Soil organic matter and salinity as critical factors affecting the bacterial community and function of Phragmites australis dominated riparian and coastal wetlands

Chi, Zifang; Wang, Wenjing; Li, Huai; Wu, Haitao; Yan, Baixing

doi:10.1016/j.scitotenv.2020.143156

Cited by 54 publications

(22 citation statements)

References 47 publications

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“…This result was consistent with those reported by Parlanti et al (2000) [ 25 ], but contrary to a previous study that found decreased FDOM intensity with increasing salinity gradients. Salinity played important roles in shaping the microbial community at phylum and genus levels, as different species of bacteria favored discriminatory xenobiotic metabolism and signal transduction of high or low salinities, thus impacting the generation or degradation of DOM [ 26 ]. Once the salinity arrived at the highest value of around 8, the activation of organic materials attenuated, as illustrated in Figure 3 , in the region around the lake.…”

Section: Discussionmentioning

confidence: 99%

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The Optical Characterization and Distribution of Dissolved Organic Matter in Water Regimes of Qilian Mountains Watershed

Xiao

Chen

Zhang

et al. 2021

IJERPH

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The constituents and content of dissolved organic matter (DOM) in the Qilian Mountain watershed were characterized with a spectroscopic technique, especially 3-DEEM fluorescence assisted by parallel factor (PARAFAC) analysis. The level of DOM in the surrounding area of Qinghai lake (thereafter the lake in this article specifically refers to Qinghai Lake)was highest at 9.45 mg C·L−1 and about 3 times less (3.09 mg C·L−1) in a cropland aquatic regime (the lowest value). In general, DOM was freshly autochthonously generated by plankton and plant debris, microorganisms and diagenetic effects in the aquatic environment (FI > 1.8). Component 1 (humic acid-like) and 3 (fulvic acid-like) determined the humification degree of chromophoric dissolved organic matter (CDOM). The spatial variation of sulfate and nitrate in the surrounding water regime of the lake revealed that organic molecules were mainly influenced by bacterial mediation. Mineral disintegration was an important and necessary process for fluorescent fraction formation in the cropland water regime. Exceptionally, organic moiety in the unused land area was affected by anespecially aridclimate in addition to microbial metabolic experience. Salinity became the critical factor determining the distribution of DOM, and the total normalized fluorescent intensity and CDOM level were lower in low-salinity circumstances (0.2–0.5 g·L−1) with 32.06 QSU and 1.38 m−1 in the grassland area, and higher salinity (0.6~0.8 g·L−1) resulted in abnormally high fluorescence of 150.62 QSU and absorption of 7.83 m−1 in the cropland water regime. Climatic conditions and microbial reactivity controlled by salinity were found to induce the above results. Our findings demonstrated that autochthonous inputs regulated DOM dynamics in the Qilian Mountains watershed of high altitude.

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Section: Discussionmentioning

confidence: 99%

“…This proposed mechanism was supported by the increasing concentrations of Cl − and DOC in Swan Coastal Plain wetlands [ 43 ]. Corresponding to the abovementioned contents, salinity was another regulator constraining microbial reactivity and FDOM distribution [ 26 ].…”

Section: Discussionmentioning

confidence: 99%

The Optical Characterization and Distribution of Dissolved Organic Matter in Water Regimes of Qilian Mountains Watershed

Xiao

Chen

Zhang

et al. 2021

IJERPH

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“…In Plot C, SOM ranged mainly from 6 to 10 g/kg (low) throughout the entire region. Throughout the plots, SSC and SOM showed a clear negative spatial correlation [ 55 ].…”

Section: Results and Analysismentioning

confidence: 99%

Estimation of Soil Salt Content and Organic Matter on Arable Land in the Yellow River Delta by Combining UAV Hyperspectral and Landsat-8 Multispectral Imagery

Sun

Jiang

et al. 2022

Sensors

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Rapid and large-scale estimation of soil salt content (SSC) and organic matter (SOM) using multi-source remote sensing is of great significance for the real-time monitoring of arable land quality. In this study, we simultaneously predicted SSC and SOM on arable land in the Yellow River Delta (YRD), based on ground measurement data, unmanned aerial vehicle (UAV) hyperspectral imagery, and Landsat-8 multispectral imagery. The reflectance averaging method was used to resample UAV hyperspectra to simulate the Landsat-8 OLI data (referred to as fitted multispectra). Correlation analyses and the multiple regression method were used to construct SSC and SOM hyperspectral/fitted multispectral estimation models. Then, the best SSC and SOM fitted multispectral estimation models based on UAV images were applied to a reflectance-corrected Landsat-8 image, and SSC and SOM distributions were obtained for the YRD. The estimation results revealed that moderately salinized arable land accounted for the largest proportion of area in the YRD (48.44%), with the SOM of most arable land (60.31%) at medium or lower levels. A significant negative spatial correlation was detected between SSC and SOM in most regions. This study integrates the advantages of UAV hyperspectral and satellite multispectral data, thereby realizing rapid and accurate estimation of SSC and SOM for a large-scale area, which is of great significance for the targeted improvement of arable land in the YRD.

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“…Soil microbial populations and community composition are affected by a range of edaphic factors, such as soil physicochemical properties ( Wakelin et al, 2007 ) and soil management practices ( Chen et al, 2014 ). Nutrient substrates ( Ling et al, 2017 ), soil pH ( Bainard et al, 2016 ), moisture ( Battin et al, 2003 ; Nguyen et al, 2018 ; Yang et al, 2019 ; Chi et al, 2021 ), and plant community cover ( Bainard et al, 2016 ) are the main ecological drivers of soil bacterial abundance, diversity, and community composition. Soil carbon (C) and nitrogen (N) contents strongly affect soil bacteria, because they decompose soil organic C and N to obtain energy ( Yang et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of a Furrow-Bed Seeding System on Stand Establishment, Soil Bacterial Diversity, and the Yield and Quality of Alfalfa Under Saline Condition

et al. 2022

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Soil organic matter and salinity as critical factors affecting the bacterial community and function of Phragmites australis dominated riparian and coastal wetlands

Cited by 54 publications

References 47 publications

The Optical Characterization and Distribution of Dissolved Organic Matter in Water Regimes of Qilian Mountains Watershed

The Optical Characterization and Distribution of Dissolved Organic Matter in Water Regimes of Qilian Mountains Watershed

Estimation of Soil Salt Content and Organic Matter on Arable Land in the Yellow River Delta by Combining UAV Hyperspectral and Landsat-8 Multispectral Imagery

Effects of a Furrow-Bed Seeding System on Stand Establishment, Soil Bacterial Diversity, and the Yield and Quality of Alfalfa Under Saline Condition

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