Effects of nitrogen addition on the branch CO<sub>2</sub> efflux of <i>Larix principis-rupprechtii</i>

Hao Guobao; Wang Lidong; Li Yan; Li Fan; Cui Jingting; Jia Zhongkui

doi:10.12171/j.1000-1522.20220336

Journal of Beijing Forestry University > 2023 > 45(10): 28-35. > DOI: 10.12171/j.1000-1522.20220336

Hao Guobao, Wang Lidong, Li Yan, Li Fan, Cui Jingting, Jia Zhongkui. Effects of nitrogen addition on the branch CO₂ efflux of Larix principis-rupprechtii[J]. Journal of Beijing Forestry University, 2023, 45(10): 28-35. DOI: 10.12171/j.1000-1522.20220336

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Effects of nitrogen addition on the branch CO₂ efflux of Larix principis-rupprechtii

1.
State Key Laboratory of Efficient Production of Forest Resources, Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, China
2.
The Forestry Prospect and Design Institute of Hubei Province, Wuhan 430075, Hubei, China
3.
Saihanba Mechanized Forest Farm of Hebei Province, Weichang 068466, Hebei, China

More Information

Received Date: August 11, 2022
Revised Date: September 12, 2022
Accepted Date: July 06, 2023
Available Online: July 09, 2023

Graphical Abstract

Abstract

Abstract

Objective
Branch CO₂ efflux is one of the important components of stand carbon release. Studying the change of branch CO₂ efflux of Larix principis-rupprechtii under simulated nitrogen deposition could provide a theoretical basis for the management of carbon sequestration and sink increase of L. principis-rupprechtii forest under the background of nitrogen deposition.
Method
25-year-old and 32-year-old plantations of L. principis-rupprechtii were selected. Four nitrogen addition treatments, i.e. control (CK, 0 kg/(ha·year)), low nitrogen (N1, 75 kg/(ha·year)), medium nitrogen (N2, 150 kg/(ha·year)) and high nitrogen (N3, 225 kg/(ha·year)) were set. From June to October in 2021, the branch CO₂ efflux was monitored in situ using LI-8100A, and the branch samples were collected to determine the nitrogen content.
Result
(1) The CO₂ efflux and air temperature of L. principis-rupprechtii branches basically showed a “single-peak” monthly change, and the peak appeared from June to August. The air temperature could explain the changes of branch CO₂ efflux of two stands by 37%−82% and 40%−70%, respectively.(2) The average branch CO₂ efflux of L. principis-rupprechtii at 25-year-old and 32-year-old from June to October showed an increasing trend with the increase of N addition intensity, but only differed significantly under N3 treatment (P < 0.05). The CO₂ efflux of CK, N1 and N2 treatments at 25-year-old was significantly higher than that at 32-year-old (P < 0.05). The temperature sensitivity (Q₁₀) of branch CO₂ efflux was decreased by N addition except for 32-year-old plantations under N1 treatment. (3) Nitrogen addition significantly increased the 25-year-old branch nitrogen content; there was no significant change in shoot nitrogen content in 32-year-old branch nitrogen content (P > 0.05). There was a significantly negative linear relationship between the branch CO₂ efflux of L. principis-rupprechtii and the branch nitrogen content at both ages (P < 0.01). The nitrogen content can explain 16% (25-year-old) and 32% (32-year-old) variation of branch CO₂ efflux.
Conclusion
The branch CO₂ efflux is affected by air temperature, nitrogen addition and forest age. All three factors should be considered when constructing a tree carbon release model of L. principis-rupprechtii.
- nitrogen addition,
- Larix principis-rupprechtii,
- branch CO₂ efflux,
- nitrogen content

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References (40)

References

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Effects of nitrogen addition on the branch CO₂ efflux of Larix principis-rupprechtii