2003 Fiscal Year Final Research Report Summary
Development of a chamber system to measure entropy balance of artificial ecosystems
| Project/Area Number |
12356007
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
生物環境
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KURATA Kenji The University of Tokyo, Graduate School of Agricultural and Life Sciences, Professor, 大学院・農学生命科学研究科, 教授 (90161736)
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| Co-Investigator(Kenkyū-buntansha) |
SEKI Hirakazu Kanazawa University, Faculty of Engineering, Professor, 工学部, 教授 (90115246)
KANEKO Keiko The University of Tokyo, Graduate School of Agricultural and Life Sciences, Assistant, 大学院・農学生命科学研究科, 助手 (50332599)
FUJIWARA Kazuhiro The University of Tokyo, Graduate School of Agricultural and Life Sciences, Associate Professor, 大学院・農学生命科学研究科, 助教授 (30211535)
KOZAI Toyoki Chiba University, Faculty of Horticulture, Professor, 園芸学部, 教授 (90081570)
IBARAKI Yasuomi Yamaguchi University, Faculty of Agriculture, Associate Professor, 農学部, 助教授 (50242160)
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| Project Period (FY) |
2000 – 2003
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| Keywords | chamber / ecosystem / Second Law of Thermodynamics / evapotranspiration / plant canopy / logwave radiation / 長波放射 |
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| Research Abstract |
The First Law of Thermodynamics (heat balance) has been successfully applied to ecosystem studies and has brought about fruitful results on e.g., mechanism of microclimate within and above the ecosystems. On the contrary, the Second Law of Thermodynamics, which is closely related to entropy, has almost been ignored, except for some pioneering studies. This study aimed at developing a chamber system, called ENTRON, which could measure entropy production rate of plants within the chamber.ENTRON measured mass inflow, mass outflow, energy inflow and energy outflow into and out of the chamber. From these measurements entropy inflow and outflow were calculated and the entropy production within the chamber was evaluated based on the entropy balance of the space within the chamber. No measurements are free from errors, and ENTRON's error percentage in entropy production evaluation was about 5%. Most of entropy production in the case of plants within it could be attributed to that associated with evapotranspiration. ENTRON will be a powerful tool to analyze entropy production characteristics of plants. Based on the knowledge acquired from ENTRON experiments, entropy balance at natural ecosystems were evaluated. In some cases upwards longwave radiation was also important in the entropy balance.
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