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BRANCHING GROWTH MODEL OF ROOTS DEVELOPED UNDER VARIOUS SOIL BULK DENSITY CONDITIONS BASED ON EXTENDED L-SYSTEM

基于扩展L系统的不同土壤容重条件下根系的分枝生长模型

基本信息

批准号：
04806036
负责人：
SHIBUSAWA Sakae
金额：
$ 0.32万
依托单位：
TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY (1993)Shimane University (1992)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

Modeling the branching growth patterns of the maize root system developed under various soil bulk density in thin root boxes was carried out. The outputs of the work are as follows.1) Meta-rules which described an entire feature of root system, such as a power-scaling on the distribution of roots, a root density equation and an outline curve equation of root system, were extracted from the observation on four samples of corn root system obtained.2) Branching grouwth rules for nodal and first order branching roots were defined on the basis of stochastic L-systems.3)Nutation and georeacting curvature of root tip were assumed as root tip movement rules by references.4)Integrating three kinds of rules described above as large scale rules loosely governed small scale rules, and introducing an "environmental switch" by varying soid density yielded "Hierarchical Root Growth Model". Computer simulations by using the model depicted well the observed root systems.5)Root box experiments under various sois density conditions proved that the soil density variation strongly influenced the formation of the maize root system and these properties were also simulated well by the model.6)2D root growth model established in this work has given a good prediction of root growth under controlled 2D soil density conditions, though 3D root growth model has not established yet.

对薄根箱中不同土壤容重下玉米根系的分枝生长模式进行了建模。工作成果如下：1)通过对获得的4个玉米根系样本的观测，提取了描述根系整体特征的元规则，如根分布的幂标度、根密度方程和根系轮廓曲线方程。2)基于随机L系统定义了节点和一阶分枝根的分枝生长规则。3)章动和根系生长规则。参考文献将根尖的地理反应曲率假设为根尖运动规则。4)将上述三种规则作为大尺度规则松散控制小尺度规则进行整合，并通过改变固体密度引入“环境开关”产生“层次根系生长模型”。使用该模型进行计算机模拟，很好地描述了观察到的根系。5）不同土壤密度条件下的根箱实验证明，土壤密度变化强烈影响玉米根系的形成，并且该模型也很好地模拟了这些特性。6）尽管尚未建立3D根系生长模型，但本文建立的2D根系生长模型可以很好地预测受控2D土壤密度条件下的根系生长。