Soil aggregate stability response to hydraulic conditions in water level fluctuation zone of the Three Gorges Reservoir, China

Nsabimana, Gratien; Bao, Yuhai; He, Xingyuan; Nambajimana, Jean de Dieu; Yang, Le; Li, Jinlin; Uwiringiyimana, Ernest; Nsengumuremyi, Pascal; Ntacyabukura, Tite

doi:10.1016/j.catena.2021.105387

Cited by 21 publications

(7 citation statements)

References 48 publications

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“…Current research in the riparian zone of the TGR has focused on the effects of hydrological status on the nutrient dynamics of riparian vegetation in the reservoir area ( Chen et al, 2021 , 2022 ), the effects of dry and wet cycles or water level fluctuations on soil aggregates and the response of soil microbial communities to external disturbances (e.g., elevated nitrogen levels, different land use types, hydrological stress, etc. ; Nsabimana et al, 2020 ; Ding et al, 2021 ; He et al, 2021 ; Li et al, 2021 ; Nsabimana et al, 2021 ).…”

Section: Discussionmentioning

confidence: 99%

Microbial community and soil enzyme activities driving microbial metabolic efficiency patterns in riparian soils of the Three Gorges Reservoir

Yang

Chen

et al. 2023

Front. Microbiol.

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Riparian zones represent important transitional areas between aquatic and terrestrial ecosystems. Microbial metabolic efficiency and soil enzyme activities are important indicators of carbon cycling in the riparian zones. However, how soil properties and microbial communities regulate the microbial metabolic efficiency in these critical zones remains unclear. Thus, microbial taxa, enzyme activities, and metabolic efficiency were conducted in the riparian zones of the Three Gorges Reservoir (TGR). Microbial carbon use efficiency and microbial biomass carbon had a significant increasing trend along the TGR (from upstream to downstream); indicating higher carbon stock in the downstream, microbial metabolic quotient (qCO2) showed the opposite trend. Microbial community and co-occurrence network analysis revealed that although bacterial and fungal communities showed significant differences in composition, this phenomenon was not found in the number of major modules. Soil enzyme activities were significant predictors of microbial metabolic efficiency along the different riparian zones of the TGR and were significantly influenced by microbial α-diversity. The bacterial taxa Desulfobacterota, Nitrospirota and the fungal taxa Calcarisporiellomycota, Rozellomycota showed a significant positive correlation with qCO2. The shifts in key microbial taxa unclassified_k_Fungi in the fungi module #3 are highlighted as essential factors regulating the microbial metabolic efficiency. Structural equation modeling results also revealed that soil enzyme activities had a highly significant negative effect on microbial metabolism efficiency (bacteria, path coefficient = −0.63; fungi, path coefficient = −0.67).This work has an important impact on the prediction of carbon cycling in aquatic-terrestrial ecotones.

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Section: Discussionmentioning

confidence: 99%

Microbial community and soil enzyme activities driving microbial metabolic efficiency patterns in riparian soils of the Three Gorges Reservoir

Yang

Chen

et al. 2023

Front. Microbiol.

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“…As for the soil aggregate stability, Ran et al [26,27] demonstrated that this aggregate stability was the highest and the lowest under the intermediate and strong hydrological stresses, respectively, whilst Cui et al [17] observed that the aggregate stability was highest and lowest under the none and intermediate hydrological stresses. Moreover, Nsabimana et al [28] concluded that the stability of the aggregates less than 2 mm decreased as the elevation increased, using laser diffraction method, while he pointed out that the aggregate stability increased as the elevation increased, using wetting and wet-shaking methods [29]. The above mentioned studies have presented discrepancies in the effects of the hydrological regime on soil aggregates in the riparian zone.…”

Section: Introductionmentioning

confidence: 99%

The Impacts of the Hydrological Regime on the Soil Aggregate Size Distribution and Stability in the Riparian Zone of the Three Gorges Reservoir, China

