Relative contribution of different decay processes to the decomposition of Eichhornia crassipes (Mart.) solms

Singhal, Pradeep K.; Gaur, S.; Talegaonkar, Leena

doi:10.1016/0304-3770(92)90027-g

Cited by 17 publications

(10 citation statements)

References 13 publications

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“…20% of detritus during in situ decomposition of E. azurea, which occurred within the first 24 hours of experiment (Stripari and Henry, 2002). In contrast to the literature, the leaching process lasted four to seven days (Singhal et al, 1992;Gupta et al, 1996) during decomposition of macrophytes. Dissolved compounds released during the first step of decomposition are predominantly nonstructural substances (organic and inorganic), with high potential for use by microbial metabolism (Wetzel, 1995).…”

Section: Discussioncontrasting

confidence: 44%

“…The primary net productivity of emergent aquatic macrophyte in freshwater systems and mangroves is often comparable to that from a rain forest; for instance, a value ranging from 19 to 37.5 Mg C ha -1 year -1 was reported for tropical freshwater emergent macrophytes (Wetzel, 2001), while for a tropical rain forest the primary net productivity varied from 1.7 to 21.7 Mg C ha -1 year -1 (Clark et al, 2001). Primary productivity of aquatic macrophyte is driven by abiotic and biotic processes such as temperature, solar radiation, nutrients, water velocity (Biudes and Camargo, 2008), ratio of herbivory (Lodge, 1991) and flooding pulse (Silva et al, 2009). Thus, these organisms are not only important to a high primary productivity or for their interactions with wildlife; they also play a major role in the cycling of various elements.…”

Section: Introductionmentioning

confidence: 99%

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Implication of anaerobic and aerobic decomposition of Eichhornia azurea (Sw.) Kunth. on the carbon cycling in a subtropical reservoir

2014

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This study aimed at describing kinetic aspects of aerobic and anaerobic mineralization of Eicchornia azurea. The samples of aquatic macrophyte and water were collected in the Monjolinho Reservoir (22° 00' S and 47° 54' W). To determine the leachate potential, dried plant fragments were added to reservoir water, with sampling lasting for 4 months, where the particulate and dissolved organic carbon concentrations were measured. The kinetics of mass loss was obtained with 10 mineralization chambers for both aerobic and anaerobic conditions, with the plant fragments and reservoir water. Two additional chambers were used to monitor the volume of gases produced from anaerobic mineralization, with bioassays to determine oxygen uptake. The results were fitted to a first-order kinetic model, from which 27.21% of detritus corresponded to labile/soluble fractions and 72.62% to the refractory fractions. The decay rates for the global mass losses of the labile/soluble components were 2.07 day -1. DOC mineralization was not verified for either condition. Under aerobic condition, the mass loss constant rate (0.0029 day -1 ) for the refractory fractions was 2.4 the value for the anaerobic one. Under anaerobic condition, the gases formation occurred in three phases. Based on these results, in the Monjolinho Reservoir, the decomposition of E. azurea that undergo within the water column and in upper layers of sediment is a faster process, favoring the mineralization. In contrast, in the lower layers of sediment the diagenetic processes (i.e. humus production and accumulation of organic matter) are favored.Keywords: decay, oxygen consumption, gases formation, aquatic macrophyte, Monjolinho Reservoir. Implicações da decomposição aeróbia e anaeróbia de Eichhornia azurea (Sw.)Kunth. na ciclagem de carbono em um reservatório subtropical ResumoNesse estudo descreveram-se aspectos cinéticos da decomposição aeróbia e anaeróbia de Eichhornia azurea. As amostras da macrófita aquática e de água foram coletadas no reservatório do Monjolinho (22° 00' S e 47° 54' O). Para a determinação do potencial de lixiviação, adicionaram-se fragmentos de planta (previamente secos) em água do reservatório. Nos experimentos de decomposição, as amostragens foram realizadas durante 4 meses e quantificaram-se as frações particuladas e dissolvidas de carbono. Para descrever as cinéticas de perda de massa, para cada condição (aeróbia e anaeróbia) foram preparadas 10 incubações contento fragmentos de plantas e água do reservatório. A cada dia de amostragem as frações particuladas e dissolvidas de carbono orgânico foram quantificadas. Foram também preparadas 2 câmaras para registrar a formação de gases da degradação anaeróbia e o consumo de oxigênio na degradação aeróbia. Os resultados foram ajustados a um modelo cinético de 1ª ordem. Verificou-se que 27,21% dos detritos corresponderam à fração lábil/solúvel e 72,62% à refratária. O coeficiente global de perda de massa das frações lábeis/solúveis foi 2,07 dia -1 . Nas duas condições não houve mineralização ...

