Organochlorine Pesticides in Soils Around Watersheds of Beijing Reservoirs: A Case Study in Guanting and Miyun Reservoirs

Hu, Wenyou; Lü, Yonglong; Wang, Guang; Wang, Tieyu; Luo, Wei; Shi, Yunfeng; Zhang, Xiang; Jiao, Wentao

doi:10.1007/s00128-009-9679-7

Cited by 13 publications

(4 citation statements)

References 26 publications

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“…By comparing with previously reported results [16, 18, 19], it can be seen that DDTs have always been the main components of pesticidal POPs in the Guanting Reservoir area, that is, 93.2% in 2003, 90.2% in 2007, and 90.6% in 2009, respectively. Figure 2 shows that the concentration of pp′-DDE in soil is the greatest in 2009.…”

Section: Resultssupporting

confidence: 56%

HCHs and DDTs in Soils around Guanting Reservoir in Beijing, China: Spatial-Temporal Variation and Countermeasures

Wang

Teng

Lü

2012

The Scientific World Journal

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The concentrations of hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) in the topsoil samples around the Guanting Reservoir in Beijing were measured, and their spatial distribution and environmental risks were analyzed by GIS. The results showed that in 2003, 2007, and 2009, the HCHs concentrations were 0.66, 0.85, and 0.73 ng/g, and the DDTs concentrations were 9.50, 7.80, and 6.46 ng/g in the studied area, respectively. In the topsoil, the HCHs concentrations did not change much while the DDTs concentrations declined steadily. Most of the current residues in soil come from the POPs used in the past years but some new input is also detected in certain regions. The level of HCHs and DDTs residues in the south reservoir is lower than that in the north reservoir. The middle region has the highest HCHs and DDTs concentrations, especially near the Beixinpu town. The high risk regions of pollution of HCHs and DDTs are mainly distributed in the vicinity of Beixinpu town as well. Based on the aforementioned results, a comprehensive countermeasure is proposed entailing decision making, local implementation, scientific support, and public participation with regard to the long-term control and management of POPs around the Guanting Reservoir.

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Section: Resultssupporting

confidence: 56%

HCHs and DDTs in Soils around Guanting Reservoir in Beijing, China: Spatial-Temporal Variation and Countermeasures

Wang

Teng

Lü

2012

The Scientific World Journal

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“…Many endophytic bacteria have been isolated from various vegetations like medicinal plants (Passari et al, 2015 ), grasses (Kelemu et al, 2011 ), plant debris (Hu et al, 2009 ), and rice (Mano and Morisaki, 2008 ) were screened for the production of bioactive compounds (Strobel and Long, 1998 ). Perennial grasses are the most abundant renewable energy source in India.…”

Section: Discussionmentioning

confidence: 99%

A Novel Triculture System (CC3) for Simultaneous Enzyme Production and Hydrolysis of Common Grasses through Submerged Fermentation

et al. 2016

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The perennial grasses are considered as a rich source of lignocellulosic biomass, making it a second generation alternative energy source and can diminish the use of fossil fuels. In this work, four perennial grasses Saccharum arundinaceum, Panicum antidotale, Thysanolaena latifolia, and Neyraudia reynaudiana were selected to verify their potential as a substrate to produce hydrolytic enzymes and to evaluate them as second generation energy biomass. Here, cellulase and hemi-cellulase producing three endophytic bacteria (Burkholderia cepacia BPS-GB3, Alcaligenes faecalis BPS-GB5 and Enterobacter hormaechei BPS-GB8) recovered from N. reynaudiana and S. arundinaceum were selected to develop a triculture (CC3) consortium. During 12 days of submerged cultivation, a 55–70% loss in dry weight was observed and the maximum activity of β-glucosidase (5.36–12.34 IU) and Xylanase (4.33 to 10.91 IU) were observed on 2nd and 6th day respectively, whereas FPase (0.26 to 0.53 IU) and CMCase (2.31 to 4.65 IU) showed maximum activity on 4th day. Around 15–30% more enzyme activity was produced in CC3 as compared to monoculture (CC1) and coculture (CC2) treatments, suggested synergetic interaction among the selected three bacterial strains. Further, the biomass was assessed using Fourier-transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM). The FTIR analysis provides important insights into the reduction of cellulose and hemicellulose moieties in CC3 treated biomass and SEM studies shed light into the disruption of surface structure leading to access of cellulose or hemicelluloses microtubules. The hydrolytic potential of the CC3 system was further enhanced due to reduction in lignin as evidenced by 1–4% lignin reduction in biomass compositional analysis. Additionally, laccase gene was detected from A. faecalis and E. hormaechei which further shows the laccase production potential of the isolates. To our knowledge, first time we develop an effective endophytic endogenous bacterial triculture system having potential for the production of extracellular enzymes utilizing S. arundinaceum and N. reynaudiana as lignocellulosic feedstock.

