Effects of root organic exudates on rhizosphere microbes and nutrient removal in the constructed wetlands

Chen, Zong-Jing; Tian, Yunhui; Zhang, Yang; Song, Benru; Li, Hua-Chao; Chen, Zhang‐He

doi:10.1016/j.ecoleng.2016.04.001

Cited by 103 publications

(44 citation statements)

References 32 publications

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“…This difference in soil structure could be the result of evolution of the vegetation cover and rizosphere at studied plots especially at the EXT and REX where herbaceous vegetation dominated (Hanajík et al 2016). Root systems and exudates of the vegetation at these plots affected very likely the soil nutrition properties (Chen et al 2016) and thus were reflected in higher pH (H 2 O) values comparing to REN and NEX plots with lower abundance of herbaceous species. However, to our knowledge no research was so far focused on soil structure differences among windthrow plots in the High Tatras proving or disproving significant effect of soil structure or vegetation cover on the soil reaction.…”

Section: Resultsmentioning

confidence: 99%

Dehydrogenase activity in topsoil at windthrow plots in Tatra National Park

Hanajík

Gáfriková

Zvarík

2017

Central European Forestry Journal

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The aim of the study was to compare the effect of windthrow treatments established after the windstorm in 2004 on the activity of enzyme dehydrogenase (DHA) in forest topsoils. We also focused on the effect of the recent windthrow (May 2014) on the DHA in topsoil. Soil samples were collected in July 2014 from four sites in the Tatra National Park: EXT -tree trunks and wood debris extracted after the windstorm in 2004, NEX -area left for self-regeneration after the windstorm in 2004, REX -tree trunks and wood debris extracted after the windstorm (May 2014), REN -Norway spruce stand set as a control plot. We measured pH, dry weight %, soil organic matter (SOM), carbon content in microbial biomass (C bio ) and DHA. Dehydrogenase activity at studied plots was the lowest at the EXT plot and the highest values were measured at the REN plot. DHA at NEX was similar to REN suggesting comparable ecological conditions at these plots comparing to EXT. Carbon content in microbial biomass at plots reflected intensity of dehydrogenase activity in sequence EXT < REX < NEX < REN.

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Section: Resultsmentioning

confidence: 99%

Dehydrogenase activity in topsoil at windthrow plots in Tatra National Park

Hanajík

Gáfriková

Zvarík

2017

Central European Forestry Journal

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“…In addition, the plant roots provide favorable conditions for the development of microorganisms capable of transforming the chemical forms of nitrogen (Liu et al, 2012). According to Chen et al (2016), plants release exudates from the roots that affect the density and diversity of the root microbiota, which in turn increase the rates of nutrient removal.…”

Section: Resultsmentioning

confidence: 99%

Efficiency of horizontal subsurface flow-constructed wetlands considering different support materials and the cultivation positions of plant species

Miranda¹,

Matos²,

Matos³

et al. 2020

Rev. ambiente água

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The present work evaluated the influence of filling substrate material (crushed PET bottles or fine gravel) on the efficiency of pollutant removal in horizontal subsurface flow constructed wetlands (HSSF-CWs). They were cultivated with a consortium of elephant grass cv. Napier (Pennisetum purpureum Schum) and Tifton 85 (Cynodon spp.) to treat wastewater from a common milk cooling tank (WWMT). For this, six HSSF-CWs were used which had dimensions of 0.6 m tall x 1.0 m wide x 2.5 m long. In order to investigate possible efficiency loss in the removal of pollutants from the system, operation was divided into two periods: Period I (from April to December 2015) and Period II (April to December 2016). Thus, the removal efficiencies of BOD5, solids and total nitrogen (TN), total phosphorus (TP), potassium (K) and sodium (Na) from WWMT were statistically compared. Results indicated that the efficiency of the HSSF-CWs for removing pollutants increased or remained similar after one year and nine months of their operation; and PET bottles were a viable alternative substrate in HSSF-CWs based on the efficient removal of pollutants from WWMT during the one year and nine months of monitoring. Crushed PET bottles constitute a viable substrate for filling HSSF-CWs. Altering the cultivation positions of the plant species did not change pollutant removal efficiencies, but indicates the importance of species arrangement to maximize system performance.

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“…Pb concentrations in the roots were higher than those in the shoots in all nZVI amended and unamended treatments, indicating that K. scoparia roots were the preferential Pb storage organ. Reduction in concentrations of Pb in roots of K. scoparia under the effect of high doses of nZVI could be related to the large specific surface area of nZVI and their high adsorption capacity, which might reduce availability of Pb for being uptaken by the plant roots [40]. Besides that, inhibitory effects of high doses of nZVI due to their toxicity could reduce Pb absorption by K.…”

Section: Phytoextraction Of Pb From Soilmentioning

confidence: 99%

Effect of zero-valent iron nanoparticles on the phytoextraction ability of Kochia scoparia and its response in Pb contaminated soil

Zand

Tabrizi

2020

Environmental Engineering Research

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Nanotechnology-supported phytoremediation is a new approach in remediation of toxic metal polluted soils, but very little is known about the effects of nanoparticles on plant survival and performance in Pb-contaminated soil. Seedlings of K. scoparia were exposed to different regimes of nanoparticles of zero-valent iron (nZVI) to investigate nZVI effects on plant growth, Pb uptake and accumulation and physiological response. Results indicated that the total Pb contents in K. scoparia treated with low to moderate concentrations of nZVI (100-500 mg/kg) were higher than those in control, with the highest Pb accumulation capacity of 857.18 μg per pot obtained in soil treated with 500 mg/kg nZVI. Translocation of Pb from the roots to the shoots of K. scoparia slightly increased with nZVI content of soil from 100 to 500 mg/kg, while Pb transfer in K. scoparia was suppressed at higher nZVI doses. This might be related to the biomass reduction and decrease of chlorophyll content induced by high nZVI levels. Results provide a promising method to remediate Pb-polluted soil by applying proper amounts of nZVI to enhance phytoremediation performance. Selective interaction of plants and nZVI has great application prospects in the context of soil remediation.

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Effects of root organic exudates on rhizosphere microbes and nutrient removal in the constructed wetlands

Cited by 103 publications

References 32 publications

Dehydrogenase activity in topsoil at windthrow plots in Tatra National Park

Dehydrogenase activity in topsoil at windthrow plots in Tatra National Park

Efficiency of horizontal subsurface flow-constructed wetlands considering different support materials and the cultivation positions of plant species

Effect of zero-valent iron nanoparticles on the phytoextraction ability of Kochia scoparia and its response in Pb contaminated soil

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