Zhang

Chen

Bao

et al. 2023

Water

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The impoundment of the Three Gorges Reservoir (TGR) has greatly altered the hydrological regime and thus formed a distinctive riparian zone with anti-seasonal inundation and exposure, which may affect the soil aggregate properties in this riparian zone. Yet, the soil aggregate size distribution and stability influenced by the hydrological regime along the step-impounded elevation have rarely been documented. This study aimed to elucidate how the hydrological regime of the TGR affected the aggregate size distribution and stability in the riparian zone. Based on the step-impounded elevation, topsoil samples were collected from four elevation-dependent transects in a middle section of the TGR. Dry-sieving and wet-sieving methods were employed. The results showed that, with a decrease in the elevation gradient, the mass percentage of the >5 mm aggregates significantly decreased, while the proportions of the other size classes presented an increasing trend. Additionally, the mean weight diameter (MWD), geometric mean diameter (GMD), aggregate stability rate (ASR), and percentage of aggregate destruction (PAD) of the fractal dimension showed a successive decrease with a decrease in the elevation gradient, whereas PADMWD, PADGMD, PADASR, and the fractal dimension demonstrated a reverse trend. It can thus be deduced that the hydrological regime of the TGR significantly modified the aggregate size distribution and dramatically reduced the aggregate stability, which may provide a crucial basis for assessing the soil erosion in similar riparian zones.

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“…While the soil was submerged, the SOC concentration decreased substantially as it was released into overlying water and consumed by microorganisms and plants. As the inundation time increased, plants decayed and organic matter from the plants was released into the soil, causing an increase in SOC, and microbial activity during this process also caused an increase in DOC concentration (Fierer & Schimel 2002;Nsabimana et al 2021;Xiao et al 2022). The plants and microbial activity increased, which consumed the amounts of SOC and DOC, so the concentration of SOC and DOC was decreased during the drying period.…”

Section: The Effects Of Wet-dry Cycle On Soil Organic Carbonmentioning

confidence: 99%

Different tolerance of three typical riparian plants (Cynodon dactylon, Alternanthera philoxeroides, and Acorus calamus) to different depths of waterlogging caused variations in soil nutrient release and microbial diversity

Wang¹,

Wang³

et al. 2022

Water Quality Research Journal

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Water-level changes in the water-level fluctuating zone (WLFZ) promoted soil and plants to release nutrients into the water, threatening the water health in the reservoir. Plant restoration in the WLFZ is also an important way to reduce the nutrient release in order to select plants that can effectively reduce the release of soil nutrients under changing water levels. This study conducted a flooding experiment to reveal the difference in the change in soil physico-chemical properties and microbial communities planted with various plants under different water-level conditions. The flooding experiment began at the end of September 2020 and was planted with three dominant plants common to reservoirs, namely Cynodon dactylon, Alternanthera philoxeroides, and Acorus calamus. Our study found the three common dominant plants along the reservoir, and C. dactylon had a good adsorption capacity for nitrogen and phosphorus when it was flooded with shallow water, decreasing soil nutrients during the drying period. After a wetting–drying cycle, there was an obvious and significant (p < 0.05) divergence among soil microbial community structures between N0 and D1, D2, and D3, respectively. This study could provide sufficient reference information for plant selection and the assessment of nutrient release of WLFZ in restoration work.

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Soil aggregate stability response to hydraulic conditions in water level fluctuation zone of the Three Gorges Reservoir, China

Cited by 21 publications

References 48 publications

Microbial community and soil enzyme activities driving microbial metabolic efficiency patterns in riparian soils of the Three Gorges Reservoir

Microbial community and soil enzyme activities driving microbial metabolic efficiency patterns in riparian soils of the Three Gorges Reservoir

The Impacts of the Hydrological Regime on the Soil Aggregate Size Distribution and Stability in the Riparian Zone of the Three Gorges Reservoir, China

Different tolerance of three typical riparian plants (Cynodon dactylon, Alternanthera philoxeroides, and Acorus calamus) to different depths of waterlogging caused variations in soil nutrient release and microbial diversity

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