Soil organic carbon within the vadose zone of a floodplain

Li, X.; Feng, Guang-Da; Sharratt, Brenton

doi:10.1007/s12665-018-7424-4

Cited by 6 publications

(2 citation statements)

References 69 publications

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“…2015; Li et al . 2018). The vadose zone could be regarded as an efficient natural filter, in which substances pass from the topsoil to the aquifer under a natural hydraulic gradient (McLin et al .…”

Section: Resultsmentioning

confidence: 99%

Vertical distribution of microbial communities and their response to metal(loid)s along the vadose zone–aquifer sediments

Zhong

Chen

et al. 2020

J Appl Microbiol

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Aims This study attempted to demonstrate the vertical shift in bacterial, archaeal and fungal communities along the vadose zone–aquifer sediments and their respective responses to environmental factors. Methods and Results We collected samples from the vadose zone and three aquifer sediments along a 42·5 m bore of a typical agricultural land. The results showed that the bacterial community shifted greatly with depth. The classes of Actinobacteria (19·5%) and NC10 (11·0%) were abundant in the vadose zone while Alphaproteobacteria (22·3%) and Gammaproteobacteria (20·1%) were enriched in the aquifer. Archaeal and fungal communities were relatively more homogeneous with no significant trend as a function of depth. Process analyses further indicated that selection dominated in the bacterial community, whereas stochastic processes governed archaeal and fungal communities. Moreover environment–bacteria interaction analysis showed that metal(loid)s, especially alkali metal, had a closer correlation with the bacterial community than physicochemical variables. Conclusions Depth strongly affected bacterial rather than archaeal and fungal communities. Metal(loid)s prevailed over physicochemical variables in shaping the bacterial community in the vadose zone–aquifer continuum. Significance and Impact of the Study Our study provides a new perspective on the structure of microbial communities from the vadose zone to the deep aquifers.

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Section: Resultsmentioning

confidence: 99%

Vertical distribution of microbial communities and their response to metal(loid)s along the vadose zone–aquifer sediments

Zhong

Chen

et al. 2020

J Appl Microbiol

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“…A strong relationship between crust strength and the salt content in clay-crusted playas has been identified in Arizona [21], but few results have been reported for other regions. In addition, previous studies have investigated soil potential wind erodibility [8,26], soil moisture [29], soil organic matter [30], and soil infiltration characteristics [31] in the Tarim River region, but information on the physical and chemical properties of salt-crusted soils is still lacking. Therefore, in this study, in addition to the PSD (particle size distribution), we also investigated the physical and chemical properties of the soil, including the salt content, composition, and salt crust thickness and strength.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Salinization and Wind Erosion on the Texture of Surface Soils: An Investigation of Paired Samples from Soils with and without Salt Crust

Guo

2022

Land

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Wind erosion removes fine soil particles and thus affects surface soil properties, but the existence of a salt crust could prevent wind erosion and protect fine soil particles. Such results referring to wind erosion affecting soil surface textural properties have been reported by many studies. However, it is still not clear whether soil properties differ between salt-crusted soils and adjacent soils without a salt crust in areas experiencing serious wind erosion. Therefore, the objective of this study was to investigate paired samples from salt-crusted and non-crusted surface soils at 23 sites in the Tarim River Basin. The particle size distribution, salt content and composition, and crust thickness and strength were determined. The results of the pooled t-test reveal that, compared with soils without a salt crust, the salt-crusted soils had finer particles (silt + clay), but this difference only occurred in paired soils from the same site, and the silt content showed the largest difference between the paired soils. The salt content and salt crust strength showed great variability, from 88.52 to 603 g·kg−1 and from 0.30 to 5.96 kg·cm−1, respectively, at all sites, but only a weak relationship (R2 = 0.396) between the salt content and crust strength was found, indicating that the salt content was not the only factor affecting crust strength. Our results suggest that wind erosion and salinization cause great soil texture spatial heterogeneity, especially for silt particles in the Tarim River Basin. Variation in salt crust strength can influence dust emissions and must be considered in future management.

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Sedimentology of a delta formed by agricultural river discharge into a flood‐control reservoir, Iowa

Streeter,

Schilling,

Stoeffler

et al. 2024

River Research & Apps

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River deltas are ecologically critical landscape components and are responsible as habitats for millions of people, wildlife, and plant communities. Deltas store vast quantities of eroded nutrient‐rich sediment and play a significant role in water quality management through nutrient cycling and storage. Many studies have been conducted in marine and tidal delta environments that characterize the sedimentology and geomorphic characteristics of these relatively young landscapes. However, little work has been completed in even younger inland reservoir deltas. This study characterized the sediments and geomorphology of the growing delta forming at the outlet of the Des Moines River into Red Rock Reservoir in south‐central Iowa and discussed the implications of the lower delta sediment and topographic characteristics in terms of sediment and nutrient storage, and the potential impact of the delta on other hydroecological factors. We found that the ca. 30‐year‐old lower delta is storing up to 60% of the contributing watershed's eroded sediment and total carbon, with total sediment depths of ca. 9 m across the 755‐ha area. Further, we identified two major geomorphic landscape positions within the lower delta that were categorized as distributary channels and delta plains. Sedimentological differences in these microscale landscape positions were identified. Sand content was greater at lowest distributary channel elevations and at the highest plain elevations whereas silt dominated the elevation range between these two extremes. The zone of silt accumulation corresponds to the range in elevation associated with normal lake level management. The silt‐dominated area is regularly inundated and covered with a variety of emergent vegetation and is the zone of critical importance for waterbird habitat and nutrient‐processing capacity.

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Soil organic carbon within the vadose zone of a floodplain

Cited by 6 publications

References 69 publications

Vertical distribution of microbial communities and their response to metal(loid)s along the vadose zone–aquifer sediments

Vertical distribution of microbial communities and their response to metal(loid)s along the vadose zone–aquifer sediments

The Impact of Salinization and Wind Erosion on the Texture of Surface Soils: An Investigation of Paired Samples from Soils with and without Salt Crust

Sedimentology of a delta formed by agricultural river discharge into a flood‐control reservoir, Iowa

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