Relationship of functional traits and site conditions with  \rmNO_3^ -  uptake capacity of tree root

Yu Miao; Zhang Bijia; Wang Zejin; Yu Fengzhen; Zhao Xinhang; Yang Jiarong; Li Pin; Fan Dayong; Xu Chengyang

doi:10.12171/j.1000-1522.20220497

Journal of Beijing Forestry University > 2024 > 46(1): 35-43. > DOI: 10.12171/j.1000-1522.20220497

Yu Miao, Zhang Bijia, Wang Zejin, Yu Fengzhen, Zhao Xinhang, Yang Jiarong, Li Pin, Fan Dayong, Xu Chengyang. Relationship of functional traits and site conditions with

${\rm{NO}}_{{3}}^ {{-}}$ uptake capacity of tree root[J]. Journal of Beijing Forestry University, 2024, 46(1): 35-43. DOI: 10.12171/j.1000-1522.20220497

Citation:

Yu Miao, Zhang Bijia, Wang Zejin, Yu Fengzhen, Zhao Xinhang, Yang Jiarong, Li Pin, Fan Dayong, Xu Chengyang. Relationship of functional traits and site conditions with

${\rm{NO}}_{{3}}^ {{-}}$ uptake capacity of tree root[J]. Journal of Beijing Forestry University, 2024, 46(1): 35-43. DOI: 10.12171/j.1000-1522.20220497

Yu Miao, Zhang Bijia, Wang Zejin, Yu Fengzhen, Zhao Xinhang, Yang Jiarong, Li Pin, Fan Dayong, Xu Chengyang. Relationship of functional traits and site conditions with

${\rm{NO}}_{{3}}^ {{-}}$ uptake capacity of tree root[J]. Journal of Beijing Forestry University, 2024, 46(1): 35-43. DOI: 10.12171/j.1000-1522.20220497

Citation:

Yu Miao, Zhang Bijia, Wang Zejin, Yu Fengzhen, Zhao Xinhang, Yang Jiarong, Li Pin, Fan Dayong, Xu Chengyang. Relationship of functional traits and site conditions with

${\rm{NO}}_{{3}}^ {{-}}$ uptake capacity of tree root[J]. Journal of Beijing Forestry University, 2024, 46(1): 35-43. DOI: 10.12171/j.1000-1522.20220497

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Relationship of functional traits and site conditions with ${\rm{NO}}_{{3}}^ {{-}}$ uptake capacity of tree root

1.
Research Center for Urban Forestry of Beijing Forestry University, Key Laboratory for Silviculture and Forest Ecosystem in Arid and Semi-Arid Area of National Forestry and Grassland Administration, Key Laboratory for Silviculture andConservation of Ministry of Education, Beijing 100083, China
2.
Capital Green Culture Forest of Steles Management Office, Beijing 100094, China
3.
School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China

More Information

Received Date: December 06, 2022
Revised Date: February 06, 2023
Accepted Date: December 17, 2023
Available Online: December 21, 2023

Graphical Abstract

Abstract

Abstract

Objective
Nutrient is an important limiting factor for tree growth in drought and barren sites, and the way trees absorbing and using nutrients in drought and barren sites determines their ecological adaptation strategies. In this paper, the kinetics of root nitrogen uptake and the coupling relationship between root morphological traits were measured in situ in the field, which laid a foundation for revealing the physiological function of trees in drought and barren environments.
Method
We took Prunus davidiana, Acer truncatum and Quercus variabilis in Baiwangshan Forest Park of Beijing as the research objectives. We used modified Hogland nutrient solution with ${\rm{NO}}_3^ -$ concentration gradients to carry out in-situ measurement of root ${\rm{NO}}_3^ -$ uptake kinetics in generally and extremely drought and barren site conditions, respectively. The relationship between root ${\rm{NO}}_3^ -$ uptake rate and root functional traits was analyzed by Pearson correlation and path analysis.
Result
Tree species, site conditions and the interaction of above two factors all had an significant or extremely significant effect on root ${\rm{NO}}_3^ -$ uptake rate and kinetic parameters. Three tree species all had high nitrogen affinity. The uptake rate of ${\rm{NO}}_3^ -$ in the root of A. truncatum was lower, and it was significantly lower than that of P. davidiana and Q. variabilis under the above two site conditions. Under the site conditions of more drought and barren, fast growing tree species had compensatory absorption of ${\rm{NO}}_3^ -$ . Root functional traits and the uptake rate of ${\rm{NO}}_3^ -$ had a good coupling relationship. The result showed that the morphological traits of specific root length (SRL) and specific root surface area (SRA) had significantly positive effects on ${\rm{NO}}_3^ -$ uptake rate of roots, while root diameter (RD) and root tissue density (RTD) had negative effects. In terms of branching structure traits, branching intensity and number of links had weak effects on ${\rm{NO}}_3^ -$ uptake rate.
Conclusion
The ${\rm{NO}}_3^ -$ uptake rate of P. davidiana and Q. variabilis with a faster growth rate decreases significantly under the extremely drought and barren site stress, while A. truncatum is the opposite. The “speed strategy” of increasing the maximum absorption rate and reducing nitrogen affinity ensures the compensatory absorption of ${\rm{NO}}_3^ -$ by the roots of fast-growing tree species. The combination of morphological traits with higher SRL, higher SRA, lower RD and lower RTD can effectively improve the uptake rate of ${\rm{NO}}_3^ -$ by roots in drought and barren sites.
- in situ test,
- site conditions,
- interspecific difference,
- NO⁻ ₃ uptake,
- functional trait,
- uptake kinetics

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References (40)

References

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Relationship of functional traits and site conditions with ${\rm{NO}}_{{3}}^ {{-}}$ uptake capacity of tree root