Carbon cycling potential from Utricularia breviscapa decomposition in a tropical oxbow lake (São Paulo, Brazil)

Santino, Marcela Bianchessi da Cunha; Bianchini, Irineu

doi:10.1016/j.ecolmodel.2008.07.023

Cited by 17 publications

(11 citation statements)

References 36 publications

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“…Detritus is structurally heterogeneous (in terms of chemical composition) and detrital biomass can be considered to have two main constituents: labile or refractory, according to their potential degradability (Cunha-Santino and Bianchini Junior, 2008;Bianchini Junior and Cunha-Santino, 2011). During the decomposition process, the remaining POM of both species encompassed…”

Section: Resultsmentioning

confidence: 99%

“…Macrophyte detritus composition ranges from dissolved organic matter (DOM), which serves as microbial substrates; to particulate organic matter (POM) with large molecules such as cellulose, hemicelluloses and lignin (Cunha-Santino and Bianchini Junior, 2008). During decomposition, the chemical composition of the detritus changes, increasing the nitrogen concentration but decreasing the C:N ratio and thereby improving its nutritional value and consequently influencing decay rates (Poi de Neiff et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Organic matter cycling in a neotropical reservoir: effects of temperature and experimental conditions

2013

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AIM:This study reports a comparison between decomposition kinetics of detritus derived from two macrophyte species (Polygonum lapathifolium L.: Polygonaceae; Eichhornia azurea (Sw.) Kunth.: Pontederiaceae) growing in a neotropical reservoir (Brazil), under laboratory and field conditions, in order to assess hypotheses on the main differences in factors affecting organic matter cycling, including the effect of temperature. METHODS: Plant and water samples were collected from the reservoir in August 2009. In field incubation mass loss was assessed using a litter bag technique and in the laboratory the decay was followed using a decomposition chamber maintained under controlled conditions (i.e. in the dark, at 15 ºC and 25 ºC). A kinetic model was adopted to explain and compare the organic matter decay, ANOVA (Repeated Measures) testing was used to describe the differences between the treatments and a linear correlation was used to compare in situ and in vitro experiments. RESULTS: The mass decay was faster in natural conditions with rapid release of the labile-soluble portion. The simulated values of mineralization rates of dissolved organic matter and refractory organic matter were rapid in high temperatures (25 ºC). The high Q10 results (mainly for E. azurea), and experimental conditions, and outcomes of ANOVA testing indicate the temperature variation (10 ºC) influence the rates of mass decay. CONCLUSIONS: The results suggested rapid organic matter cycling in warm months (from October to December) supporting the microbial loop. Although the particulate organic matter losses are high in field conditions the results are of the same magnitude in both conditions suggesting an equivalence of the mass decay kinetic.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Organic matter cycling in a neotropical reservoir: effects of temperature and experimental conditions

2013

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“…From fitting the results with Equation 1, one obtains: 0.0080 day -1 for Cabomba furcata (Cunha and Bianchini Jr., 1998); 0.0058 day -1 for Egeria najas (Bitar, 2003); 0.0222 day -1 for Nymphoides indica (Helbing et al, 1986); 0.0035 day -1 for Oxycaryum cubense (Cunha and Bianchini Jr., 1998); 0.0065-0.0240 day -1 for Pistia stratiotes (Lopes-Ferreira et al, 2004); 0.0537 day -1 for Potamogetum perfoliatus (Hill and Webster, 1982); 0.0104 day -1 for Pontederia stenostachys (Lopes-Ferreira and Esteves, 1992); 0.0020-0.0277 day -1 for Salvinia auriculata (Howard-Williams and Junk, 1976;Cunha-Santino and Bianchini Jr., 2000); 0.0020-0.0044 day -1 for Typha domingensis (Gonçalves Jr. et al, 2004;Cunha-Santino and Bianchini Jr., 2006) and 0.0021-0.0054 day -1 for Utricularia breviscapa (Cunha-Santino and Bianchini Jr., 2008). Owing to the chemical composition and predominance of RPOC over LSPOC, the relative slow decomposition of E. azurea fibers points out that this species contributes effectively to the sediment organic matter of HPP Piraju Reservoir.…”

