農地土壌の構造の変化が土壌の受食性に及ぼす影響について The Effect of Changes in Soil Structure of Agricultural Lands on Soil Erodibility

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土地の利用状況や利用歴が土壌の受食性に大きく影響する。本研究は農地土壌の構造と侵食量との関係を調べることを目的としており,耕起(通常の耕作が行われている圃場),不耕起(約6ヵ月休耕期間を設けている圃場),無耕起(約10年間耕作が行われていない圃場)の状態に置かれた3種類の隣接した圃場内の土壌の団粒分布,有機物含有量,三相分布などの違いから土壌構造を分析し,それぞれの状況における侵食量との関係を調べた。その結果,土壌浸食量が最も少なく受食性の低い土壌は不耕起土壌となり,耕起の状態よりも不耕起状態の方が農地保全の立場から効果的であることを実験的に証明できた。

As soil erodibility greatly depends upon the condition of the soil and land, this research investigates the relationship between soil erosion and soil structure. Experiments were carried out using soils collected from three different types of agricultural lands, namely tilled land (land plowed regularly)., fallow land (left fallow for about six months), and left-fallow land (not plowed for about 10 years). Each soil sample was investigated for its organic matter content and underwent a three-phase distribution and aggregate analysis of soil particles. In each case, soil erosion was measured. The result showed that soil from the fallow land had suffered the least erosion. The result recommends that maintaining minumum tillage practices in fallow condions could be more effective from the standpoint of soil conservation rather than regular tillage practices as in the case of the tilled land.

Journal

  • Papers on Environmental Information Science

    Papers on Environmental Information Science ceis22(0), 523-528, 2008

    Center for Environmental Information Science

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