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1993 Fiscal Year Final Research Report Summary

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

Research Project

Project/Area Number 04806036
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field コンクリート工学・土木材料・施工
Research InstitutionTOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY (1993)
Shimane University (1992)

Principal Investigator

SHIBUSAWA Sakae  TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY, FACULTY OF AGRICULTURE, ASSOCIATE PROFESSOR, 農学部, 助教授 (50149465)

Project Period (FY) 1992 – 1993
KeywordsL-SYSTEM / HIERARCHICAL MODEL / SOIL BULK DENSITY / MAIZE / ROOT SYSTEM PATTERN / FRACTAL / ROOT BRANCHING / ROOT DENSITY DISTRIBUTION
Research Abstract

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.

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 渋沢栄・藤浦建史・岩尾俊男・竹山光一: "土壌密度変化のトウモロコシ根系分布への影響" 農業機械学会誌. 54(3). 53-60 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Shibusawa: "Hirarchical Modeling of a Branching Growth Root System Based on L-System" Acta Horticulturae. 319. 659-663 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 渋沢栄・藤浦建史・岩尾俊男・竹山光一: "トウモロコシ根系パターン形成の階層的モデリング" 農業機械学会誌. 55(2). 101-108 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 渋沢栄・国立卓生・岩尾俊男・藤浦建史: "土壌密度分布とトウモロコシ根系パターンの関係" 農業機械学会誌. 55(5). 111-118 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sakae SHIBUSAWA: "Modeling Corn Root System Development under Various Soil Bulk Density" Proc.11th Inter.Conf.ISTVS/Lake Tahoe USA. 734-743 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Shibusawa: "SUBSEC Plan and Root Growth Model" Proc.1st Inter.Semi.FMDC/JICA. 185-193 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.SHIBUSAWA, T.FUJIURA, T.IWAO, K.TAKEYAMA: "Impacts of soil density change on corn root distribution" J.JSAM. 54-3. 53-60 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.SHIBUSAWA: "Hierarchical modeling of a brancing growth root system based on L-system" Acta Horti. 319. 659-663 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.SHIBUSAWA, T.FUJIURA, T.IWAO, K.TAKEYAMA: "Hierarchical modeling of a brancing growth patterns in a root system of corn" J.JSAM. 55-2. 101-108 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.SHIBUSAWA, T.KOKURYU, T.IWAO, T.FUJIURA: "Formation of the root system of corn under a condition of varying soil density" J.JSAM. 55-5. 111-118 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.SHIBUSAWA: "Modeling corn root system developed under various soil bulk density" Proc.11th Inter.Conf.ISTVS. 734-743 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.SHIBUSAWA: "SUBSEC plan and root growth model" Proc.1st Inter.Semi.FMDC/JICA.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.JSAM: "the Farm Machinery for Developing Countries" Journal of the Japanese Society of Agricultural Machinery, ISTVS : the International Society of Terrain-Vehicle Systems, FMDC.

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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