2023 Fiscal Year Final Research Report
Elevational changes in production and soil respiration rates in subalpine forests
| Project/Area Number |
21K06331
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 45040:Ecology and environment-related
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| Research Institution | Shinshu University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 土壌呼吸 / 競争 / 森林動態 |
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| Outline of Final Research Achievements |
We investigated the production and soil respiration rate of subalpine forests along an elevation gradient. (1) The results showed that growth decreased due to competition at all elevations, and that the growth rate was positively correlated with the temperature during the growth period and negatively correlated with the precipitation. Furthermore, a decrease in growth rate increased the mortality rate. (2) Soil respiration rate at each elevation could be estimated from soil temperature, soil moisture, and forest biomass. (3) At all elevations, root respiration rate and microbial respiration rate were positively correlated with soil temperature. Fine root mass decreased with higher elevations, but it was revealed that root respiration rate per fine root mass was higher at higher elevations. (4) Seasonal and diurnal variations in soil respiration rates could be reproduced by soil temperature and soil moisture.
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| Free Research Field |
植物生態学
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| Academic Significance and Societal Importance of the Research Achievements |
この研究では，樹木個体の成長率，死亡率，そして土壌呼吸速度を森林のバイオマス，個体間競争と気象条件から推定できることを示した．樹木個体の成長率と死亡率に対する気象の影響については，まだデータ数が少ないため，推定精度は高くないが，今後，データを積み上げることで，より精度が高まることが期待される．樹木の成長に対する気象の影響は年輪年代学的な手法でよく研究されてきたが，一般的に行われている毎木調査のデータから推定できれば，今後，多くの森林データに適用でき，また温暖化の影響予測にも利用できる．
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