Levels and variations of soil bioavailable nitrogen among forests under high atmospheric nitrogen deposition

Sun, Zhong-Cong; Ma, Tianyi; Xu, Shi‐Qi; Guo, Haoran; Hu, Congcong; Chen, Chong-Juan; Song, Weihua; Liu, Xueyan

doi:10.1016/j.scitotenv.2022.156405

Cited by 7 publications

(3 citation statements)

References 112 publications

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“…1 and 2). The results of many studies also indicate this trend: soil NH 4 + -N, NO 3 − -N and TN contents increase with N addition [23][24][25]. The increase in inorganic N content indicates that N addition promotes the mineralization rate of organic N and converts nitrogenous organic matter in the soil into inorganic N, thus increasing the effective N content, which is available to plants and microorganisms.…”

Section: Effect Of Nitrogen Addition On Soil Chemistrymentioning

confidence: 86%

Nitrogen Deposition May Benefit to Larix olgensis Root Soils

Zhao

et al. 2023

Forests

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Atmospheric nitrogen deposition affects the health of forest ecosystems by altering soil microbial activity. However, the effects of nitrogen addition levels, morphology and ecosystem type on whether nitrogen addition is beneficial or detrimental to soil health is controver-sial, and most studies have focused on the negative effects on microbial structure. Based on this, this study conducted a four-year experiment of nitrogen (NaNO3) addition at two levels (10 and 20 kg N hm−2·yr−1) in the understory soil of Larix olgensis in northeastern China to study soil microbial properties, soil enzyme activities, and to analyze soil physi-cochemical properties and the correlation between them. The results showed that nitrogen addition reduced soil pH and increased soil NH4+-N and NO3−-N contents, thus promoting the activities of Urease (Ure), Acid phosphatase (ACP) and N-Acetamidoglucosidase (NAG) and inhibiting the activity of Leucine aminopeptidase (LAP) in soil, further improving the diversity and richness of soil microorganisms and increasing the dominant taxa of beneficial microorganisms. This may be due to soil acidification caused by the addition of nitrogen, which increases the effectiveness of nitrogen in the soil, improving soil properties, moving soil health in a beneficial direction, promoting beneficial microbial activity, and making the soil more suitable for the growth of the acid-loving tree species L. olgensis. In general, N addition favored the development of soil bacterial communities and the maintenance of soil nutrient status, and had a positive effect on the soil nutrient status of L. olgensis. The results of this study may provide an important scientific basis for adaptive management of forest ecosystems in the context of global nitrogen deposition.

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Section: Effect Of Nitrogen Addition On Soil Chemistrymentioning

confidence: 86%

Nitrogen Deposition May Benefit to Larix olgensis Root Soils

Zhao

et al. 2023

Forests

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“…It is interesting that the 𝐴𝐴 𝐴𝐴 t-NO 3 − (n-NO3 − ) increased with the increase of 𝐴𝐴 𝐴𝐴b-NO 3 − (Figure 6a). This elucidates that forest N enrichment enhanced the activity of nitrifying microbes and thus microbial 𝐴𝐴 NO3 − production in canopies (possibly via the accumulation of particulates and a fertilizing effect on canopy biota), which assembles the mechanism that increasing N deposition stimulates microbial nitrification processes in soils (Sun et al, 2022;Xu et al, 2021). Accordingly, we also found that the 𝐴𝐴 𝐴𝐴t-NO 3 − (gain) (the sum of 𝐴𝐴 𝐴𝐴 t-NO 3 − (p-NO3 − ) and 𝐴𝐴 𝐴𝐴 t-NO 3 − (n-NO3 − ) ) increased with the increasing 𝐴𝐴 𝐴𝐴b-NO 3 − (Figure 6b).…”

Section: Differing Precipitation-canopy 𝑨𝑨 No𝟑𝟑 − Exchanges Between B...mentioning

confidence: 75%

“…It is interesting that the

{D}_{\mathrm{t}\mbox{-}{{\text{NO}}_{3}}^{-}\left(\mathrm{n}\mbox{-}{{\text{NO}}_{3}}^{-}\right)}

increased with the increase of

{D}_{\mathrm{b}\mbox{-}{{\text{NO}}_{3}}^{-}}

(Figure 6a). This elucidates that forest N enrichment enhanced the activity of nitrifying microbes and thus microbial

{{\text{NO}}_{3}}^{-}

production in canopies (possibly via the accumulation of particulates and a fertilizing effect on canopy biota), which assembles the mechanism that increasing N deposition stimulates microbial nitrification processes in soils (Sun et al., 2022; Xu et al., 2021). Accordingly, we also found that the

{D}_{\mathrm{t}\mbox{-}{{\text{NO}}_{3}}^{-}(\text{gain})}

(the sum of

{D}_{\mathrm{t}\mbox{-}{{\text{NO}}_{3}}^{-}\left(\mathrm{p}\mbox{-}{{\text{NO}}_{3}}^{-}\right)}

and

{D}_{\mathrm{t}\mbox{-}{{\text{NO}}_{3}}^{-}\left(\mathrm{n}\mbox{-}{{\text{NO}}_{3}}^{-}\right)}

) increased with the increasing

{D}_{\mathrm{b}\mbox{-}{{\text{NO}}_{3}}^{-}}

(Figure 6b).…”

Section: Discussionmentioning

confidence: 88%

Isotope Constraints on Nitrate Exchanges Between Precipitation and Forest Canopy

Liu,

Qin

et al. 2023

Global Biogeochemical Cycles

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Atmospheric nitrogen (N) deposition is a key process influencing plant‐soil N processes and associated functions of forest ecosystems. However, the N deposition into soils based on open‐field precipitation observations remains inaccurate due to the unconstrained precipitation‐canopy N exchanges, which prevents a better evaluation of N deposition effects on forest N cycles and functions. Nitrate () is a major form of reactive N. Based on a data synthesis of fluxes and isotopes (15N, 17O, 18O) of atmospheric inputs in forests, here we constructed a new method to quantify fractions and fluxes of throughfall () contributors (nitrification () and particulates () in canopies, the original precipitation ()) and then constrain precipitation‐canopy exchanges (i.e., gains from canopy and losses due to canopy retention). Generally, was higher in fluxes but lower in N and O isotopes than , suggesting higher gains than losses and canopy nitrification as a gain contributor. 10%−18% and 40%−47% of were gained from canopy and , respectively, while 43% ± 25% and 20% ± 74% of the original were lost after passing through canopies of broadleaved and coniferous forests, respectively. Importantly, both gain and loss fluxes were found increasing with the fluxes. This work unlocked fractions and fluxes of major precipitation‐canopy exchange processes and revealed a stimulating mechanism of atmospheric pollution on precipitation‐canopy exchanges.

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Short-versus long-term effects of nitrogen addition and warming on soil nitrogen mineralization and leaching in a grass-dominated old field

Souriol,

Henry

2024

Oecologia

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Levels and variations of soil bioavailable nitrogen among forests under high atmospheric nitrogen deposition

Cited by 7 publications

References 112 publications

Nitrogen Deposition May Benefit to Larix olgensis Root Soils

Nitrogen Deposition May Benefit to Larix olgensis Root Soils

Isotope Constraints on Nitrate Exchanges Between Precipitation and Forest Canopy

Short-versus long-term effects of nitrogen addition and warming on soil nitrogen mineralization and leaching in a grass-dominated old field

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