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“…It was once Beijing's second largest water source for drinking, agricultural and industrial purposes. Since the 1970s, Guanting Reservoir has been heavily polluted owing to rapid industrialization and intensive application of chemical fertilizers and pesticides to arable fields in upstream regions (T. , Hu et al 2009 (Xue et al 2005(Xue et al , 2006. Along the shoreline of the reservoir, 4 species of healthy plants, Phragmites communis, Potamogeton crispus, Nymphaea tetragona and Najas marina, which are dominant aquatic plants in this region, were sampled from Daying (40°44' 30'' N, 115°90'71'' E), GuiS lake (40°45' 16'' N, 115°96' 08'' E) and KZ bridge (40°45' 00'' N, 115°88' 02'' E) where one of the rivers flows into the reservoir.…”

Section: Sample Collection and Isolation Of Endophytic Bacteriamentioning

confidence: 99%

Distribution of culturable endophytic bacteria in aquatic plants and their potential for bioremediation in polluted waters

Chen¹,

Tang²,

Mori³

et al. 2012

Aquat. Biol.

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Plant−bacterial asscociations can improve the degradation of organic pollutants in soil. However, little is known about the diversity and distribution of endophytic bacteria associated with aquatic plants and their potential to enhance phytoremediation of aquatic environments. In the present study, endophytic bacteria were isolated from 4 species of aquatic plants: Phragmites communis, Potamogeton crispus, Nymphaea tetragona and Najas marina. The isolated bacteria were classified into 12 genera in the Gammaproteobacteria, Bacilli, Alphaproteobacteria, Flavobacteria and Actinobacteria. In addition, different strains and/or different concentrations of the bacteria were isolated from different parts of the 4 plants, suggesting the different parts of the 4 plants harbored different endophytic bacteria. Some of the isolates degraded naphthalene and pesticides and some showed potential to dissolve insoluble phosphate. This is one of the first studies to isolate and compare culturable endophytic bacteria among different aquatic plants. This research indicates that culturable endophytes in aquatic plants are very diverse, but are dominated by Gammaproteobacteria, and have the potential to enhance in situ phytoremediation. KEY WORDS: Aquatic plants · Endophytic bacteria · Phytoremediation · Organic pollutants · Phosphorus Resale or republication not permitted without written consent of the publisherGuanting Reservoir shoreline where endophytic bacterial strains were isolated from aquatic plants.

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Organochlorine Pesticides in Soils Around Watersheds of Beijing Reservoirs: A Case Study in Guanting and Miyun Reservoirs

Cited by 13 publications

References 26 publications

HCHs and DDTs in Soils around Guanting Reservoir in Beijing, China: Spatial-Temporal Variation and Countermeasures

HCHs and DDTs in Soils around Guanting Reservoir in Beijing, China: Spatial-Temporal Variation and Countermeasures

A Novel Triculture System (CC3) for Simultaneous Enzyme Production and Hydrolysis of Common Grasses through Submerged Fermentation

Distribution of culturable endophytic bacteria in aquatic plants and their potential for bioremediation in polluted waters

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