Effect of land use on the composition of bacterial and fungal communities in saline–sodic soils

Feng, Haojie; Wang, Shunyi; Gao, Zhen; Wang, Zhaokun; Ren, Xueqin; Hu, Shuwen; Pan, Hong

doi:10.1002/ldr.3386

Cited by 27 publications

(12 citation statements)

References 53 publications

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“…The above model shows the distribution of saline-alkali concentration of soil solution with soil depth at any time. The measured values are in good agreement with the theoretical values, which can well reflect the law of soil saline-alkali concentration movement [20].…”

Section: Mathematical Model Of Salt and Alkali Transportsupporting

confidence: 81%

Saline-alkali migration in soda saline soil based on sub-soiling technology

Yuan¹,

Feng²,

Jang³

et al. 2019

DWT

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To study the saline-alkali migration law of soda saline-alkali soils based on sub-soiling technology, improve the soil quality of soda saline-alkali agricultural area, and provide scientific basis for the construction of high and stable yield fields of crops in soda saline-alkali soils. Based on the unsaturated soil water movement theory and the convection-dispersion theory of solute transport in porous media, a single-parameter and two-parameter model of saline-alkali transport was constructed to analyze the distribution of saline-alkali concentration in soil solution with the depth of soil layer. Soil samples were taken from four soda saline-alkali soils in different periods under sub-soiling tillage. The experimental data of soil saline-alkali content were obtained, and the law of saline-alkali migration was analyzed. When the depth was 60 cm, the content of saline-alkali in the soil before breaking the plough bottom was 0.4%, and the content of saline-alkali was 0.35% after breaking the plough bottom with sub-soiling technique. It can be seen that sub-soiling technique can promote saline-alkali infiltration and reduce the content of saline-alkali in the planting soil layer. The average water content of the sub-soiled soil was 23.4%, which was significantly higher than that of the subsoiled soil. The soil salinity and alkali content in 100 cm depth layer decreased by 30.8%, and that in 40 cm depth layer decreased by 57%. The salinity and alkali data in different regions showed that the soil salinity and alkali content in the soil decreased by 30.8%. Saline-alkali data from different regions show that due to sub-soiling, salt-alkali in the soil moves upward, salt-alkali in the lower part of crop roots moves outward, and salt-alkali in the soil moves away from the crop root zone; between 0 and 50 cm under the soil, the content of soil salt and alkali is from small to large, forming a desalination area of saline and alkali content; sub-soiling tillage makes 0-30 cm layer soil desalinization rate reach 83.5%, the soil salt removal rate of 0-60 cm layer reached 79.9%; The effect of sub-soiling on soil salinity is less than 1.634% of the initial value. Conclusion: sub-soiling technology can effectively reduce saline alkali content and increase crop yield in soda saline alkali soil.

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Section: Mathematical Model Of Salt and Alkali Transportsupporting

confidence: 81%

Saline-alkali migration in soda saline soil based on sub-soiling technology

Yuan¹,

Feng²,

Jang³

et al. 2019

DWT

View full text Add to dashboard Cite

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“…Protocols for determining soil properties, including bulk density (BD), pH, electrical conductivity (EC), exchangeable cations, and exchangeable sodium percentage (ESP) were described in Feng et al (2019). Poorly crystalline Fe and Al (Fe ox and Al ox , respectively) and, operationally defined organically complexed Fe and Al (Fe p and Al p , respectively) were measured according to the methods of Mehra & Jackson (2013).…”

Section: Methodsmentioning

confidence: 99%

“…The experimental site located in the rural district of the western Songnen Plain (45 28 0 3.56 00 N, 123 47 0 23.57 00 E) was initiated in 2003, and is detailed in Feng et al (2019). Briefly, the study area is characterized by a temperate, semiarid continental climate.…”

