Evaluation of the organic matter accumulation effect based on the measurement of water and gas movement inside and outside the artificial macropores using the shaft tillage method
| Project/Area Number |
20K15623
|
|---|
| Research Category |
Grant-in-Aid for Early-Career Scientists
|
| Allocation Type | Multi-year Fund |
|---|
| Review Section |
Basic Section 41030:Rural environmental engineering and planning-related
|
|---|
| Research Institution | Saga University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2020-04-01 – 2023-03-31
|
| Project Status |
Completed (Fiscal Year 2022)
|
| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
|
|---|
| Keywords | 人工マクロポア / CO2 / 有機物分解 / 土壌ガス / 黒ボク土 / HP1 / 局所耕うん法 / 選択流 / ガス移動 / 密集根群 / 二酸化炭素ガス |
|---|
| Outline of Research at the Start |
農地に人工的に作成した鉛直間隙（人工マクロポア）を用いた局所耕うん法は，土壌有機物（SOM）の蓄積効果が知られている不耕起栽培法の改良法である．その特徴として，人工マクロポア内に形成する密生した根群（密集根群）を介した選択的な水分下方浸透がある．この水分下方浸透に伴うSOM蓄積増加効果の報告はあるが，その検証は十分でなく，人工マクロポア内の局所的な水・ガス移動計測に基づく検証は行われていない．
本研究では，水分・ガス移動の観点からSOM蓄積効果を解明することで，局所耕うん法が及ぼすSOM増加量の影響について検討する．
|
| Outline of Final Research Achievements |
By extending the original implementation plan, the following three research outcomes are summarized:
「I. Cultivation experiments using Andisol, II. Relationship between artificial macropores and SOM (Soil Organic Matter) accumulation, III. 2D water movement analysis using Hydrus2D」Using the shaft tillage method, we measured the two-dimensional water flow, evapotranspiration, and CO2 concentration changes in the artificial macropore. To model organic matter decomposition, we developed and evaluated a CO2 concentration measurement system.
|
| Academic Significance and Societal Importance of the Research Achievements |
本研究は，局所耕うん法における人工マクロポアが及ぼす水・炭素循環機構の要因を明
らかにする点に学術的意義がある．本研究の成果により，局所耕うん法の地球温暖化軽減効果に繋がるような，人工マクロポア内のガス動態の実態把握が可能になった．
|
Report
(4 results)
Research Products
(18 results)
