Saltwater intrusion induces shifts in soil microbial diversity and carbon use efficiency in a coastal grassland ecosystem

Brown, Robert W.; Rhymes, Jennifer; Jones, Davey L.

doi:10.1016/j.soilbio.2022.108700

Cited by 16 publications

(3 citation statements)

References 95 publications

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“…In this study, salt stress increased the relative abundance of rhizosphere bacterial carbon and sulfur cycle groups in T. chinensis , and it has been shown that changes in the carbon cycle group are more pronounced in the rhizosphere in response to salinity stress [ 44 ]. This may be caused by the effects of salt stress on the plant root system, resulting in an increase in plant root residues and changes in soil structure [ 45 ]. It has also been reported that the increase in the abundance of genes related to rhizosphere carbon and sulfur cycling under salt stress may mitigate the negative effects of salt on plants [ 46 ].…”

Section: Discussionmentioning

confidence: 99%

Response of Phyllosphere and Rhizosphere Microbial Communities to Salt Stress of Tamarix chinensis

Qu,

Pan,

Wang

et al. 2024

Plants

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As carriers of direct contact between plants and the atmospheric environment, the microbiomes of phyllosphere microorganisms are increasingly recognized as an important area of study. Salt secretion triggered by salt-secreting halophytes elicits changes in the community structure and functions of phyllosphere microorganisms, and often provides positive feedback to the individual plant/community environment. In this study, the contents of Na+ and K+ in the rhizosphere, plant and phyllosphere of Tamarix chinensis were increased under 200 mmol/L NaCl stress. The increase in electrical conductivity, Na+ and K+ in the phyllosphere not only decreased the diversity of bacterial and fungal communities, but also decreased the relative abundance of Actinobacteriota and Basidiomycota. Influenced by electrical conductivity and Na+, the bacteria–fungus co-occurrence network under salt stress has higher complexity. Changes in the structure of the phyllosphere microbial community further resulted in a significant increase in the relative abundance of the bacterial energy source and fungal pathotrophic groups. The relative abundance of Actinobacteriota and Acidobacteriota in rhizosphere showed a decreasing trend under salt stress, while the complexity of the rhizosphere co-occurrence network was higher than that of the control. In addition, the relative abundances of functional groups of rhizosphere bacteria in the carbon cycle and phosphorus cycle increased significantly under stress, and were significantly correlated with electrical conductivity and Na+. This study investigated the effects of salinity on the structure and physicochemical properties of phyllosphere and rhizosphere microbial communities of halophytes, and highlights the role of phyllosphere microbes as ecological indicators in plant responses to stressful environments.

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Section: Discussionmentioning

confidence: 99%

Response of Phyllosphere and Rhizosphere Microbial Communities to Salt Stress of Tamarix chinensis

Qu,

Pan,

Wang

et al. 2024

Plants

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“…Changing microbial communities can alleviate environmental stress and promote plant growth (Xu et al., 2023b). Soil microorganisms are an important part of the grassland ecosystem, and play an irreplaceable role in regulating plant growth, promoting the formation of soil structure, and maintaining the function and stability of the grassland ecosystem (Brown et al., 2022). Therefore, some studies have shown the responses of soil microbial community to grassland degradation (Chao et al., 2022; Wang, Wen, et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Fertilization can accelerate the pace of soil microbial community response to rest‐grazing duration in the three‐river source region of China

