Phosphorus and micronutrient dynamics during gymnosperm and angiosperm litters decomposition in temperate cold forest from Eastern Canada

Pourhassan, Nina; Bruno, Sébastien; Jewell, Mark Davidson; Shipley, Bill; Roy, Suzanne; Bellenger, Jean‐Philippe

doi:10.1016/j.geoderma.2016.03.018

Cited by 43 publications

(26 citation statements)

References 59 publications

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“…The observed Cu and Zn immobilization may respond to accumulation from the environment (soil and atmospheric deposition) as found by several authors for elements such as Fe, Cu, Mn, or Zn (He et al 2016;Laskowski et al 1995;Pourhassan et al 2016).…”

Section: Nutrient Release In Decomposing Needle Litter Throughout Timesupporting

confidence: 64%

Local basal area affects needle litterfall, nutrient concentration, and nutrient release during decomposition in Pinus halepensis Mill. plantations in Spain

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et al. 2018

Annals of Forest Science

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& Key message Stand density has a positive effect on C, K and Mg concentration in needle litterfall and a negative one on C, N, Ca, K, Mg, P, S, Zn, and Cu release from needle litter. Consequently, forest management practices such as thinning decrease nutrient concentration in needle litterfall and accelerate nutrient release from decomposing needles in Pinus halepensis plantations in Spain. & Context Silvicultural practices usually include stand density reduction resulting in changes in litterfall and litter decomposition rates. Little is known about the effect on nutrient concentrations in litterfall and nutrient release during decomposition even when this is the main path of nutrient return to soils. & Aims The aims of the study are to evaluate the seasonal pattern of nutrient concentration in litterfall, to study how nutrients are released from needle litterfall during decomposition, and to assess whether local basal area of the stand affects nutrient concentration of litterfall and nutrient release during litter decomposition. & Methods Eight plots were established on each of four stands covering the widest range in local basal area. A littertrap and 15 litterbags were placed on each plot. Periodically, needle litterfall and litter contained in the litterbags were analyzed for C,

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Section: Nutrient Release In Decomposing Needle Litter Throughout Timesupporting

confidence: 64%

Local basal area affects needle litterfall, nutrient concentration, and nutrient release during decomposition in Pinus halepensis Mill. plantations in Spain

Bueis

Bravo

Pando

et al. 2018

Annals of Forest Science

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“…We saw no significant effects on soil pH or any of the major elements measured over the first two years of establishment. Plants can alter the available or bioaccessible concentrations of soil elements either directly through uptake and crop removal or indirectly during decomposition of plant residues (e.g., Pourhassan et al ., ). Total concentrations of soil elements are generally not impacted by plants, unless the plants are hyperaccumulators (e.g., Ma et al ., ), and even then it can require several years to elicit a change in soil metal levels (Lasat, ).…”

Section: Discussionmentioning

confidence: 97%

Field‐grown transgenic switchgrass (Panicum virgatum L.) with altered lignin does not affect soil chemistry, microbiology, and carbon storage potential

et al. 2016

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Cell wall recalcitrance poses a major challenge on cellulosic biofuel production from feedstocks such as switchgrass (Panicum virgatum L.). As lignin is a known contributor of recalcitrance, transgenic switchgrass plants with altered lignin have been produced by downregulation of caffeic acid O-methyltransferase (COMT). Field trials of COMT-downregulated plants previously demonstrated improved ethanol conversion with no adverse agronomic effects. However, the rhizosphere impacts of altering lignin in plants are unknown. We hypothesized that changing plant lignin composition may affect residue degradation in soils, ultimately altering soil processes. The objective of this study was to evaluate effects of two independent lines of COMT-downregulated switchgrass plants on soils in terms of chemistry, microbiology, and carbon cycling when grown in the field. Over the first two years of establishment, we observed no significant differences between transgenic and control plants in terms of soil pH or the total concentrations of 19 elements. An analysis of soil bacterial communities via highthroughput 16S rRNA gene amplicon sequencing revealed no effects of transgenic plants on bacterial diversity, richness, or community composition. We also did not observe a change in the capacity for soil carbon storage: There was no significant effect on soil respiration or soil organic matter. After five years of establishment, d 13 C of plant roots, leaves, and soils was measured and an isotopic mixing model used to estimate that 11.2 to 14.5% of soil carbon originated from switchgrass. Switchgrass-contributed carbon was not significantly different between transgenic and control plants. Overall, our results indicate that over the short term (two and five years), lignin modification in switchgrass through manipulation of COMT expression does not have an adverse effect on soils in terms of total elemental composition, bacterial community structure and diversity, and capacity for carbon storage.

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“…Such variability could be due to other factors that we were unable to test using our dataset, particularly variations in Mo availability in soil and leaf litter, which is not routinely measured. Differences in Mo availability can be driven by the geochemistry of soil parent material (Wurzburger et al ., ), or degree of leaf litter decomposition (Pourhassan et al ., ), which has recently been suggested as a possible mechanism for the emergence of Mo limitation to N fixation throughout the growing season in colder climates (Jean et al ., ). Variation in Mo limitation of N fixation can also be due to less‐understood controls on N fixation such as microbial community composition.…”

Section: Discussionmentioning

confidence: 99%

Nutrient limitation of terrestrial free‐living nitrogen fixation

2017

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Nitrogen (N) fixation by free-living bacteria is a primary N input pathway in many ecosystems and sustains global plant productivity. Uncertainty exists over the importance of N, phosphorus (P) and molybdenum (Mo) availability in controlling free-living N fixation rates. Here, we investigate the geographic occurrence and variability of nutrient constraints to free-living N fixation in the terrestrial biosphere. We compiled data from studies measuring free-living N fixation in response to N, P and Mo fertilizers. We used meta-analysis to quantitatively determine the extent to which N, P and Mo stimulate or suppress N fixation, and if environmental variables influence the degree of nutrient limitation of N fixation. Across our compiled dataset, free-living N fixation is suppressed by N fertilization and stimulated by Mo fertilization. Additionally, free-living N fixation is stimulated by P additions in tropical forests. These findings suggest that nutrient limitation is an intrinsic property of the biochemical demands of N fixation, constraining free-living N fixation in the terrestrial biosphere. These findings have implications for understanding the causes and consequences of N limitation in coupled nutrient cycles, as well as modeling and forecasting nutrient controls over carbon-climate feedbacks.

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Phosphorus and micronutrient dynamics during gymnosperm and angiosperm litters decomposition in temperate cold forest from Eastern Canada

Cited by 43 publications

References 59 publications

Local basal area affects needle litterfall, nutrient concentration, and nutrient release during decomposition in Pinus halepensis Mill. plantations in Spain

Local basal area affects needle litterfall, nutrient concentration, and nutrient release during decomposition in Pinus halepensis Mill. plantations in Spain

Field‐grown transgenic switchgrass (Panicum virgatum L.) with altered lignin does not affect soil chemistry, microbiology, and carbon storage potential

Nutrient limitation of terrestrial free‐living nitrogen fixation

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