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Section: Discussioncontrasting

confidence: 44%

Section: Introductionmentioning

confidence: 99%

Implication of anaerobic and aerobic decomposition of Eichhornia azurea (Sw.) Kunth. on the carbon cycling in a subtropical reservoir

2014

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“…Such a biphasic decay pattern was previously observed in senescent and completely dead water hyacinth leaves Singhal et al, 1992). Rates of microbial decay of young water hyacinth leaves, however, are 4 and 12 times higher than that of senescent and completely dead water hyacinth leaves .…”

Section: Discussionmentioning

confidence: 59%

Decomposition of young water hyacinth leaves in lake water

1996

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Rates of weight loss and release of nutrients during different phases of decomposition in young water hyacinth leaves were determined under laboratory conditions . The leaves decomposed solely by physical leaching during the initial 4-day phase and later by microbial processes . The largest part of weight loss and nutrient release by physical leaching took place within the first 4 h of incubation and thereafter the decomposition rate declined . Microbial processes decayed leaves at a significantly higher rate than that by physical leaching . The overall decay rate constants were related inversely and the release of nutrients directly to the levels of leaf additions in the lake water. The dissolved inorganic and organic nutrients were released chiefly by abiotic processes during the initial as well as later phases of decay . The release was significantly higher during the initial phase in comparison with that during the later phase. Microbes utilized only a small amount of nutrients that were released during decomposition of water hyacinth leaves . The % release of various elements from the decaying leaves was in the order of K > P > C>Na>N .

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“…The speed of release the excretion to the environment was determined by the metabolism speed of water hyacinth, and TOC of 1 and 1' increased by physical leaching during the initial phase [13][14] of the experiment when the background was blank. The speed of water hyacinth assimilation was determined by the organic matter concentration of the environment, as the TOC increased so did the speed of water hyacinth assimilation.…”

Section: B Equilibrium Concentration A) Organic Matter Absorption Anmentioning

confidence: 99%

Roles of Plant Metabolism for Organic Matter Removal Using Water Hyacinth to Treat Sewage

Gao

Ai³

2010

2010 4th International Conference on Bioinformatics and Biomedical Engineering

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Water hyacinth (Eichhornia crassipes) is a floating aquatic plant which has been employed for wastewater treatment in many part of the world. A lot of researches on the performance of aquatic plant treating sewage had been carried out and it was concluded that water hyacinth was one of the plants who had the best performance. But few reports about what role the metabolism of aquatic plants played for the organic matter removal when they are used to treat wastewater can be found. In this paper, the excretion and assimilation of water hyacinth cultivated in different mediums were investigated. It was concluded that water hyacinth excreted organic matter to their living environment and their metabolism process assimilated organic matter at the same time. When the speed of excretion and assimilation came to equivalence, the organic matter concentration tended to constant. Part of the water hyacinth excretion was easily to be degraded, and the coupling of water hyacinth assimilation and microorganism degradation would occur when microorganism existed. Using water hyacinth to treat raw sewage, the start rate of TOC removal was greatly improved because of the combination of water hyacinth assimilation and microorganism degradation.

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Relative contribution of different decay processes to the decomposition of Eichhornia crassipes (Mart.) solms

Cited by 17 publications

References 13 publications

Implication of anaerobic and aerobic decomposition of Eichhornia azurea (Sw.) Kunth. on the carbon cycling in a subtropical reservoir

Implication of anaerobic and aerobic decomposition of Eichhornia azurea (Sw.) Kunth. on the carbon cycling in a subtropical reservoir

Decomposition of young water hyacinth leaves in lake water

Roles of Plant Metabolism for Organic Matter Removal Using Water Hyacinth to Treat Sewage

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