西オーストラリア・レオノラ乾燥地域におけるCO_2固定大規模植林技術の検討(1)塩と植生との関係  [in Japanese] Study of Global Carbon Sequestration Using Afforestation Technology in Arid Land Near Leonora, Western Australia (1) Relation between biomass amount and salt-concentration  [in Japanese]

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Abstract

現在, 地球温暖化問題における二酸化炭素の有効な削減策の提示が急がれている. そこで, 太陽エネルギーを利用した陸上系での生物的固定法, すなわち植林事業が有効な手段の一つだと考えられる. 本研究では技術的に未解決の問題を多く残し, 研究課題も多い乾燥地域である西オーストラリア州・レオノラ地域を対象地域とした.<BR>本報告では1999年2月8日から3月6日に現地調査を行い, 土壌・透水性・塩濃度・栄養塩類濃度の分析を行った結果を報告し, 主にバイオマス量との関係を議論した. レオノラ地域において主要樹種であるフトモモ科ユーカリ属<I>E. camaldulensis</I>を植林する際の目安として, 飽和透水係数1.9×10<SUP>-3</SUP>cm/s程度以上, ハードパンまでの深さ180cm程度以上, 塩濃度0.05meq/100g程度以下, 栄養塩類濃度0.36meq/100g 程度以上の土壌環境が必要であることが分かった. これらの条件が満たされると, 現存炭素固定量42t-C/haが見込まれる.

The afforestation of arid areas is expected to make an appreciable contribution to global carbon sequestration. The final target of this project is increasing carbon stock by 5-20 times the present level by afforestation using methods such as efficient water harvesting, irrigation, soil-improvement cultivation, careful species selection and a large increase in rainfall. Near Leonora in Western Australia, where the mean annual rainfall is 220mm/y, factors for successful afforestation are water, soil, salt and nutrition for carbon sequestration; to be specific, saturated hydraulic conductivity, depth of soil, salt concentration and nutrition concentration. The results of measurements at eight sites in the area have been reported for saturated hydraulic conductivity rang-ing from 5.0×10<SUP>-4</SUP> to 2.8×10<SUP>-3</SUP>cm/s, with the depth of soil ranging from 30 to 180cm, salt concentrations ranging from 0.05 to 0.40meq/100g, nutrition concentrations ranging from 0.11 to 0.36meq/100g, and fixed carbon quantity assessment ranging from 0 to 49t-C/ha. Based on these measurement results, a flow chart is proposed for determining the controlling factors and those that should be improved. This paper mainly describes the relation between salt and biomass from the view point of salt concentrations in soil and leaf. Growth of <I>E. camaldulensis</I> needs a saturated hydraulic conductivity of 1.9×10<SUP>-3</SUP> cm/s, a depth of soil of 180cm, a salt concentration of 0.05meq/ 100g and nutrition concentration of 0.36 meq/100g. The growth of <I>Acacia. aneura</I> needs a saturated hydraulic conductivity of 2.8×10<SUP>-3</SUP>cm/s, a depth of soil of 60cm, a salt concentration of 0.09meq/100g and a nutrition concentration of 0.36meq/100g. Results of Na/K ratio in leaves of <I>Melaleuca sheathiana</I> indicate that it tolerates.

Journal

  • Bulletin of the Society of Sea Water Science, Japan

    Bulletin of the Society of Sea Water Science, Japan 54(3), 196-204, 2000-05-25

    The Society of Sea Water Science, Japan

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Codes

  • NII Article ID (NAID)
    10008275862
  • NII NACSIS-CAT ID (NCID)
    AN0018645X
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03694550
  • NDL Article ID
    5353717
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山) // ZP8(科学技術--化学・化学工業--無機化学・無機化学工業)
  • NDL Call No.
    Z15-47
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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