| Plant canopies exhibit stronger thermoregulation capability at the seasonal than diurnal timescales | |
Guo, Zhengfei; Zhang, Kun1; Lin, Hua2 ; Majcher, Bartosz M.; Lee, Calvin K. F.; Still, Christopher J.; Wu, Jin4,5
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| 2023 | |
| Source Publication | AGRICULTURAL AND FOREST METEOROLOGY
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| ISSN | 0168-1923 |
| Volume | 339Issue:xPages:- |
| Abstract | Plant canopy temperature (T-c) plays a crucial role in regulating plant growth and metabolism. Although dominant controls on T-c are observed to differ across timescales, whether this would cause differences in plant thermoregulation capability (PTC) remains unclear, raising concerns about extrapolating findings on plant thermoregulation from one timescale to another. Here we constructed diurnal and seasonal datasets of T-c, air temperature (T-a), and other biotic and abiotic factors from global hourly flux data, and explored diurnal and seasonal variations in PTC (indicated by T-c vs. T-a regression slope, with lower slopes indicating higher T-c stability and stronger thermoregulation). Our result revealed significantly lower T-c vs. T-a slopes (i.e. stronger PTC) at seasonal than diurnal timescales, primarily due to different transpiration cooling at high T-a between the two timescales. At the diurnal timescale, transpiration rates initially increase before decreasing with T-a after reaching a specific temperature threshold (similar to 85th percentile of T-a; related to midday depression of stomatal activities); Conversely, at the seasonal timescale, transpiration rates consistently increase with T-a (related to the coincidence among high water availability and the peak annual T-a). PTC also displays considerable spatial variability, with latent heat vs. net radiation relationship and water availability being the dominant regulators. Collectively, we recommend caution when extrapolating thermoregulation-relevant conclusions drawn from short-term observations to longer-term predictions, and vice versa, since they have different patterns and underlying mechanisms. |
| Keyword | canopy temperature FLUXNET carbon cycle transpiration energy balance climate change |
| Subject Area | Agriculture ; Forestry ; Meteorology & Atmospheric Sciences |
| DOI | http://dx.doi.org/10.1016/j.agrformet.2023.109582 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:001033049700001 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | https://ir.xtbg.ac.cn/handle/353005/13876 |
| Collection | 2012年后新成立研究组 |
| Affiliation | 1.Univ Hong Kong, Sch Biol Sci, Res Area Ecol & Biodivers, Hong Kong, Peoples R China 2.Univ Hong Kong, Dept Math, Hong Kong, Peoples R China 3.Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Xishuangbanna 666303, Peoples R China 4.Still, Christopher J.] Oregon State Univ, Forest Ecosyst & Soc, Corvallis, OR 97331 USA 5.Univ Hong Kong, Inst Climate & Carbon Neutral, Hong Kong, Peoples R China 6.Univ Hong Kong, Sch Biol Sci, Pokfulam Rd, Hong Kong, Peoples R China |
| Recommended Citation GB/T 7714 | Guo, Zhengfei,Zhang, Kun,Lin, Hua,et al. Plant canopies exhibit stronger thermoregulation capability at the seasonal than diurnal timescales[J]. AGRICULTURAL AND FOREST METEOROLOGY,2023,339(x):-. |
| APA | Guo, Zhengfei.,Zhang, Kun.,Lin, Hua.,Majcher, Bartosz M..,Lee, Calvin K. F..,...&Wu, Jin.(2023).Plant canopies exhibit stronger thermoregulation capability at the seasonal than diurnal timescales.AGRICULTURAL AND FOREST METEOROLOGY,339(x),-. |
| MLA | Guo, Zhengfei,et al."Plant canopies exhibit stronger thermoregulation capability at the seasonal than diurnal timescales".AGRICULTURAL AND FOREST METEOROLOGY 339.x(2023):-. |
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| Plant canopies exhib（9269KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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