Response of functional traits of leaves and fine roots of <i>Populus euramericana</i> cv. ‘74/76’ saplings to ozone dose

Li Pin; Hou Xiaofan; Yin Rongbin

doi:10.12171/j.1000-1522.20210347

Journal of Beijing Forestry University > 2023 > 45(2): 49-57. > DOI: 10.12171/j.1000-1522.20210347

Li Pin, Hou Xiaofan, Yin Rongbin. Response of functional traits of leaves and fine roots of Populus euramericana cv. ‘74/76’ saplings to ozone dose[J]. Journal of Beijing Forestry University, 2023, 45(2): 49-57. DOI: 10.12171/j.1000-1522.20210347

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Response of functional traits of leaves and fine roots of Populus euramericana cv. ‘74/76’ saplings to ozone dose

1.
School of Forestry, Beijing Forestry University, Beijing 100083, China
2.
State Key Laboratory of Urban and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

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Received Date: September 04, 2021
Revised Date: November 07, 2021
Accepted Date: January 03, 2023
Available Online: January 06, 2023
Published Date: February 24, 2023

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Abstract

Abstract

Objective Poplar leaves and fine roots play a key role in the carbon and nutrient cycle (such as nitrogen and phosphorus) in the forest ecosystem. However, the response of fine roots to ozone (O₃) stress has been poorly studied, and the difference in responses of leaves and fine roots to O₃ is still unclear. This study thus aimed to clarify the difference in responses to O₃ dose of leaves and fine roots, two rapidly decomposing organs, and to provide reference for understanding the response mechanism of poplar to O₃ pollution from the perspective of aboveground and belowground feedback.
Method Five O₃ concentration levels were set with the open-top chambers to explore whether the functional traits of poplar leaves and fine roots respond differently to O₃ dose.
Result There was significant hormesis on the response of tannin content of leaves and P content of fine roots to O₃ stress, which showed a positive effect before toxicological O₃ threshold and a negative effect after toxicological O₃ threshold. Leaf saturated photosynthetic rate, fine root biomass and soluble sugar content of leaves and fine roots showed a toxicological O₃ threshold, but not significant hormesis. Water use efficiency and the biomass of leaves, stems, coarse roots and total roots decreased linearly with O₃ dose increasing. The ratio of fine roots to leaves in the content of C, N, soluble sugar, lignin, and lignin∶N did not change with O₃ dose increasing. The ratio of fine roots to leaves in the content of P, starch, and TNC increased with the O₃ dose increasing, while tannin content first declined and then rose with O₃ dose increasing (O₃ threshold value of 37.25 μmol/mol·h).
Conclusion These results indicate that the significant differences in the responses of leaves and fine roots to O₃ pollution will result in marked changes in the relative belowground roles of these two litter sources within poplar plantations. O₃ stress could induce more P and non-structural carbohydrates to fine roots for storage relative to leaves, which might be a coping strategy for poplar exposed to O₃ stress.
- O₃ stress,
- Populus euramericana cv. ‘74/76’,
- fine root,
- leaf,
- functional trait,
- dose response

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References (41)

References

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Response of functional traits of leaves and fine roots of Populus euramericana cv. ‘74/76’ saplings to ozone dose