稻茬麦根系构型可视化与三向分型维研究  

Visualization of Post-paddy Wheat Rooting System and 3-D Fractal Dimensions

作　　者：陈信信 丁启朔[1,2] 李毅念[1] 丁为民[1] 田永超[2] 

机构地区：[1]南京农业大学江苏省智能化农业装备重点实验室,南京210031 [2]南京农业大学国家信息农业工程技术中心,南京210095

出　　处：《农业机械学报》2015年第3期328-335,共8页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(41371238);江苏优势学科建设资助项目(PAPD)

摘　　要：提出一种根系可视化分析方法用于定量稻茬田环境的小麦根系构型。使用根系构型数字化仪测试稻茬麦苗期根系构型,将所测数据导入Pro/E平台进行根系构型的3-D重构,然后对可视化根系进行3向平面投影,计算小麦根系在不同平面的分形维数与分形丰度。结果表明,该方法可以真实反映出田间稻茬麦根系构型的动态变化状况,而根系分形维数与分形丰度随时间逐步递增,正视图面的分形维数和分形丰度总大于左视图面。从播后第98天开始,俯视图面的根系构型分形维数与分形丰度出现突增。在3个投影面上稻茬麦根系的分形维数与分形丰度都高度相关,二者与根总长也存在一定的相关关系。Measurement of crop rooting system architecture and the calculation of root fractal dimensions plays an important role in precision crop rooting management. A technique for root visualization and analyzing was proposed to assess field state post-paddy wheat rooting system architecture. The proposed technique applied a root digitizer to measure wheat root system architecture, and changed the root system architecture into 3-D coordinates. The collected root topology data was then transferred to Pro/E platform for 3-D reconstruction. When the virtual root system was reconstructed, it was projected on three coordinate planes. The projected 2-D root architecture was then analyzed to derive fractal dimensions and fractal abundances. Results showed that the method could quantify the dynamics of the field-state wheat root system architecture. Both root fractal dimension and fraetal abundance increased over time. Fractal dimension and fractal abundance in the top plane were always higher than that in the right plane. Starting from 98 d after sowing, a rapid increase of fraetal dimension and fractal abundance was observed in the front plane. Fractal dimension was, for all the three projections, strongly correlated to fraetal abundance. Also, the fractal dimension and fraetal abundance were both correlated to total root length.

关 键 词：稻茬麦根系 3-D构型 根系可视化 三向分型维 

分 类 号：S154.4[农业科学—土壤学]