Canopy and understory nitrogen addition increase the xylem tracheid size of dominant broadleaf species in a subtropical forest of China

Jiang, Xinyu; Liu, Nan; Lu, Xiankai; Huang, Jian‐Guo; Cheng, Jie; Guo, Xinwu; Wu, Shuhua

doi:10.1016/j.scitotenv.2018.06.133

Cited by 21 publications

(12 citation statements)

References 62 publications

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“…First, plants may become more sensitive to drought under higher N deposition (Gessler, Schaub, & McDowell, 2017), as they need to modify their hydraulic architecture to meet the higher requirement of water. Indeed, there are reports that the sizes of vessel and tracheid were increased significantly by N addition (Jiang et al, 2018; Lovelock et al, 2006; Wang et al, 2016). Furthermore, a meta‐analysis reported that plant hydraulic conductivity was enhanced significantly, and water potential corresponding to 50% loss of hydraulic conductivity ( P 50 ) became less negative under N addition (Zhang et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Section: Implications For Plant Carbon and Water Processesmentioning

confidence: 99%

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Global response patterns of plant photosynthesis to nitrogen addition: A meta‐analysis

Liang

Zhang

et al. 2020

Global Change Biology

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A mechanistic understanding of plant photosynthetic response is needed to reliably predict changes in terrestrial carbon (C) gain under conditions of chronically elevated atmospheric nitrogen (N) deposition. Here, using 2,683 observations from 240 journal articles, we conducted a global meta-analysis to reveal effects of N addition on 14 photosynthesis-related traits and affecting moderators. We found that across 320 terrestrial plant species, leaf N was enhanced comparably on mass basis (N mass , +18.4%) and area basis (N area , +14.3%), with no changes in specific leaf area or leaf mass per area. Total leaf area (TLA) was increased significantly, as indicated by the increases in total leaf biomass (+46.5%), leaf area per plant (+29.7%), and leaf area index (LAI, +24.4%). To a lesser extent than for TLA, N addition significantly enhanced leaf photosynthetic rate per area (A area , +12.6%), stomatal conductance (g s , +7.5%), and transpiration rate (E, +10.5%). The responses of A area were positively related with that of g s , with no changes in instantaneous water-use efficiency and only slight increases in long-term water-use efficiency (+2.5%) inferred from 13 C composition. The responses of traits depended on biological, experimental, and environmental moderators. As experimental duration and N load increased, the responses of LAI and A area diminished while that of E increased significantly. The observed patterns of increases in both TLA and E indicate that N deposition will increase the amount of water used by plants. Taken together, N deposition will enhance gross photosynthetic C gain of the terrestrial plants while increasing their water loss to the atmosphere, but the S U PP O RTI N G I N FO R M ATI O N Additional supporting information may be found online in the Supporting Information section. How to cite this article: Liang X, Zhang T, Lu X, et al. Global response patterns of plant photosynthesis to nitrogen addition: A meta-analysis. Glob Change Biol. 2020;26:3585-3600. https://doi.

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Section: Discussionmentioning

confidence: 99%

Section: Implications For Plant Carbon and Water Processesmentioning

confidence: 99%

Global response patterns of plant photosynthesis to nitrogen addition: A meta‐analysis

Liang

Zhang

et al. 2020

Global Change Biology

Self Cite

173

129

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“…Actually, significant differences in the quality and the quantity of N reaching soil surface are found between the CAN and the UAN experiments due to canopy N retention, interception, absorption, and transformation [18]. As suggested by previous studies [19][20][21], the traditional understory N deposition stimulating atmospheric N deposition could not fully reflect the actual effects of increasing atmospheric N deposition on forest ecological functions and processes. Therefore, canopy N deposition may overcome these limitations of understory N deposition.…”

Section: Introductionmentioning

confidence: 87%

Consistent Effects of Canopy vs. Understory Nitrogen Addition on Soil Respiration and Net Ecosystem Production in Moso Bamboo Forests

