Abstract：To obtain the clear threedimensional figures and the distribution characteristics of tomato roots, Xray μCT was used to scan tomato plug seedlings and realize root reconstruction. For the scanning parameters with voltage of 55 kV, current of 72 μA and resolution of 45 μm, the relative error of root volumes between 3D reconstruction and actual measurement is 4.77%. At the vertical direction, the root distribution density changes significantly. The seedling plugs are more prone to fracture in the middle of root density lower areas. The ratio of the minimum and the maximum root distribution densities can be considered as evaluation indicator of root distribution uniformity. At the horizontal direction, the seedling plugs are surrounded by the lateral roots, and the soil substrate is shaped without dispersing. The peripheral root distribution density can be used as another evaluation indicator of rootsoil tightness. When the seedling substrate is mixed with peat, vermiculite and perlite in volume ratio of 3 ∶1 ∶1, and the compaction degree of seedling substrate is 1.2 times the pore volume of tray, the root distribution uniformity and the peripheral root distribution density are 0.564 and 0.021 1,respectively.
毛罕平, 刘洋, 徐静云, 韩绿化, 李亚雄, 李华. 基于μCT的番茄穴盘苗根系结构及分布特征[J]. 江苏大学学报（自然科学版）, 2019, 40(3): 288-294.
MAO Han-Ping, LIU Yang, XU Jing-Yun, HAN Lu-Hua, LI Ya-Xiong, LI Hua. Root structure and distribution characteristics of tomato seedlings based on μCT
[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2019, 40(3): 288-294.
2019, Vol. 40 
