Effects of nitrate enrichment on leaf litter decomposition

Tonin, Alan M.; Hepp, Luiz Ubiratan

doi:10.4322/actalb.2011.022

Cited by 7 publications

(2 citation statements)

References 38 publications

(35 reference statements)

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“…We placed the reactors in an orbital shaker at 18±1°C at a constant rotation of 80 rpm. We defined the temperature and agitation conditions from the physical and chemical characteristics of the streams in the study region (Tonin and Hepp, 2011). However, the reactors with the plant material and the water used for the leaching were closed to avoid contact with the atmospheric air.…”

Section: Leaching Experimentsmentioning

confidence: 99%

Leaching of carbon from native and non-native leaf litter of subtropical riparian forests

et al. 2018

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We evaluated the leaching of dissolved organic and inorganic carbon (DOC and DIC, respectively) from leaf litter of plant species of the native Atlantic Forest and of Pinus elliottii (Engelm.) and Eucalyptus grandis (Hill ex Maiden) forests. We carried out experiments in which leaves from each forest system (native, E. grandis, and P. elliottii) were placed in reactors with sterile water. After 1/4 h, 1 h, 4 h, 12 h, 24 h, and 48 h of incubation, we quantified the concentrations of DIC and DOC of each leachate. The greatest quantity of DIC was leached in the native forest system, whereas the greatest quantity of DOC was leached in the E. grandis forest system. With respect to the period of year, the greatest quantity of DIC was leached in autumn, whereas that of DOC was leached in the summer. Our results demonstrated that the replacement of native species in riparian zones, by non-native forest monocultures, could alter the chemical composition of the water. Finally, the results presented in this paper reinforce the need for a more careful look at ecological processes.

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Section: Leaching Experimentsmentioning

confidence: 99%

Leaching of carbon from native and non-native leaf litter of subtropical riparian forests

et al. 2018

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“…Fungal biomass decreased with decreases in oxygen concentration along a pollution gradient in northwestern Portugal [7]. Similarly, a laboratory experiment showed that in eutrophic environments the microbial degradation of leaf litter was slower under low oxygen conditions [22].…”

Section: Introductionmentioning

confidence: 91%

Combined Effects of Dissolved Nutrients and Oxygen on Plant Litter Decomposition and Associated Fungal Communities

et al. 2017

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Aquatic ecosystems worldwide have been substantially altered by human activities, which often induce changes in multiple factors that can interact to produce complex effects. Here, we evaluated the combined effects of dissolved nutrients (nitrogen [N] and phosphorus [P]; three levels: concentration found in oligotrophic streams in the Cerrado biome, 10× and 100× enriched) and oxygen (O; three levels: hypoxic [4% O], depleted [55% O], and saturated [96% O]) on plant litter decomposition and associated fungal decomposers in laboratory microcosms simulating stream conditions under distinct scenarios of water quality deterioration. Senescent leaves of Maprounea guianensis were incubated for 10 days in an oligotrophic Cerrado stream to allow microbial colonization and subsequently incubated in microcosms for 21 days. Leaves lost 1.1-3.0% of their initial mass after 21 days, and this was not affected either by nutrients or oxygen levels. When considering simultaneous changes in nutrients and oxygen concentrations, simulating increased human pressure, fungal biomass accumulation, and sporulation rates were generally inhibited. Aquatic hyphomycete community structure was also affected by changes in nutrients and oxygen availability, with stronger effects found in hypoxic treatments than in depleted or saturated oxygen treatments. This study showed that the effects of simultaneous changes in the availability of dissolved nutrients and oxygen in aquatic environments can influence the activity and composition of fungal communities, although these effects were not translated into changes in litter decomposition rates.

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