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Szabó, Sándor; Braun, Mihály; Nagy, Péter Tamás; Balázsy, Sándor; Reisinger, O.

doi:10.1023/a:1004084027363

Cited by 17 publications

(4 citation statements)

References 24 publications

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“…Therefore, it can be seen that the mobility of open-chain Gd complexes into and out of the plants is faster than that of macrocyclic ones. In the present study, the release of Gd from L. gibba into the Gd free solution took place much faster (half-life time <3 days) than that of macroelements (K, Ca, Mg, S, N; half-life time 40-80 day) measured during decomposition in an earlier study (Szabó et al, 2000). These results suggest that Gd mobilisation into and out of the macrophytes is merely influenced by physical processes (diffusion, differences in concentration) and not any chemical process.…”

Section: Leaching Of Gadolinium From Macrophytessupporting

confidence: 39%

Can aquatic macrophytes be biofilters for gadolinium based contrasting agents?

et al. 2018

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The use of gadolinium-based contrasting agents (GBCA) is increasing because of the intensive usage of these agents in magnetic resonance imaging (MRI). Waste-water treatment does not reduce anthropogenic Gd-concentration significantly. Anomalous Gd-concentration in surface waters have been reported worldwide. However, removal of GBCA-s by aquatic macrophytes has still hardly been investigated. Four aquatic plant species (Lemna gibba, Ceratophyllum demersum, Elodea nuttallii, E. canadensis) were investigated as potential biological filters for removal of commonly used but structurally different GBCA-s (Omniscan, Dotarem) from water. These plant species are known to accumulate heavy metals and are used for removing pollutants in constructed wetlands. The Gd uptake and release of the plants was examined under laboratory conditions. Concentration-dependent infiltration of Gd into the body of the macrophytes was measured, however significant bioaccumulation was not observed. The tissue concentration of Gd reached its maximum value between day one and four in L. gibba and C. demersum, respectively, and its volume was significantly higher in C. demersum than in L. gibba. In C. demersum, the open-chain ligand Omniscan causes two-times higher tissue Gd concentration than the macrocyclic ligand Dotarem. Gadolinium was released from Gd-treated duckweeds into the water as they were grown further in Gd-free nutrient solution. Tissue Gd concentration dropped by 50% in duckweed treated by Omniscan and by Dotarem within 1.9 and 2.9 days respectively. None of the macrophytes had a significant impact on the Gd concentration of water in low and medium concentration levels (1-256 μg L). Biofiltration of GBCA-s by common macrophytes could not be detected in our experiments. Therefore it seems that in constructed wetlands, aquatic plants are not able to reduce the concentration of GBCA-s in the water. Furthermore there is a low risk that these plants cause the accumulation of anthropogenic Gd in the food chain.

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Section: Leaching Of Gadolinium From Macrophytessupporting

confidence: 39%

Can aquatic macrophytes be biofilters for gadolinium based contrasting agents?

et al. 2018

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“…They senesced rapidly, sank to the soil surface, and decomposed with the help of microbes in the soil. Through the decomposition, a large amount of nutrients, such as N, P, and K, are released from the dying duckweed into the water [ 23 ]. At the rice-flowering stage, almost no green duckweed was observed on the water’s surface, which was also supported by no temperature difference in the soil between the control and duckweed treatment ( Figures S1 and S2 , respectively).…”

Section: Discussionmentioning

confidence: 99%

“…At the rice-flowering stage, almost no green duckweed was observed on the water’s surface, which was also supported by no temperature difference in the soil between the control and duckweed treatment ( Figures S1 and S2 , respectively). The bio-availability of the nutrients released from the decomposing duckweed litter varied for different elements, with macronutrients being more mobile than micronutrients in the paddy water [ 23 ].…”

Section: Discussionmentioning

confidence: 99%

“…In addition, duckweed coverage decreases the water temperature and pH, which slows ammonia volatilization, especially at the early growth stage of rice [ 19 , 21 , 22 ]. At the middle and late growth stages, rice-leaf shading accelerates duckweed decomposition, releasing N and other minerals into the rice paddy [ 23 ]. Therefore, duckweed coverage could increase the nitrogen-use efficiency by decreasing N loss through volatilization or runoffs, showing significant ecological and economic benefits [ 19 , 20 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