Section: Discussionmentioning

confidence: 99%

The fate of Eichhornia azurea (Sw.) Kunth. detritus within a tropical reservoir

Santino¹,

Bianchini²,

Okawa³

2010

Acta

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Aim: This study is aimed at comparing the kinetics of decomposition of Eichhornia azurea and discussing the fate of its detritus; Methods: The samples of aquatic macrophytes and water were collected in the Piraju Reservoir (São Paulo State, Brazil). The plant material was oven-dried and triturated and for each experimental condition (aerobic and anaerobic), 72 mineralization chambers were prepared with plant fragments and reservoir water. On sampling days the particulate and dissolved organic matter were quantified (on carbon basis POC and DOC, respectively); Results: The decomposition of E. azurea is more efficient under aerobic conditions, being 2.2 times faster than for the anaerobic process, according to the amount of mineralized carbon. For the decay of leaves, stems and roots of E. azurea the aerobic processes were 1.22-fold faster. It is assumed that the fractions responsible for the high oxygen consumption have reduced periods of half-time, and therefore do not accumulate in the ecosystems. Owing to the biomass of E. azurea in the Piraju Reservoir, the aerobic decay of E. azurea can promote moderate depletion in the dissolved oxygen budget. With the rate of the mineralization of refractory materials (≡ half-time varying from 385 to 462 days), the fibrous debris of this plant, i.e. refractory fractions, associated with the appropriate conditions of pH and oxi-reduction potential, can contribute to the gas production and storage of particulate organic matter in sediments.Keywords: decomposition, aquatic macrophytes, kinetic model, mineralization, Piraju Reservoir.Resumo: Objetivo: Nesse estudo foram comparadas as cinéticas de decomposição de Eichhornia azurea e discutidos os destinos de seus detritos; Métodos: As amostras de plantas e de água foram coletadas no reservatório de Piraju (Estado de São Paulo, Brasil). As plantas foram secas e trituradas; para cada condição experimental (meio aeróbio e anaeróbio) foram preparadas 72 câmaras de mineralização com fragmentos de planta e água do reservatório. Nos dias de coleta as frações particuladas e dissolvidas de matéria orgânica foram quantificadas (em base de carbono: carbono orgânico particulado (COP) e dissolvido (COD), respectivamente); Resultados: Com base no carbono mineralizado, os resultados indicaram que a decomposição de E. azurea foi mais eficiente em meio aeróbio (2,2 vezes mais rápido) que em anaerobiose. Para a decomposição das folhas, talos e raízes os processos aeróbios foram 1,22 vezes mais rápidos. Verificou-se que as frações responsáveis pelos consumos elevados de oxigênio possuem tempos de meia vida reduzidos e, desse modo, não se acumulam no reservatório. Devido à biomassa de E. azurea no reservatório de Piraju os processos aeróbios de decomposição dessa espécie podem promover depleções moderadas no balanço de oxigênio dissolvido. Devido à magnitude dos coeficientes de degradação (meia-vida: de 385 a 462 dias), associados com as condições predominantes de pH e potencial de oxi-redução, as frações refratárias dos detritos (fibras...

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“…In addition to the quality of resources (i.e., chemical composition), the biotic (i.e., type of decomposer and ability of organisms to utilize detritus) and abiotic (i.e., fragmentation, abrasion, photodegradation, temperature, oxygen availability, pH, trophic state) factors affect the detritus mass loss. In this context, the environmental factors tend to make a ''fine adjustment'' of decomposition coefficients (in this case, mainly k 3 ), as well their temporal changes (Cunha-Santino & Bianchini, 2008).…”

Section: Discussionmentioning

confidence: 99%

The decomposition of aquatic macrophytes: bioassays versus in situ experiments

2011

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In aquatic sciences, the agreement between laboratory and field observations remains a challenge. Using kinetic modeling, this research aims to compare the decomposition in laboratory and in situ conditions. In the in situ incubations, the mass decreases of the aquatic macrophytes (Echinodorus tenellus, Hydrocotyle verticillata, Najas microcarpa and Pontederia parviflora) were described using a litter bag technique and in the laboratory their decomposition was maintained under controlled conditions. The plants and water samples were collected from a tropical reservoir (Brazil). To describe the particulate organic carbon (POC) decay we adopted a two stage kinetic model that considered the heterogeneity of resources. The released organic carbon (i.e., losses related to mineralization, dissolution and sedimentation of smaller particles than the litter bag mesh) were used to compare the results derived from the field and laboratory incubations. Despite the methodological differences, the results show equivalence among the POC decay. The decomposition measured by litter bags method was 1.32 faster, owing to the effects of losses by sedimentation of the smaller particles, abrasion, action of decomposer organisms (e.g., fragmentation and enzymatic attack) and synergy among these factors. From a mathematical modeling approach, the results validate the use of decomposition data obtained under controlled conditions providing estimations of energy and matter fluxes within aquatic ecosystems. However, it is necessary to adopt a coefficient to acquire the similarity (e.g., 1.32).

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Carbon cycling potential from Utricularia breviscapa decomposition in a tropical oxbow lake (São Paulo, Brazil)

Cited by 17 publications

References 36 publications

Organic matter cycling in a neotropical reservoir: effects of temperature and experimental conditions

Organic matter cycling in a neotropical reservoir: effects of temperature and experimental conditions

The fate of Eichhornia azurea (Sw.) Kunth. detritus within a tropical reservoir

The decomposition of aquatic macrophytes: bioassays versus in situ experiments

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