不同肥料处理下茶园土壤细菌和古菌群落的时间变化研究

Wang, Hua; Yang, Shao-Hui; Yang, Jin-Ling; Lv, Yamin; Zhao, Xing; Pang, Ji-Liang

doi:10.1631/jzus.b1400114

Cited by 14 publications

(13 citation statements)

References 55 publications

(106 reference statements)

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“…Boreal lake sediments likewise host a rather stable denitrifier community throughout most sampling times during a year (Saarenheimo et al, 2015 ). However, such findings are in contrast to other studies of agricultural soils, drained peatlands and intertidal wetland ecosystems where season significantly impacted denitrifier community composition (Bremer et al, 2007 ; Marhan et al, 2011 ; Andert et al, 2012 ; Hu et al, 2014 ; Wang et al, 2014 ). During such studies a developing plant community, seasonally changes of environmental parameters such as pH, and sampling times that covered the whole year including winter contributed to the observed seasonal changes in denitrifier community.…”

Section: Discussioncontrasting

confidence: 83%

Drying-Rewetting and Flooding Impact Denitrifier Activity Rather than Community Structure in a Moderately Acidic Fen

et al. 2016

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Wetlands represent sources or sinks of the greenhouse gas nitrous oxide (N2O). The acidic fen Schlöppnerbrunnen emits denitrification derived N2O and is also capable of N2O consumption. Global warming is predicted to cause more extreme weather events in future years, including prolonged drought periods as well as heavy rainfall events, which may result in flooding. Thus, the effects of prolonged drought and flooding events on the abundance, community composition, and activity of fen denitrifiers were investigated in manipulation experiments. The water table in the fen was experimentally lowered for 8 weeks in 2008 and raised for 5.5 months in 2009 on three treatment plots, while three plots were left untreated and served as controls. In situ N2O fluxes were rather unaffected by the drought treatment and were marginally increased by the flooding treatment. Samples were taken before and after treatment in both years. The structural gene markers narG and nosZ were used to assess possible changes in the nitrate reducer and denitrifier community in response to water table manipulations. Detected copy numbers of narG and nosZ were essentially unaffected by the experimental drought and flooding. Terminal restriction fragment length polymorphism (TRFLP) patterns of narG and nosZ were similar before and after experimental drought or experimental flooding, indicating a stable nitrate reducer and denitrifier community in the fen. However, certain TRFs of narG and nosZ transcripts responded to experimental drought or flooding. Nitrate-dependent Michaelis-Menten kinetics were assessed in anoxic microcosms with peat samples taken before and 6 months after the onset of experimental flooding. Maximal reaction velocities vmax were higher after than before flooding in samples from treament but not in those from control plots taken at the same time. The ratio of N2O to N2O + N2 was lower in soil from treatment plots after flooding than in soil from control plots, suggesting mitigation of N2O emissions by increased N2O-reduction rates after flooding. N2O was consumed to subatmospheric levels in all microcosms after flooding. The collective data indicate that water table manipulations had only minor effects on in situ N2O fluxes, denitrifier abundance, and denitrifier community composition of the acidic fen, while active subpopulations of denitrifiers changed in response to water table manipulations, suggesting functionally redundant subpopulations occupying distinct ecological niches in the fen.

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Section: Discussioncontrasting

confidence: 83%

Drying-Rewetting and Flooding Impact Denitrifier Activity Rather than Community Structure in a Moderately Acidic Fen

et al. 2016

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“…It should be noted that the nanoencapsulation systems altered the release profiles of the herbicides, with slower release during the first 7 days, so that the herbicidal activity outside the nanoparticles was lower, compared to the high initial level of activity provided by the free herbicides.Changes over time in the bacterial community responsible for the soil nitrogen cycle can be caused by physical factors such as heat, water availability, and pH 29 30 31 32 33 34 . Wang et al (2014) used the qPCR technique and specific genes associated with the soil nitrogen cycle to identify alterations in the soil microbiota and ecological processes in different types of fertilized soils 33 .…”

Section: Resultsmentioning

confidence: 99%

Nanoparticles Based on Chitosan as Carriers for the Combined Herbicides Imazapic and Imazapyr

