抄録
Wind machines are one of the most effective and prevalent methods of frost protection for crops. However, their physical and physiological effectiveness should be re-examined because climate change from global warming can reduce the cold tolerance of crops, leading to higher risk of frost damage. Here, we experimentally elucidate thermal effects of a wind machine by spatiotemporal analysis of leaf heat balance, with the aid of a new method facilitating continuous and multipoint evaluation of leaf boundary layer conductance (GA). GA regulates convective heat exchange between leaves and ambient air. This analysis was performed in a tea field with a frost protective fan (oscillating wind machine), thereby visualising the spatiotemporal distribution of thermal effects from the oscillating fan. Those effects showed a dynamically varying distribution in space and time, as shown in the supplementary animation, under strong influences of both changes in GA and air-to-leaf temperature difference. The change in GA was synchronised with airflow from the oscillating fan onto leaves. However, the change in air-to-leaf temperature difference was complicated, with delay in transient thermal responses of leaves and ambient air. These spatiotemporal characteristics of thermal effects varied substantially with field location, owing to different intervals and durations of airflow from the oscillating fan. Consequently, remarkable non-uniformities in thermal effects appeared across the field, increasing potential risk of frost damage. These results indicate that the effectiveness of the fan still has room for improvement by considering the spatiotemporal characteristics of thermal effects reported herein, toward more reliable frost protection under global warming.
| 元の言語 | 英語 |
|---|---|
| ページ（範囲） | 98-109 |
| ページ数 | 12 |
| ジャーナル | Biosystems Engineering |
| 巻 | 164 |
| DOI | |
| 出版物ステータス | 出版済み - 12 1 2017 |
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All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Food Science
- Animal Science and Zoology
- Agronomy and Crop Science
- Soil Science
これを引用
Dynamic distribution of thermal effects of an oscillating frost protective fan in a tea field. / Kimura, Kensuke; Yasutake, Daisuke; Nakazono, Kentaro; Masaharu, Kitano.
：: Biosystems Engineering, 巻 164, 01.12.2017, p. 98-109.研究成果: ジャーナルへの寄稿 › 記事
}
TY - JOUR
T1 - Dynamic distribution of thermal effects of an oscillating frost protective fan in a tea field
AU - Kimura, Kensuke
AU - Yasutake, Daisuke
AU - Nakazono, Kentaro
AU - Masaharu, Kitano
PY - 2017/12/1
Y1 - 2017/12/1
N2 - Wind machines are one of the most effective and prevalent methods of frost protection for crops. However, their physical and physiological effectiveness should be re-examined because climate change from global warming can reduce the cold tolerance of crops, leading to higher risk of frost damage. Here, we experimentally elucidate thermal effects of a wind machine by spatiotemporal analysis of leaf heat balance, with the aid of a new method facilitating continuous and multipoint evaluation of leaf boundary layer conductance (GA). GA regulates convective heat exchange between leaves and ambient air. This analysis was performed in a tea field with a frost protective fan (oscillating wind machine), thereby visualising the spatiotemporal distribution of thermal effects from the oscillating fan. Those effects showed a dynamically varying distribution in space and time, as shown in the supplementary animation, under strong influences of both changes in GA and air-to-leaf temperature difference. The change in GA was synchronised with airflow from the oscillating fan onto leaves. However, the change in air-to-leaf temperature difference was complicated, with delay in transient thermal responses of leaves and ambient air. These spatiotemporal characteristics of thermal effects varied substantially with field location, owing to different intervals and durations of airflow from the oscillating fan. Consequently, remarkable non-uniformities in thermal effects appeared across the field, increasing potential risk of frost damage. These results indicate that the effectiveness of the fan still has room for improvement by considering the spatiotemporal characteristics of thermal effects reported herein, toward more reliable frost protection under global warming.
AB - Wind machines are one of the most effective and prevalent methods of frost protection for crops. However, their physical and physiological effectiveness should be re-examined because climate change from global warming can reduce the cold tolerance of crops, leading to higher risk of frost damage. Here, we experimentally elucidate thermal effects of a wind machine by spatiotemporal analysis of leaf heat balance, with the aid of a new method facilitating continuous and multipoint evaluation of leaf boundary layer conductance (GA). GA regulates convective heat exchange between leaves and ambient air. This analysis was performed in a tea field with a frost protective fan (oscillating wind machine), thereby visualising the spatiotemporal distribution of thermal effects from the oscillating fan. Those effects showed a dynamically varying distribution in space and time, as shown in the supplementary animation, under strong influences of both changes in GA and air-to-leaf temperature difference. The change in GA was synchronised with airflow from the oscillating fan onto leaves. However, the change in air-to-leaf temperature difference was complicated, with delay in transient thermal responses of leaves and ambient air. These spatiotemporal characteristics of thermal effects varied substantially with field location, owing to different intervals and durations of airflow from the oscillating fan. Consequently, remarkable non-uniformities in thermal effects appeared across the field, increasing potential risk of frost damage. These results indicate that the effectiveness of the fan still has room for improvement by considering the spatiotemporal characteristics of thermal effects reported herein, toward more reliable frost protection under global warming.
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U2 - 10.1016/j.biosystemseng.2017.09.010
DO - 10.1016/j.biosystemseng.2017.09.010
M3 - Article
VL - 164
SP - 98
EP - 109
JO - Biosystems Engineering
JF - Biosystems Engineering
SN - 1537-5110
ER -