稻茬麦根系构型的定向分型分析  

Dimensional fractal of post-paddy wheat root architecture

作　　者：陈信信 丁启朔[1] 李毅念[1] 薛金林[1] 陆明洲[1] 邱威[1] 

机构地区：[1]南京农业大学工学院/江苏省智能化农业装备重点实验室,南京210031

出　　处：《应用生态学报》2015年第6期1711-1717,共7页Chinese Journal of Applied Ecology

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

摘　　要：为探索稻茬麦根构型的方向性,使用田间数字化仪实现稻茬麦根系的数值化,将根系数据导入Pro-E重构出根系的空间状态图,然后将根构型每隔10°进行各向投影,计算根系构型在18个维度的分形维数与分形丰度.结果表明:小麦苗期根构型在各维度的分形特征具有较强的规律性,表明根系在土体中的分布具有明显的方向性.在苗期到返青期,根构型在18个维度的分形指标波动性大,表明这一时期内根系生长处于持续的动态变化过程.在拔节期,根构型在各维度的分形再次呈现出一定的规律性,表明根系在土体中的分布重新表现出明显的方向性.该研究方法可以精准描述和分析植物根系在田间环境中的分布状况.To evaluate whether crop rooting system was directionally dependent, a field digitizer was used to measure post-paddy wheat root architectures. The acquired data was transferred to Pro-E, in which virtual root architecture was reconstructed and projected to a series of planes each separated in 10° apart. Fractal dimension and fractal abundance of root projections in all the 18 planes were calculated, revealing a distinctive architectural distribution of wheat root in each direction. This strongly proved that post-paddy wheat root architecture was directionally dependent. From seedling to turning green stage, fractal dimension of the 18 projections fluctuated significantly, illustrating a dynamical root developing process in the period. At the jointing stage, however, fractal indices of wheat root architecture resumed its regularity in each dimension. This wheat root architecture reco- vered its dimensional distinctness. The proposed method was applicable for precision modeling field state root distribution in soil.

关 键 词：稻茬麦根系 根构型 周向分布 投影面分形分析 

分 类 号：S512.1[农业科学—作物学]