Canopy nitrogen deposition enhances soil ecosystem multifunctionality in a temperate forest

Yang, An; Zhu, Dong; Zhang, Weixin; Shao, Yuanhu; Shi, Yu; Liu, Xu; Lu, Ziluo; Zhu, Yong‐Guan; Wang, Hongtao; Fu, Shenglei

doi:10.1111/gcb.17250

Cited by 4 publications

(2 citation statements)

References 100 publications

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“…Whereafter, the composition of soil microbial community could be altered. Yang et al (2024) reported that the relative abundance of microbial genes involved in C degradation and fixation were enhanced by canopy not understory N addition. In contrast, understory N addition increases soil available N, which allows more N uptake without the need for more fine roots (Eastman et al, 2021;Li et al, 2021).…”

Section: Differentiated Responses Of Soil Microbial Residues To N Add...mentioning

confidence: 99%

“…The mode of N additions also affects the magnitude of N-induced changes in soil physicochemical properties and plant chemical properties (Li et al, 2021;Lu et al, 2021). At same site, Yang et al (2024) have recently shown that the relative abundances and alpha diversity of soil fungal and bacterial community (family level) differently responded to N addition modes. Yet, how different N addition modes affect soil MRC remains unexplored.…”

Section: Introductionmentioning

confidence: 99%

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Canopy and understory nitrogen additions differently affect soil microbial residual carbon in a temperate forest

Chen,

Zhang,

Zhang

et al. 2024

Global Change Biology

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Atmospheric nitrogen (N) deposition in forests can affect soil microbial growth and turnover directly through increasing N availability and indirectly through altering plant‐derived carbon (C) availability for microbes. This impacts microbial residues (i.e., amino sugars), a major component of soil organic carbon (SOC). Previous studies in forests have so far focused on the impact of understory N addition on microbes and microbial residues, but the effect of N deposition through plant canopy, the major pathway of N deposition in nature, has not been explicitly explored. In this study, we investigated whether and how the quantities (25 and 50 kg N ha−1 year−1) and modes (canopy and understory) of N addition affect soil microbial residues in a temperate broadleaf forest under 10‐year N additions. Our results showed that N addition enhanced the concentrations of soil amino sugars and microbial residual C (MRC) but not their relative contributions to SOC, and this effect on amino sugars and MRC was closely related to the quantities and modes of N addition. In the topsoil, high‐N addition significantly increased the concentrations of amino sugars and MRC, regardless of the N addition mode. In the subsoil, only canopy N addition positively affected amino sugars and MRC, implying that the indirect pathway via plants plays a more important role. Neither canopy nor understory N addition significantly affected soil microbial biomass (as represented by phospholipid fatty acids), community composition and activity, suggesting that enhanced microbial residues under N deposition likely stem from increased microbial turnover. These findings indicate that understory N addition may underestimate the impact of N deposition on microbial residues and SOC, highlighting that the processes of canopy N uptake and plant‐derived C availability to microbes should be taken into consideration when predicting the impact of N deposition on the C sequestration in temperate forests.

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Section: Differentiated Responses Of Soil Microbial Residues To N Add...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Canopy and understory nitrogen additions differently affect soil microbial residual carbon in a temperate forest

Chen,

Zhang,

Zhang

et al. 2024

Global Change Biology

Self Cite

View full text Add to dashboard Cite

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Research on Ecosystem Service Trade-Offs and Synergies in Spatial - Temporal Differentiation in Taihang Mountainous, China

Qu,

Zhang,

Niu

et al. 2024

Preprint

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Effects of Nitrogen Deposition and Precipitation Patterns on Nitrogen Allocation of Mongolian Pine (Pinus sylvestris var. mongolica) on Sandy Land Using 15N Isotope

Zhao,

Cheng,

Gang

et al. 2024

Agriculture

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In the context of global climate change, atmospheric nitrogen deposition is increasing, and precipitation patterns are becoming more variable. This study examines the impact of these changes on nitrogen (N) allocation mechanisms in semi-arid region tree species using one-year-old Mongolian pine (Pinus sylvestris var. mongolica) seedlings. The seedlings were planted in soil collected from the Daqinggou Sandy Ecological Experiment Station (42°54′ N, 122°25′ E). Three moisture treatments were applied (WC (normal moisture, approximately 65% ± 2.5% of the field capacity), WI (30% increased moisture), and WD (30% decreased moisture)), as well as three nitrogen treatments (NC (no nitrogen), NL (5 g·m−2·y−1 nitrogen), and NH (10 g·m−2·y−1 nitrogen)). The seedlings were sprayed with a 15N-labeled CH4N2O solution (46% N, 15N abundance 10.14%) in a pot trial, with samples taken in August and October to measure N content and 15N abundance in the seedling organs and the soil. Parameters such as Ndff (%) (the percentage of nitrogen derived from fertilizer), nitrogen content of organs, 15N absorption in organs, and 15N distribution ratio were calculated. The results showed that 15N allocation in seedlings followed the trend leaves > stems > roots. Under moisture treatments, 15N allocation ratios in leaves, stems, and roots were 63.63–71.42%, 14.89–24.14%, and 12.23–14.88% under low nitrogen, and 62.63–77.83%, 13.35–22.90%, and 7.31–19.18% under high nitrogen. Significant correlations were found in 15N abundance among the seedling organs, with coefficients ranging from 0.97 to 1.00. The main effects of moisture and nitrogen, as well as their interaction, significantly impacted 15N abundance in the seedling organs. Changes in moisture levels affected the nitrogen absorption capacity of Mongolian pine. Increased moisture significantly enhanced 15N absorption in all organs, leading to 62.63–71.42% of 15N being allocated to the leaves, maintaining an appropriate proportion with the roots and stems. Nitrogen deposition altered the nitrogen allocation strategy among different organs of Mongolian pine. Under conditions of reduced moisture and low nitrogen, a greater proportion of nitrogen was captured by the roots and stems, with an allocation increase of approximately 4.98–5.77% compared to the control group, thereby mitigating the adverse effects of water deficiency. In conditions of reduced moisture and high nitrogen, the leaves, being active organs, accumulated more limiting elements, with an increase in nitrogen allocation of 2.03–8.07% compared to the control group. To achieve an optimal allocation strategy, moderate nitrogen deposition combined with increased moisture enhanced nitrogen uptake in Mongolian pine seedlings. This study provides scientific evidence for ecological restoration, wind erosion control, and agricultural and forestry management in semi-arid regions under the context of global climate change.

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Canopy nitrogen deposition enhances soil ecosystem multifunctionality in a temperate forest

Cited by 4 publications

References 100 publications

Canopy and understory nitrogen additions differently affect soil microbial residual carbon in a temperate forest

Canopy and understory nitrogen additions differently affect soil microbial residual carbon in a temperate forest

Research on Ecosystem Service Trade-Offs and Synergies in Spatial - Temporal Differentiation in Taihang Mountainous, China

Effects of Nitrogen Deposition and Precipitation Patterns on Nitrogen Allocation of Mongolian Pine (Pinus sylvestris var. mongolica) on Sandy Land Using 15N Isotope

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