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Proposal of coexistent ecosystems with paddy and water-covered plant for promoting an efficient production of biomass resources

Research Project

Project/Area Number 14560279
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 生物資源科学
Research InstitutionUniversity of Tsukuba

Principal Investigator

SAKAI Naoki  University of Tsukuba, Institute of Agriculture and Forestry, Professor, 農林学系, 教授 (00092213)

Co-Investigator(Kenkyū-buntansha) HAYASHI Hisayoshi  University of Tsukuba, Institute of Agriculture and Forestry, Lecturer, 農林学系, 講師 (70251022)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2002: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsCoexistent ecosystems / Paddy field / Water hyacinth / Biomass production / Structure of community / Carbon fixation / Complication of systems / Water-covered plant / 複雑化 / 密度
Research Abstract

In an ordinary paddy field whose cultivated dominant crop is a paddy, we tried to propose a new cropping systems based on coexistence with the plural crops for expecting the mitigation of environmental impact and escape of monoculture systems. In this study, the effect of plant density in coexistent systems on growth rate, structure of community and yield of the two crops were investigated in the 2002-2003 experiments with three repetitions under the same condition of application rate of fertilizer. We used a water hyacinth as the water-covered model crop. Plant densities were 22.2 hills/m^2 for paddy, and 22.2, 16.7, 11.1, 5.6 and 0 hills/m^2 for water hyacinth, respectively. As a result, an introduction of water-covered crop contributed the increment of carbon fixation rate per unit area although some increased plant densities affected the competition of resources utilization and paddy yield negatively. Finally the optimum plant density of water hyacinth was estimated at the neighbor of 11.1 hills/m^2 from the viewpoint of carbon fixation.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] 坂井直樹, 増田和幸, 林 久喜: "バイオマス資源生産を目指した水面被覆植物とイネとの共存生態系の構築"農作業研究. 38・別1. 25-26 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 根津久美, 坂井直樹, 林 久喜: "イネとの共存生態系における水面被覆植物の栽植密度の効果"農作業研究. 巻39・別1. 23-24 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 坂井直樹, 増田和幸, 林 久喜: "バイオマス資源生産を目指した水面被覆植物とイネとの共存生態系の構築"農作業研究. 38・別1. 25-26 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 根津久美, 林 久喜, 坂井直樹: "イネとの共存生態系に及ぼす水面被覆植物の栽植密度の効果"農作業研究. 39・別1(印刷中). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 坂井直樹, 増田和幸, 林 久喜: "バイオマス資源生産を目指した水面被覆植物とイネとの共存生態系の構築"農作業研究. 38(別1)(印刷中). (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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