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A Preliminary Study of the Impacts of Duckweed Coverage during Rice Growth on Grain Yield and Quality

Luo,

Hu,

et al. 2023

Plants

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The overuse and misuse of fertilizers have been causing duckweed outbreaks in irrigation ditches and paddy fields in many rice-growing areas. However, how duckweed coverage in a paddy field affects the rice yield and grain quality is under debate because duckweed may act as either a weed, competing with rice for mineral nutrients, or a “nutrient buffer”, providing significant ecological and economic benefits. To understand the effects of duckweed coverage throughout rice growth on the yield and quality of rice grains, an experiment with three Japonica rice cultivars was conducted with fertile lotus-pond bottom soil as a growth medium to provide sufficient mineral nutrients for both the duckweed and rice. Averaged across three rice cultivars, duckweed coverage decreased the panicle density but increased the spikelet density and grain weight, resulting in no significant change in the rice yield. Duckweed coverage had no impact on the processing and appearance quality in general, but significant duckweed-by-cultivar interactions were detected in the head rice percentage and grain chalkiness, indicating different sensitivities of different cultivars in response to the duckweed treatment. The decrease in breakdown and increase in setback values in the rapid visco analyzer (RVA) profile of rice flour suggested that duckweed coverage during rice growth worsened the cooking quality of the rice. However, no significant change in the palatability of the cooked rice was found. The most profound change induced by the duckweed was the nutritional quality; duckweed coverage increased the protein concentration but decreased the concentrations of Mg, Mn, Cu, and Zn in rice grains. This preliminary study suggested that duckweed coverage during rice growth has profound effects on the rice nutrient uptake and grain nutritional quality under the circumstances, and further research on the responses of the rice quality to the duckweed coverage in paddy fields in multiple locations and years is needed.

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Biomass and nutrient stock of submersed and floating macrophytes in shallow lakes formed by rewetting of degraded fens

et al. 2011

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Ecosystem restoration by rewetting of degraded fens led to the new formation of large-scale shallow lakes in the catchment of the River Peene in NE Germany. We analyzed the biomass and the nutrient stock of the submersed (Ceratophyllum demersum) and the floating macrophytes (Lemna minor and Spirodela polyrhiza) in order to assess their influence on temporal nutrient storage in water bodies compared to other freshwater systems. Ceratophyllum demersum displayed a significantly higher biomass production (0.86-1.19 t DM = dry matter ha -1 ) than the Lemnaceae (0.64-0.71 t DM ha -1 ). The nutrient stock of submersed macrophytes ranged between 28-44 kg N ha -1 and 8-12 kg P ha -1 and that of floating macrophytes between 14-19 kg N ha -1 and 4-5 kg P ha -1 which is in the range of waste water treatment plants. We found the N and P stock in the biomass of aquatic macrophytes being 20-900 times and up to eight times higher compared to the nutrient amount of the open water body in the shallow lakes of rewetted fens (average depth: 0.5 m). Thereafter, submersed and floating macrophytes accumulate substantial amounts of dissolved nutrients released from highly decomposed surface peat layers, moderating the nutrient load of the shallow lakes during the growing season from April to October. In addition, the risk of nutrient loss to adjacent surface waters becomes reduced during this period. The removal of submersed macrophytes in rewetted fens to accelerate the restoration of the low nutrient status is discussed.

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Cited by 17 publications

References 24 publications

Can aquatic macrophytes be biofilters for gadolinium based contrasting agents?

Can aquatic macrophytes be biofilters for gadolinium based contrasting agents?

A Preliminary Study of the Impacts of Duckweed Coverage during Rice Growth on Grain Yield and Quality

Biomass and nutrient stock of submersed and floating macrophytes in shallow lakes formed by rewetting of degraded fens

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