Land use driven change in soil organic carbon affects soil microbial community assembly in the riparian of Three Gorges Reservoir Region

Li, Yutong; Xie, Xiaona; Zhu, Zhengjie; Liu, Kun; Liu, Wuxing; Wang, Jun

doi:10.1016/j.apsoil.2022.104467

Cited by 6 publications

(3 citation statements)

References 50 publications

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“…Soil pH was determined in 1:2.5 soil-water suspension determination of soil pH value [ 2 ]. Soil organic carbon (TOC) was determined by potassium dichromate oxidation and external heating method [ 27 ]. Soil total nitrogen (TN) was determined by an element analyzer.…”

Section: Methodsmentioning

confidence: 99%

Chromium Contamination and Health Risk Assessment of Soil and Agricultural Products in a Rural Area in Southern China

Yu²,

Wang

et al. 2022

Toxics

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With the rapid development of industry, chromium (Cr) pollutants accumulate constantly in the soil, causing severe soil Cr pollution problems. Farmland Cr pollution hurts the safety of agricultural production and indirectly affects human health and safety. However, the current situation of Cr pollution in farmland soil and crops has not been detailed enough. In this study, the evaluation of Cr potential risk in soil-crop systems was conducted in a rural area that was affected by industry and historic sewage irrigation. Ten different crops and rhizosphere soils were sampled from four fields. The results showed that Cr contents in farmland soil exceeded the national standard threshold in China (>21.85%), and the Cr content in edible parts of some agricultural products exceeded that too. According to the PCA and relation analysis, the Cr accumulation in edible parts showed a significant correlation with soil Cr contents and available potassium contents. Except for water spinach, the target hazard quotient (THQ) of the other crops was lower than 1.0 but the carcinogenic health risks all exceeded the limits. The carcinogenic risks (CR) of different types of crops are food crops > legume crops > leafy vegetable crops and root-tuber crops. A comprehensive assessment revealed that planting water spinach in this area had the highest potential risk of Cr pollution. This study provided a scientific and reliable approach by integrating soil environmental quality and agricultural product security, which helps evaluate the potential risk of Cr in arable land more efficiently and lays technical guidelines for local agricultural production safety.

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Section: Methodsmentioning

confidence: 99%

Chromium Contamination and Health Risk Assessment of Soil and Agricultural Products in a Rural Area in Southern China

Yu²,

Wang

et al. 2022

Toxics

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“…Interestingly, the opposite has been observed in aquatic environments (Hou et al, 2020). The riparian zone, which straddles the aquatic and terrestrial zones, has a unique natural environment and is home to a wide variety of species (Y. Li et al, 2022). Despite this, changes in hydrological fluxes and natural water flows, along with ecosystem development, have resulted in changes to both the structure and ecosystem functions of the riparian zone (Hira et al, 2023; Muhammad et al, 2022; Yuancai et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Rare methanotrophs adapt to broader environmental gradients than abundant methanotrophs in the riparian zone of the Three Gorges Reservoir

Jiajia,

Arif,

Changxiao

2023

Land Degrad Dev

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Soil communities are intricately linked to ecosystem functioning. Uncovering the responses of rare and abundant taxa to environmental change is vital for understanding methanotrophic community assembly and ecosystem function. It is unclear what the proportions of the different taxa are in riparian soil and how environmental change may impact these, and thereby affect the structure and assembly of different communities. Considering both abundant and rare taxa, we investigated environmental thresholds and phylogenetic signals related to the ecological preferences of methanotrophic communities under complex environmental gradients, and explore the factors that influence their assembly. It has ecological significance for predicting how communities will gather in response to changing environmental conditions. It was found that methanotrophs had different ecological network patterns across land‐use types, with the network complexity of abundant taxa being higher in grasslands and woodlands than that of rare taxa. Different ecological preference thresholds and phylogenetic signals were observed between abundant and rare subcommunities in the riparian zone, with rare taxa possessing potentially broader environmental adaptation capabilities. Rare taxa were phylogenetically clustered closer together than abundant taxa. The assembly of abundant taxa was dominated by stochastic processes, whereas the assembly of rare taxa was dominated by deterministic processes. Soil pH played an important role in regulating the balance between the assembly processes of abundant and rare subcommunities. The deterministic assembly of rare taxa and the stochastic assembly of abundant taxa increased with pH values. We revealed the complexity of a co‐occurring ecological network, identified the mediators of methanotrophic community assembly, and examined the adaptability of rare and abundant methanotrophic species to different environmental gradients. These findings indicate that it is possible to predict the generation and maintenance of methanotrophic community diversity by studying how methanotrophs will respond to environmental changes in the riparian zone during vegetation restoration projects.

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“…Hence, an understanding of the changing characteristics and drivers of soil microbial community composition under different land uses is vital to regulating SOC stabilization and improving soil fertility. Many studies have shown that land-use can change the composition and diversity of soil microbial communities [ 14 , 15 , 16 ]. Other studies, however, indicated that land-use had no effect on soil microbial community composition [ 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Land-Use Driven Changes in Soil Microbial Community Composition and Soil Fertility in the Dry-Hot Valley Region of Southwestern China

Liu

Chen

et al. 2022

Microorganisms

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The Dry-Hot Valley is a unique geographical region in southwestern China, where steep-slope cultivation and accelerating changes in land-use have resulted in land degradation and have aggravated soil erosion, with profound impacts on soil fertility. Soil microbes play a key role in soil fertility, but the impact of land-use changes on soil microbes in the Dry-Hot Valley is not well known. Here, we compared characteristics and drivers of soil microbial community composition and soil fertility in typical Dry-Hot Valley land uses of sugarcane land (SL), forest land (FL), barren land (BL) converted from former maize land (ML), and ML control. Our results showed that BL and SL had reduced soil organic carbon (SOC), total nitrogen (TN), and total potassium (TK) compared to ML and FL. This indicated that conversion of ML to SL and abandonment of ML had the potential to decrease soil fertility. We also found that fungal phyla Zoopagomycota and Blastocladiomycota were absent in SL and BL, respectively, indicating that land-use change from ML to SL decreased the diversity of the bacterial community. Redundancy analysis indicated that the relative abundance of bacterial phyla was positively correlated with TN, SOC, and available potassium (AK) content, and that fungal phyla were positively correlated with AK. Land-use indirectly affected the relative abundance of bacterial phyla through effects on soil moisture, clay, and AK contents, and that of fungal phyla through effects on clay and AK contents. In addition, land-use effects on bacteria were greater than those on fungi, indicating that bacterial communities were more sensitive to land-use changes. Management regimes that incorporate soil carbon conservation, potassium addition, and judicious irrigation are expected to benefit the stability of the plant–soil system in the Dry-Hot Valley.

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Land use driven change in soil organic carbon affects soil microbial community assembly in the riparian of Three Gorges Reservoir Region

Cited by 6 publications

References 50 publications

Chromium Contamination and Health Risk Assessment of Soil and Agricultural Products in a Rural Area in Southern China

Chromium Contamination and Health Risk Assessment of Soil and Agricultural Products in a Rural Area in Southern China

Rare methanotrophs adapt to broader environmental gradients than abundant methanotrophs in the riparian zone of the Three Gorges Reservoir

Land-Use Driven Changes in Soil Microbial Community Composition and Soil Fertility in the Dry-Hot Valley Region of Southwestern China

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