Zhou,

Wang,

et al. 2023

Ecology and Evolution

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Overgrazing leads to grassland degradation and productivity decline. Rest‐grazing during the regreen‐up period can quickly restore grassland and fertilization is a common restoration strategy. However, the effects of rest‐grazing time and fertilization on soil microorganisms are unclear in the alpine grasslands. Therefore, the experiment of rest‐grazing time and fertilization was carried out to explore the response of soil microorganisms to rest‐grazing time and fertilization measures. A field control experiment with rest‐grazing time and fertilization as factors have been conducted from the time when grass returned to green till the livestock moved to the summer pasture in Dawu Town of Maqin County of China. The primary treatment we established was the five rest‐grazing time, including rest‐grazing time of 20 days, 30 days, 40 days, 50 days, and traditional grazing was used as a check group. At the same time, the secondary treatment was nitrogen addition of 300 kg·hm−2 in each primary treatment. The results showed that the total phospholipid fatty acid (total PLFA), actinomyces (Act), and arbuscular mycorrhizal fungi (AMF) showed an ever‐increasing biomass with the increase of rest‐grazing time and the highest was at 50 days of rest‐grazing, and they were all significantly higher than CK. In addition, soil microbial biomass carbon‐nitrogen ratio (MBC/MBN) had great influence on the change of microbial community. Applying nitrogen fertilizer can increase the maximum value of biomass of all PLFA groups and the biomass of all PLFA groups changed in an “inverted V” shape with the increase of rest‐grazing time. Besides, instead of MBC/MBN, NO3−‐N was positively correlated with the biomass of all PLFA groups, which actively regulated the trend of microbial functions. The longer rest‐grazing time is more conducive to the biomass of all PLFA groups. However, applying nitrogen fertilizer could break this pattern, namely, the 30 days rest‐grazing would be beneficial to the biomass of all PLFA groups. These findings provide key information that rest‐grazing during the regreen‐up period is benefiscial to the all PLFA groups and fertilization could change the response of microorganisms to rest‐grazing, which provide reference measures for the restoration of degraded alpine meadows.

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“…High salinity and pH alter the species composition of soil microorganisms and plants as well as affect the dynamic balance between soil organic carbon (SOC) storage and soil respiration, which increases the ambiguity surrounding climate change [3,4]. Moreover, soil salinization has emerged as a critical environmental issue that threatens ecosystem balance, agricultural productivity, human health, and sustainable development [5,6]. Therefore, urgent and effective measures should be taken for the prevention of salinization and improvement of saline-alkali land in arid areas.…”

Section: Introductionmentioning

confidence: 99%

Effects of Biochar and Organic Additives on CO2 Emissions and the Microbial Community at Two Water Saturations in Saline–Alkaline Soil

Zhang

Jiang

et al. 2023

Agronomy

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The nutrient-limiting conditions in saline–alkali soil as well as the salinity and alkalinity stress are successfully alleviated by water management measures and the addition of organic matter. However, the impacts of these two strategies on the microbe-driven CO2 emissions in saline–alkaline soils are not yet clear. Therefore, a 150-day incubation experiment was conducted in this study to evaluate the short-term effects of water regulation and the addition of organic matter with different characteristics on CO2 emissions and microbial community characteristics in saline–alkali soils under non-flooding conditions. This study was conducted at two water saturations, i.e., 50% WFPS and 80% WFPS. In addition, five organic matter treatments were conducted: CK: control; N: urea; SN: Straw + urea; SNH: Straw + urea + microbial agent; and SNB: Straw + urea + biochar. The results demonstrated that compared with 50% WFPS, 80% WFPS significantly increased cumulative CO2 emission by 27.66%, but significantly decreased salt content and the fungal Chao1 and Shannon indices. The application of the biochar and microbial agent decreased the cumulative CO2 emissions of the SN treatment by 27.39% and 14.92%, respectively. When sufficient carbon supply is available, the decrease in fungal diversity may reduce CO2 emission. The findings demonstrated that SNH and SNB at 80% WFPS might decrease CO2 emissions under straw carbon intake as well as the loss of labile organic carbon (LOC). Additionally, these treatments can alleviate microbial stress caused by salinity, which has a favorable impact on enhancing carbon storage in salinity-affected dryland soils.

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Saltwater intrusion induces shifts in soil microbial diversity and carbon use efficiency in a coastal grassland ecosystem

Cited by 16 publications

References 95 publications

Response of Phyllosphere and Rhizosphere Microbial Communities to Salt Stress of Tamarix chinensis

Response of Phyllosphere and Rhizosphere Microbial Communities to Salt Stress of Tamarix chinensis

Fertilization can accelerate the pace of soil microbial community response to rest‐grazing duration in the three‐river source region of China

Effects of Biochar and Organic Additives on CO2 Emissions and the Microbial Community at Two Water Saturations in Saline–Alkaline Soil

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