Cai

Yang

Liang

et al. 2021

Forests

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Nitrogen (N) deposition has been well documented to cause substantial impacts on ecosystem carbon cycling. However, the majority studies of stimulating N deposition by direct N addition to forest floor have neglected some key ecological processes in forest canopy (e.g., N retention and absorption) and might not fully represent realistic atmospheric N deposition and its effects on ecosystem carbon cycling. In this study, we stimulated both canopy and understory N deposition (50 and 100 kg N ha−1 year−1) with a local atmospheric NHx:NOy ratio of 2.08:1, aiming to assess whether canopy and understory N deposition had similar effects on soil respiration (RS) and net ecosystem production (NEP) in Moso bamboo forests. Results showed that RS, soil autotrophic (RA), and heterotrophic respiration (RH) were 2971 ± 597, 1472 ± 579, and 1499 ± 56 g CO2 m−2 year−1 for sites without N deposition (CN0), respectively. Canopy and understory N deposition did not significantly affect RS, RA, and RH, and the effects of canopy and understory N deposition on these soil fluxes were similar. NEP was 1940 ± 826 g CO2 m−2 year−1 for CN0, which was a carbon sink, indicating that Moso bamboo forest the potential to play an important role alleviating global climate change. Meanwhile, the effects of canopy and understory N deposition on NEP were similar. These findings did not support the previous predictions postulating that understory N deposition would overestimate the effects of N deposition on carbon cycling. However, due to the limitation of short duration of N deposition, an increase in the duration of N deposition manipulation is urgent and essential to enhance our understanding of the role of canopy processes in ecosystem carbon fluxes in the future.

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“…The experimental system and plots were described previously by Zhang et al. (2015) and detailed by some researchers (Jiang et al., 2018). In brief, both CAN and UAN involved three rates of N addition, that is, 0, 25 and 50 kg N ha −1 year –1 ; these were in addition to background, natural N deposition.…”

Section: Methodsmentioning

confidence: 99%

Addition of nitrogen to canopy versus understorey has different effects on leaf traits of understorey plants in a subtropical evergreen broad‐leaved forest

et al. 2020

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Atmospheric nitrogen (N) deposition has substantial effects on forest ecosystems. The effects of N deposition on understorey plants have been simulated by spraying N on the forest floor. Such understorey addition of N (UAN) might simulate atmospheric N deposition in a biased manner, because it bypasses the canopy. We compared the effects of UAN and canopy addition of N (CAN) at 0, 25 and 50 kg N ha−1 year–1 on SLA, leaf construction costs (CC), concentrations of leaf carbon ([C]), nitrogen ([N]), phosphorus ([P]), minerals ([Mineral]), nitrate ([NO3‐]), lignin ([Lignin]), lipids ([Lipid]), organic acids ([OA]), soluble phenolics ([SP]), total non‐structural carbohydrates ([TNC]) and total structural carbohydrates ([TSC]) in six dominant understorey species in a subtropical evergreen forest after 5 years of N treatments. We found that leaf CC, [C], [Lignin], [OA], [TNC] and [TSC] were significantly affected by N addition approach and rate, but leaf [P] and [Lipid] were affected by N addition approach and N addition rate respectively; leaf CC, [C], [P], [OA] and [TNC] were significantly lower under UAN than under CAN, but leaf [TSC] and [Lignin] were significantly higher and lower, respectively, under UAN than under CAN at 50 kg N ha−1 year–1; the decline of leaf [C] and [Lignin] contributed to the significantly lower leaf CC under UAN than under CAN. Synthesis. We show that canopy and understorey N addition exerted significantly different effects on leaf traits of understorey plants. The results indicate that understorey plants in subtropical forest respond differently to UAN from those to atmospheric deposition of N. Further studies are warranted to evaluate the unbiased ecological processes and functions of forest ecosystem responding to atmospheric N deposition via both CAN and UAN experiments over a longer term.

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Canopy and understory nitrogen addition increase the xylem tracheid size of dominant broadleaf species in a subtropical forest of China

Cited by 21 publications

References 62 publications

Global response patterns of plant photosynthesis to nitrogen addition: A meta‐analysis

Global response patterns of plant photosynthesis to nitrogen addition: A meta‐analysis

Consistent Effects of Canopy vs. Understory Nitrogen Addition on Soil Respiration and Net Ecosystem Production in Moso Bamboo Forests

Addition of nitrogen to canopy versus understorey has different effects on leaf traits of understorey plants in a subtropical evergreen broad‐leaved forest

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