构型的影响
Effect of Root-Pruning Bags on Magnolia denudata Desr's Root Architecture
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摘要: 比较了在美植袋物理控根容器中以及大田条件下生长的3年生玉兰苗的生长量、根系构型和透根情况,结果表明:美植袋培育的玉兰苗的生长量与大田培育的玉兰苗无显著差异,但在根系构型上有显著不同,美植袋中生长的玉兰苗在距离主干20 cm范围内的吸收根(根系直径在0 2 mm的根系)的根尖数、根表面积和根体积分别为12 996.66个·株-1,1 674.4 cm2·株-1,40.82 cm3·株-1,疏导根(根系直径在2 5 mm的根系)的根尖数、根体积和根表面积分别为195.09个·株-1,969.09 cm2·株-1,67.73 cm3·株-1,明显大于大田培育的玉兰苗,具有更高的吸收和疏导能力。垂直方向上,美植袋中生长的玉兰苗在距离容器顶端21 33 cm具有较多的疏导根和吸收根,水平方向上,在距离容器侧壁0 14 cm处具有较多的吸收根和疏导根。在这区域内吸收根和疏导根的体积和面积均占根系总体积和表面积的71.5%,根系构型发生了明显改变。美植袋容器使用3年后,已经老化,出现了透根现象,透出的根系主要是直径在0 1 mm的细根和直径大于10 mm的粗根。Abstract: The seedling growth, root architecture, root-penetrating of Magnolia denudata Desr. planted in root-pruning bags for three years were compared to that grown in field by root investigation. The result showed: There was no difference in seedlings growth between M. denudata grown in field and planted in root-pruning bags, while the result of root architecture showed difference, the absorption root (root tips diameter ranged from 0—2 mm) and leading root tips (root tips diameter ranged from 0 mm to 2 mm, 2 mm to 5 mm of M.denudata grown in root-pruning bags had more root tips, root surface area, and root volume. M. denudata planted in root-pruning bags have larger root surface area and root volume which was from the containers' wall of 0—14 cm in horizontal direction and from the top of 21—33 cm in vertical direction, while the amount of root tips is 71.5% of all the root tips. The root-pruning bags used for three years have been worn out so that some roots penetrated the wall of bags.The roots penetrating the bags were that with the diameters below 1 mm and more than 10 mm.
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