Chemistry of soil and foliage in declining sugar maple stands over 13 years of nitrogen addition

Moore, Jean-David; Houle, Daniel

doi:10.1016/j.foreco.2023.120897

Cited by 4 publications

(6 citation statements)

References 47 publications

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“…The total C and N concentrations were measured by dry combustion (LECO model TruMac). The soil pH was measured with a probe following the procedure described in Moore and Houle (2023) [43].…”

Section: Experimental Design Sampling Procedure and Chemical Analysesmentioning

confidence: 99%

Long-Term Simulated Nitrogen Deposition Has Moderate Impacts on Soil Microbial Communities across Three Bioclimatic Domains of the Eastern Canadian Forest

Renaudin

Khlifa

Legault

et al. 2023

Forests

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The soil microbiome plays major roles in the below-ground processes and productivity of forest ecosystems. Atmospheric nitrogen (N) deposition is predicted to increase globally and might create disturbances in soil microbial communities, essentially by modifying soil chemistry. However, the impacts of higher N deposition on the soil microbiome in N-limited northern forests are still unclear. For 16 years, we simulated N deposition by adding ammonium nitrate at rates of 3 and 10 times the ambient N deposition directly into soils located in three bioclimatic domains of the eastern Canadian forest (i.e., sugar maple–yellow birch, balsam fir–white birch, and black spruce–feather moss). We identified changes in the microbial communities by isolating the DNA of the L, F, and H soil horizons, as well as by sequencing amplicons of the bacterial 16S rRNA gene and the fungal ITS region. We found that long-term increased N deposition had no effect on soil microbial diversity, but had moderate impacts on the composition of the bacterial and fungal communities. The most noticeable change was the increase in ectomycorrhizal fungi ASV abundance, potentially due to increased tree root growth on fertilized plots. Our work suggests that, in N-limited northern forests, extra N is rapidly mobilized by vegetation, thus minimizing impacts on the soil microbiome.

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Section: Experimental Design Sampling Procedure and Chemical Analysesmentioning

confidence: 99%

Long-Term Simulated Nitrogen Deposition Has Moderate Impacts on Soil Microbial Communities across Three Bioclimatic Domains of the Eastern Canadian Forest

Renaudin

Khlifa

Legault

et al. 2023

Forests

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“…Such trends were not observed after 8 years of N addition on the same experimental sites (Houle & Moore, 2019), pointing to cumulative long‐term impacts of N treatment. A decrease in Ca 2+ and Mg 2+ in organic horizons was also observed following 13 years of N addition in an eastern Canadian sugar maple forest (Moore & Houle, 2023), but this site was heavily impacted by soil acidification. Soil Ca availability decreases with higher N deposition were attributed to NO 3 ‐induced Ca leaching in North American temperate forests (Hynicka et al, 2016).…”

Section: Discussionmentioning

confidence: 82%

“…The fertilization and sampling procedures were previously described in Moore and Houle (2023). In October 2000, nine experimental units of 10 × 10 m separated by at least 10 m were delimited on each site.…”

Section: Fertilization Experiments and Samplingmentioning

confidence: 99%

“…Available P concentration was determined using the Mehlich-3 method and total C and N contents were measured using dry combustion (LECO model TruMac). Finally, cation exchange capacity (CEC) and base saturation (BS) were calculated following the same procedure as in Moore and Houle (2023). Tree foliage samples were oven dried at 65 C and ground through a 250-μm mesh.…”

Section: Soil and Foliar Elemental Analysesmentioning

confidence: 99%

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Eastern Canadian boreal forest soil and foliar chemistry show evidence of resilience to long‐term nitrogen addition

