Influence of soil warming and N‐addition on sap flux density and stem radius variation in boreal stands in Quebec, Canada

Balducci, Lorena; Deslauriers, Annie; Barba, Daniele De; Rossi, Sergio; Houle, Daniel; Bergeron, Yves; Morin, Hubert

doi:10.1002/eco.2261

Cited by 2 publications

(1 citation statement)

References 87 publications

(110 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The annual average rate of N deposition in China increased to 21.1 kg•ha −1 in the 2000s, making the country the third largest in the world in terms of N deposition [10]. The deposition has changed the biogeochemical cycles of terrestrial ecosystems and has affected plant productivity [11], structure of microbial communities [12,13], and soil respiration [8]. More important, longterm N deposition has also greatly altered the composition and structure of DOM in soils [2], inevitably changed many important biogeochemical processes in forest soil, and changed the quality and quantity of DOC input and metabolism in the downstream of aquatic ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Dissolved Organic Matter as Affected by Forms and Doses of Nitrogen Applied to Soils of Temperate Deciduous Forests in China

Wang

Song

Wang

2023

Forests

View full text Add to dashboard Cite

Dissolved organic matter (DOM) is an important component in the biogeochemical cycles of elements like nitrogen (N) and carbon. The aim of this study was to elucidate the effect of long-term inorganic N addition on the quantity and quality of DOM in forest soils. A field study was conducted on three forms of inorganic N, namely (NH4)2SO4, NH4NO3, and NaNO3, applied at low (50 kg N ha−1) or high (150 kg N ha−1) annual doses from 2011 to 2019. The total dose was split into eight equal monthly doses applied during the growing season (from March to October). Both the form and the dose increased the content of dissolved organic carbon (DOC) in soil, the strongest effect being that of NaNO3. However, the higher dose had a weaker effect because of N enrichment. UV-visible (UV-vis) and excitation-emission matrix (EEM) spectroscopy showed that the addition of N made DOM more aromatic and increased the degree of humification. EEM-parallel factor analysis (PARAFAC) modelling suggested that DOM in the forest soils mainly contained a fulvic-like constituent (C1), humic-like substances (C2), and aromatic protein-like components (C3). The addition did not change the position of the DOM fluorophore in the soil but affected the proportions of the three PARAFAC-derived components (increasing those of C1 and C2 but decreasing that of C3), indicating that long-term addition of N may amplify the decrease in protein-like constituents of surface soil. Hence, N addition increased the complexity of the DOM structure.

show abstract

Section: Introductionmentioning

confidence: 99%

Dissolved Organic Matter as Affected by Forms and Doses of Nitrogen Applied to Soils of Temperate Deciduous Forests in China

Wang

Song

Wang

2023

Forests

View full text Add to dashboard Cite

show abstract

Monitoring weekly δ13C variations along the cambium–xylem continuum in the Canadian eastern boreal forest

Namvar,

Boucher,

Deslauriers

et al. 2024

Tree Physiology

View full text Add to dashboard Cite

Intra-annual variations of carbon stable isotope ratios (δ13C) in different tree compartments could represent valuable indicators of plant carbon source-sink dynamics, at weekly time scale. Despite this significance, the absence of a methodological framework for tracking δ13C values in tree rings persists due to the complexity of tree ring development. To fulfill this knowledge gap, we developed a method to monitor weekly variability of δ13C in the cambium-xylem continuum of black spruce species [Picea mariana (Mill.) BSP.] during the growing season. We collected and isolated the weekly incremental growth of the cambial region and the developing tree ring from five mature spruce trees over three consecutive growing seasons (2019–2021) in Simoncouche and two growing seasons (2020–2021) in Bernatchez, both located in the boreal forest of Quebec, Canada. Our method allowed for the creation of intra-annual δ13C series for both the growing cambium (δ13Ccam) and developing xylem cellulose (δ13Cxc) in these two sites. Strong positive correlations were observed between δ13Ccam and δ13Cxc series in almost all study years. These findings suggest that a constant supply of fresh assimilates to the cambium-xylem continuum may be the dominant process feeding secondary growth in the two study sites. On the other hand, rates of carbon isotopic fractionation appeared to be poorly affected by climate variability, at an inter- weekly time scale. Hence, increasing δ13Ccam and δ13Cxc trends highlighted here possibly indicate shifts in carbon allocation strategies, likely fostering frost resistance and reducing water uptake in the late growth season. Additionally, these trends may be related to the black spruce trees' responses to the seasonal decrease in photosynthetically active radiation. Our findings provide new insights into the seasonal carbon dynamics and growth constraints of black spruce in boreal forest ecosystems, offering a novel methodological approach for studying carbon allocation at fine temporal scales.

show abstract

Influence of soil warming and N‐addition on sap flux density and stem radius variation in boreal stands in Quebec, Canada

Cited by 2 publications

References 87 publications

Dissolved Organic Matter as Affected by Forms and Doses of Nitrogen Applied to Soils of Temperate Deciduous Forests in China

Dissolved Organic Matter as Affected by Forms and Doses of Nitrogen Applied to Soils of Temperate Deciduous Forests in China

Monitoring weekly δ13C variations along the cambium–xylem continuum in the Canadian eastern boreal forest

Contact Info

Product

Resources

About