書誌事項
- タイトル別名
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- Estimation of Temporal Change and Spatial Variability in CO_2 Efflux from the Soil Surface of Agricultural Fields
- ノウチ ドジョウ カラ タイキ エノ ニサンカ タンソ ガス ハッセイリョウ ノ ヘンドウセイ ト ソノ ヒョウカ
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抄録
Information on temporal change and spatial variability of gas behavior in the surface soil is important to estimate the total gas efflux from an agricultural field to the atmosphere accurately. The objectives of this study were to clarify the relationships between the cultivation type and the temporal change and spatial variability of the CO_2 efflux from the agricultural fields and the effect of the gas diffusion movement and the soil physical properties on the gas efflux. The CO_2 efflux from the soil surface was measured by a closed chamber method at four agricultural fields in Japan, two bared fields after plowing, one dent-corn field and one pasture. The measurements of the gas efflux from the soil surface were carried out simultaneously at 10 points along a straight line with 3m intervals in each of the four fields. The gas diffusion fluxes through the surface soil were also estimated from the vertical gradients of gas concentrations and gas diffusion coefficient measured at the same 10 points where the gas efflux was measured. Both the average values and the coefficients of variance for the measured CO_2 efflux showed a tendency to decrease with time after plowing except in the pasture. This tendency is considered to be by the non-uniform activation of soil microorganisms caused by soil disturbance. Contrarily, those two values for the pasture increased with time and it could be explained in terms of the non-uniform growth of plant roots. In pasture, the measured gas efflux from the soil surface was larger than the estimated values of the gas diffusion flux through the surface soil. It could be explained by the gas generation by the roots. In the dent-corn field, on the other hand, the diffusion gas flux was larger than the gas efflux.
収録刊行物
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- 日本土壌肥料学雑誌
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日本土壌肥料学雑誌 78 (5), 487-495, 2007
一般社団法人 日本土壌肥料学会
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詳細情報 詳細情報について
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- CRID
- 1390001206556692480
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- NII論文ID
- 110006570335
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- NII書誌ID
- AN00195767
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- ISSN
- 24240583
- 00290610
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- NDL書誌ID
- 8973451
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可