Houle,

Moore,

Renaudin

2024

Ecological Applications

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The boreal forest is one of the world's largest terrestrial biome and plays crucial roles in global biogeochemical cycles, such as carbon (C) sequestration in vegetation and soil. However, the impacts of decades of N deposition on N‐limited ecosystems, like the eastern Canadian boreal forest, remain unclear. For 13 years, N deposition was simulated by periodically adding ammonium nitrate on soils of two boreal coniferous forests (i.e., balsam fir and black spruce) of eastern Canada, at low (LN) and high (HN) rates, corresponding to 3 and 10 times the ambient N deposition, respectively. We show that more than a decade of N addition had no strong effects on mineral soil C, N, P, and cation concentrations and on foliar total Ca, K, Mg, and Mn concentrations. In organic soil, C stock was not affected by N addition while N stock increased, and exchangeable Ca2+ and Mg2+ decreased at the balsam fir site under HN treatment. At both sites, LN treatment had nearly no impact on foliage and soil chemistry but foliar N and N:P significantly increased under HN treatment, potentially leading to foliar nutrient imbalance. Overall, our work indicates that, in the eastern Canadian boreal forest, soil and foliar nutrient concentrations and stocks are resilient to increasing N deposition potentially because, in the context of N limitation, extra N would be rapidly immobilized by soil micro‐organisms and vegetation. These findings could improve modeling future boreal forest soil C stocks and biomass growth and could help in planning forest management strategies in eastern Canada.

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“…The study consisted of a greenhouse experiment that was conducted at the Montreal Botanical Garden. Soil samples that were used in the experiment were collected from the Duchesnay Forest (46 (Moore & Houle, 2009, 2023. The original treatment consisted of chronic additions of 10-fold the annual rate of atmospheric N-deposition (8.5 kg ha −1 y −1 ) so that the soils approach N-saturation.…”

Section: Study Sitementioning

confidence: 99%

Nutritional response of sugar maple seedlings to water stress under highly nitrogen‐enriched soil conditions

Masson,

Mekontchou,

Cogliastro

et al. 2023

J. Plant Nutr. Soil Sci.

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BackgroundTemperate forests of eastern North America will be increasingly affected by chronic atmospheric nitrogen deposition, elevated temperatures, and drought events that will expose trees to moisture‐stressed conditions in non‐nitrogen‐limited soils. Yet, little is known regarding the response of sugar maple‐dominated forests to moisture stress under non‐nitrogen‐limiting conditions.AimsThe objective of this greenhouse study was to analyze the effects of moisture stress on the nutrition and growth of sugar maple seedlings growing on base‐poor forest soils that were strongly fertilized with nitrogen.MethodsOne‐year‐old sugar maple seedlings were grown with and without water stress on soils from a sugar maple stand that had been fertilized for 15 years at a rate of 85 kg N ha−1 y−1.ResultsDecreased moisture availability decreased total, leaf, root and stem biomass, and root/stem ratio. Leaf concentrations of N, P, Ca, and Mg and root concentrations of K, Ca, and Mg were 6% to 23% significantly lower under stressed versus unstressed conditions despite no changes in N, P, K, and Mg concentrations in the soil. Only soil Ca concentration was negatively affected by the moisture stress treatment. Soil and leaf δ15N and the k‐factor (i.e., isotopic discrimination effect of 15N‐labeled sources of N between roots and soil) that was used to assess N‐use efficiency of sugar maple seedlings did not differ between water stress treatments.ConclusionsOur results indicate that decreasing root biomass of sugar maple seedlings under moisture stress in non‐nitrogen‐limiting situations would decrease their ability to take up nutrients that are necessary for growth and induce lower concentrations in leaves and roots. Expected severe drought events could substantially limit nutrient uptake capacity of sugar maple seedlings on sites that are subject to chronic atmospheric N‐deposition, which would contribute to dieback in sugar maple stands.

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Chemistry of soil and foliage in declining sugar maple stands over 13 years of nitrogen addition

Cited by 4 publications

References 47 publications

Long-Term Simulated Nitrogen Deposition Has Moderate Impacts on Soil Microbial Communities across Three Bioclimatic Domains of the Eastern Canadian Forest

Long-Term Simulated Nitrogen Deposition Has Moderate Impacts on Soil Microbial Communities across Three Bioclimatic Domains of the Eastern Canadian Forest

Eastern Canadian boreal forest soil and foliar chemistry show evidence of resilience to long‐term nitrogen addition

Nutritional response of sugar maple seedlings to water stress under highly nitrogen‐enriched soil conditions

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