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Effects of mycorrhizal inoculum on the dynamics of heavy metals in the rhizoshere.

Research Project

Project/Area Number 09660066
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Plant nutrition/Soil science
Research InstitutionKochi University

Principal Investigator

IWASAKI Kozo  Kochi University, Faculty of Agriculture, Associate Professor, 農学部, 助教授 (40193718)

Co-Investigator(Kenkyū-buntansha) SAKURAI Katsutoshi  Kochi University, Faculty of Agriculture, Professor, 農学部, 教授 (90192088)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥2,800,000 (Direct Cost: ¥2,800,000)
Keywordsmycorrhiza / rhizosphere / heavy metals / nutrient dynamics / soil amendment
Research Abstract

To investigate the dynamics of heavy metals in the rhizosphere under the application of steriled and non-sterile arbuscular mycorrhizal inoculum, sunflower, plants were grown in a rhizobox system. When the non-sterile mycorrhizal inoculum was supplied in the central compartment of the rhizobox, nutrient contents of the shoots increased without reducing the plant growth. The analysis of the rhizosphere soils showed the increase in the amounts of water soluble Zn and Fe in addition to the P, and in the activity of phosphomonoesterase activities. However, neither the excretion of low-molecular-weight organic acids (LMOAs) specific to the treatment nor the increase in the amounts of LMOAs was observed. These results indicated that the dissolution of insoluble phosphates was caused by the enzymes originated from arbuscular mycorrhiza and/or mycorrhizal roots and that the Zn and Fe sorbed by the insoluble P were released together with the P.It was supposed that appropriate application of mycorrhizal inoculum would be effective to utilize the nutrients accumulated in the soil.
On the other hand, propagation of ectomycorrbizal fungi from the mycorrhizal tree to the non-mycorrhizal seedlings was examined at Forest Research Station Niah, Sarawak State, Malaysia. The effects of planting density and distance from the mycorrhizal tree on the infection rate, growth, and nutrient contents of the seedlings were evaluated. In this experiments, the dynamics of heavy metals in the rhizosphere could not be clarified due to the poor nutrient condition of the soil. However, the p content of the roots with high infection rates was higher than those with low infection rates, which suggested that the mycorrhizal tree was effective in supplying the nutrients to the seedlings even when the available nutrients in the soil are restricted. Further experiments will be needed, especially under the soil conditions which ectomycorrhizal fungi do not act parasitically towards the seedlings.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Sakurai, K.: "Determination of low molecular weight organic acids in forest soils." "Plant nutrition for sustainable food production and environmet". 503-504 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 櫻井克年: "マレーシア・サラワク州・バカムにおける生態系修復を目指した試験造林" 地球環境. 3・1 印刷中. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 櫻井克年: "「樹木生理生態学」9.1菌根" 朝倉書店印刷中, (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Sakurai, K: "Determination of low molecular weight organic acids in forest soils." Plant nutrition for sustainable food production and environment. T.Ando et al. (Eds.), Kluwer Academic Publishers.503-504 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Sakurai, K.: "Experimental rehabilitation of the ecosystem at Bakam Forest Reserve, Sarawak, Malaysia." Grobal Environmental Research. 3-1 (in Japanese) (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Sakurai, K.: "9.1 Mycorrhiza" Tree physiology and ecology. T.Koike (Ed.), Asakura-syoten, (in Japanese) (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 櫻井克年: "マレーシア・サラワク州・バカムにおける生態系修復を目指した試験造林" 地球環境. 3・1 印刷中. 印刷中 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 櫻井克年: "樹木生理生態学 9.1 菌根" 小池孝良編、朝倉書店 未定, 未定 (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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