Effects of night warming on the uptake of inorganic nitrogen by two dominant species in subalpine coniferous forests

Bo, Tang; Yang, Huan; Yin, Chunying; Sun, Yuyu; Zheng, Dong-Hui; Liu, Qing

doi:10.17521/cjpe.2015.0420

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…In support of our H1, the results showed that P. asperata had a higher inorganic N‐uptake rate than A. faxoniana under interspecific interaction, especially in the middle of the growing season (Table S2; Figure 3); these findings were consistent with those of a previous study on single planting (Tang et al, 2016). As demonstrated in previous studies, root traits are important factors influencing plant growth and N uptake, and the distinctive root traits of plants determine their individual N‐uptake capacity (Caplan et al, 2019; Sun et al, 2020; Figure 7).…”

Section: Discussionsupporting

confidence: 92%

Plant–plant interactions affect seasonal nitrogen uptake of subalpine conifer seedlings by altering root traits and soil nitrogen availabilities

Xie,

Hu,

et al. 2024

Physiologia Plantarum

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Although it is known that plant–plant interaction is an important factor influencing plant nitrogen (N) uptake and biomass productivity, its effects on seasonal inorganic N uptake, preference, and allocation remain unclear. In this study, two conifer species (Picea asperata and Abies faxoniana) were planted in three different planting modes (i.e., single, intraspecific, and interspecific interaction). Using 15N stable isotope tracer, we quantified plant biomass, ammonium (NH4+), and nitrate (NO3−) uptake rate (mass) and allocation in the middle (July) and the end (September) of the growing season, respectively, followed by analyses of root traits and soil properties so as to explore the underlying mechanism. Across the two seasons, intraspecific interaction decreased plant biomass and inorganic N‐uptake rate, which triggered intense competition for both species. Intraspecific competition of P. asperata was stronger than that of A. faxoniana. In contrast, interspecific interaction revealed significant facilitative effects on A. faxoniana, particularly in September. From the middle to the late growing season, the inorganic N‐uptake rate of P. asperata reduced, whereas that of A. faxoniana increased under interspecific interaction. The seasonal variation in plant N uptake was regulated by changes in root traits (such as root nitrogen concentration, specific root length, and branching intensity) and soil N availabilities. Both species indicated a preference for NO3− across seasons. Furthermore, we observed that 15N allocation to shoots of A. faxoniana under interspecific interaction was higher than that of P. asperata and declined from July to September. These findings on how plant–plant interactions affect plant N uptake seasonally can facilitate our understanding of species co‐existence and community assembly in forest ecosystems.

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Section: Discussionsupporting

confidence: 92%

Plant–plant interactions affect seasonal nitrogen uptake of subalpine conifer seedlings by altering root traits and soil nitrogen availabilities

Xie,

Hu,

et al. 2024

Physiologia Plantarum

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Interactions between species change the uptake of ammonium and nitrate in Abies faxoniana and Picea asperata

Liu

et al. 2021

Tree Physiology

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Plant nitrogen (N) uptake is affected by plant–plant interactions, but the mechanisms remain unknown. 15N-labeled technique was used in a pot experiment to analyze the uptake rate of ammonium (NH4+) and nitrate (NO3−) by Abies faxoniana and Picea asperata in single-plant mode, intraspecific and interspecific interactions. The results indicated that the effects of plant–plant interactions on N uptake rate depended on plant species and N forms. P. asperata had a higher N uptake rate of both N forms than A. faxoniana, and both species preferred NO3−. Compared with single-plant mode, intraspecific interaction increased NH4+ uptake for A. faxoniana but reduced that for P. asperata, while it did not change NO3− uptake for two species. The interspecific interaction enhanced N uptake of both N forms for A. faxoniana but did not affect the P. asperata, compared with single-plant mode. NH4+ and NO3− uptake rates for two species were regulated by root N concentration, root nitrate reductase activity, root vigor, soil pH, and soil N availability under plant–plant interactions. Decreased NH4+ uptake rate for P. asperata under intraspecific interaction was induced by lower root N concentration and nitrate reductase activity. The positive effects of interspecific interaction on N uptake for A. faxoniana could be determined mainly by positive rhizosphere effects, such as high soil pH. From the perspective of root-soil interactions, our study provides insight into how plant–plant interactions affect N uptake, which can help to understand species coexistence and biodiversity maintenance in forest ecosystems.

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Effects of night warming on the uptake of inorganic nitrogen by two dominant species in subalpine coniferous forests

Cited by 2 publications

References 13 publications

Plant–plant interactions affect seasonal nitrogen uptake of subalpine conifer seedlings by altering root traits and soil nitrogen availabilities

Plant–plant interactions affect seasonal nitrogen uptake of subalpine conifer seedlings by altering root traits and soil nitrogen availabilities

Interactions between species change the uptake of ammonium and nitrate in Abies faxoniana and Picea asperata

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