Maruyama

Guilger

Páscoli

et al. 2016

Sci Rep

171

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The use of lower concentrations and fewer applications of herbicides is one of the prime objectives of the sustainable agriculture as it decreases the toxicity to non-targeted organisms and the risk of wider environmental contamination. In the present work, nanoparticles were developed for encapsulation of the herbicides imazapic and imazapyr. Alginate/chitosan and chitosan/tripolyphosphate nanoparticles were manufactured, and their physicochemical stability was evaluated. Determinations were made of the encapsulation efficiency and release kinetics, and the toxicity of the nanoparticles was evaluated using cytotoxicity and genotoxicity assays. The effects of herbicides and herbicide-loaded nanoparticles on soil microorganisms were studied in detail using real-time polymerase chain reactions. The nanoparticles showed an average size of 400 nm and remained stable during 30 days of storage at ambient temperature. Satisfactory encapsulation efficiencies of between 50 and 70% were achieved for both types of particles. Cytotoxicity assays showed that the encapsulated herbicides were less toxic, compared to the free compounds, and genotoxicity was decreased. Analyses of soil microbiota revealed changes in the bacteria of the soils exposed to the different treatments. Our study proves that encapsulation of the herbicides improved their mode of action and reduced their toxicity, indicating their suitability for use in future practical applications.

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“…Soil pH has been significantly correlated with the soil mesophilic bacteria and actinomycetes. (Lauber et al, 2008, Wang et al, 2014 confirming that bacterial communities were strongly correlated, with soil pH. However, many studies have demonstrated that fungal biomass was not Rebati Nadia,Bouchenafa Nadia,Oulbachir Karima,Svideniuk Mykhailo Journ.Geol.Geograph.Geoecology,27(3), 485-494 ________________________________________________________________________________________________________________________________________________________________ strongly related to soil pH (Frey et al, 1999, Lauber et al, 2008, which is also what we found (Table 4).…”

Section: Effect Of Altitudinal Gradient and Soil Physicochemical Propmentioning

confidence: 91%

Remote sensing and ground based assessment of distribution of land cover parameters inthe catchment area of Wadi el K’sob M’sila (Algeria)

Rebati¹,

Bouchenafa²,

Oulbachir³

et al. 2019

Journ. Geol., Geogr., and Geoec..

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Remote sensing methodology was applied to assess two land cover parameters (elevation and soil moisture) in the first stage.Shuttle Radar Topography Mission (SRTM) digital elevation model (DEM) was used to build a map of the water catchment basins within the Wadi El K'sob area. Relative soil moisture for the territory of the Wadi El K'sob catchment area was estimated by using the Sentinel-1/Multispectral Instrument (MSI) and Landsat-8/Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS) optical multispectral data. Elevation data of the sampling points range from 398 to 1081 meters above sea level. Soil moisturevaried from 0.2 to 0.37 relative units. The effects of altitude and physico-chemical properties of soil on soil microflora communities in the catchment area of Wadi El K'sob M’sila (Algeria) were investigated in the second stage. The work presented here identified three groups of microorganisms in the soil samples collected in spring 2017from 7 locations situated in the catchment area of Wadi El K'sob M’sila (Algeria) along with 11 physico-chemical characteristics. Statistical tests showed that actinomycetes, fungi and mesophilic bacteria were positively correlated to the altitude. The results revealed that the microflora communities was very dependent on soil physico-chemical characteristics, the main parameters were relative soil moisture, texture, pH, electrical conductivity, organic carbon, organic matter, total nitrogen and available potassium. Generally, the parameters analyzed in this study, indicate a change in the soil microflora community according to the altitudinal and soil physico-chemical variations.

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不同肥料处理下茶园土壤细菌和古菌群落的时间变化研究

Cited by 14 publications

References 55 publications

Drying-Rewetting and Flooding Impact Denitrifier Activity Rather than Community Structure in a Moderately Acidic Fen

Drying-Rewetting and Flooding Impact Denitrifier Activity Rather than Community Structure in a Moderately Acidic Fen

Nanoparticles Based on Chitosan as Carriers for the Combined Herbicides Imazapic and Imazapyr

Remote sensing and ground based assessment of distribution of land cover parameters inthe catchment area of Wadi el K’sob M’sila (Algeria)

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