Section: Experimental Sitementioning

confidence: 99%

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Aggregate stability and organic carbon stock under different land uses integrally regulated by binding agents and chemical properties in saline‐sodic soils

et al. 2021

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Aggregate stability and soil organic carbon (SOC) are critical for maintaining soil structure and preserving soil productivity. Land use substantially affects the process of soil aggregate stabilization and SOC sequestration, yet the detailed mechanisms have not been well studied in degraded soil ecosystems (e.g., saline-sodic soils).Therefore, to interpret the effects of land-use changes on soil aggregate stability and SOC stocks in saline-sodic soils, soils were sampled from four major land-use areas (degraded meadow, artificial forest, sorghum field, and paddy field) in Northeast China. The results showed that artificial forest soils exhibited the greatest proportion of water-stable aggregate (>250 μm) in 0-10 and 10-20 cm layers than sorghum and paddy field, which was mainly due to the absence of tillage disturbance. The highest SOC stock (59.79 Mg ha À1 ) was observed in paddy soils, indicating its greater SOC sequestration potential than those of other land uses. The variance partition analysis (VPA) revealed that soil parameters resulted in 85.1% variation regarding soil aggregate stability, in which the chemical characteristics (i.e., pH, EC, exchangeable Na + , and exchangeable sodium percentage) contributed 23.1%, binding agents (SOC, exchangeable Ca 2+ , and poorly crystalline Fe/Al oxides) contributed 20.6%, and their interactions contributed 39.5%. Binding agents directly participated in soil aggregation processes by forming clay-polyvalent metal complexes, while the chemical characteristics indirectly promoted soil aggregation via increasing various binding agents.Understanding the interactions between binding agents and clay are important for promoting soil aggregate stabilization in saline-sodic soil.

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“…The other subsample was used to determine soil aggregate organic carbon. Soil water-stable aggregates (WSA) and mean weight diameter (MWD) were calculated as the indices of aggregate stability as described in Feng et al (2019).…”

Section: Soil Aggregate Fractionationmentioning

confidence: 99%

Microscale heterogeneity of soil bacterial communities under long-term fertilizations in fluvo-aquic soils

Feng

Pan

et al. 2022

Soil Ecol. Lett.

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Differently sized soil aggregates, with non-uniform distribution of space and nutrients, provide spatially heterogeneous microenvironments for microorganisms and are important for controlling microbial community ecology and biogeochemistry in soils. Here, we investigated the prokaryotic communities within different aggregate-size fractions: macroaggregate ( > 0.25 mm), microaggregate (0.053-0.25 mm) and silt + clay ( < 0.053 mm). These were isolated from fluvo-aquic soils under 39-year fertilization strategies: no fertilizer (CK), chemical fertilizer (NPK), manure fertilizer (M), and combination of manure and chemical fertilizers (MNPK). The results showed that the proportion of macroaggregate, soil aggregate-associated organic carbon (SOC) content and aggregate stability were all significantly increased by both manure and chemical fertilizations. Organic fertilizations (M and MNPK) more effectively boosted formation and stability of macroaggregates and enhanced SOC concentration than NPK. The distribution patterns of microorganisms in aggregates were primarily shaped by fertilization and aggregate size. They explained 76.9% of the variance in bacterial community compositions. Fertilizations, especially with organic fertilizers primarily transitioned bacterial communities from slow-growing oligotrophic groups (e.g., Chloroflexi) dominance to fast-growing copiotrophic groups (e.g., Proteobacteria and Bacteroidetes) dominance across all aggregate sizes. Macroaggregates possessed a more stable bacterial community and efficiency of resource transfer, while smaller aggregates increased antagonism and weakened mutualism among bacterial communities. Overall, combination of manure and chemical fertilizers was crucial for increasing SOC content and aggregation, leading to a clear shift in bacterial community structures at aggregate scale.

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Effect of land use on the composition of bacterial and fungal communities in saline–sodic soils

Cited by 27 publications

References 53 publications

Saline-alkali migration in soda saline soil based on sub-soiling technology

Saline-alkali migration in soda saline soil based on sub-soiling technology

Aggregate stability and organic carbon stock under different land uses integrally regulated by binding agents and chemical properties in saline‐sodic soils

Microscale heterogeneity of soil bacterial communities under long-term fertilizations in fluvo-aquic soils

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