Effects of simulated nitrogen deposition on soil microbial community diversity in coastal wetland of the Yellow River Delta

Lu, Guanru; Xie, Baohua; Cagle, Grace A.; Wang, Xuehong; Han, Guoqi; Wang, Xiaojie; Hou, Aixin; Guan, Bo

doi:10.1016/j.scitotenv.2020.143825

Cited by 52 publications

(31 citation statements)

References 55 publications

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“…Microbial structures or communities, basically bacteria, of the water system contribute significantly to the aquatic ecosystem due to their role in biogeochemical processes ( Han et al, 2019 ). Such communities have a high diversity level that enhances their function and stability ( Lu et al, 2020 ). However, the abundance of microbial communities is highly affected by their microenvironment as well as other ecological factors ( Gibbons et al, 2014 ).…”

Section: Discussionmentioning

confidence: 99%

Metagenomic analysis of bacterial communities of Wadi Namar Lake, Riyadh, Saudi Arabia

Alotaibi

Mohammed

Eltom

2022

Saudi Journal of Biological Sciences

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Section: Discussionmentioning

confidence: 99%

Metagenomic analysis of bacterial communities of Wadi Namar Lake, Riyadh, Saudi Arabia

Alotaibi

Mohammed

Eltom

2022

Saudi Journal of Biological Sciences

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“…During the last several decades, the delta has experienced changes attributed to the agricultural exploration, urban residential area expansion and petroleum refining. Those environmental changes cause the deterioration of the structure and function of wetland ecosystems (Lu et al, 2021), especially wetland degradation and disappearance (Deng, 2020; Meng et al, 2019). Wetland degradation in this area enhances the complexity and spatial heterogeneity of isolated wetlands with the surrounding water bodies, which results in negative hydrological responses (Zhu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effects of roots systems on hydrological connectivity below the soil surface in the Yellow River Delta wetland

et al. 2021

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In this study, a new method based on field dye-tracing experiments was used to assess hydrological connectivity below the soil surface. In this method, Phragmites australis in the Yellow River Delta wetland was considered to characterize the interaction between roots systems and hydrological connectivity. The results showed that index of hydrological connectivity (IHC) declined non-linearly with depth below the soil surface. Roots systems of P. australis were mostly distributed in soils of 0-30 cm.Roots systems parameters (root length, root width, root surface area, root projected area, root volume and root biomass) were positively correlated with IHC. Coarse roots systems (3 < D < 5 mm) made the highest contribution to the changes of IHC.This study provided suggestions for wetland management in the study area: (1) Reeds should not be reaped every year to promote the litters decomposition for roots nutrition availability; and (2) freshwater inputs should be strengthened in the initial/ middle growth stage of reeds to improve roots architecture. Knowledge about the interaction between roots systems and hydrological connectivity below the soil surface is crucial for large-scale wetland protection as wetland managers regulate the control and distribution of vegetation.

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“…Soil acidification caused by nitrogen addition can reduce bacterial, fungal, and actinobacteria biomass (Chen et al, 2015) as well as bacterial diversity (Zhou et al, 2022). In a non-tidal coastal wetland nitrogen addition experiment, Lu et al (2021) also found that soil TC was one of the most crucial factors influencing soil bacterial diversity. Thus, soil acidification and resource availability contributed to the altered bacterial composition following nitrogen addition.…”

Section: Discussionmentioning

confidence: 88%

Nitrogen addition alters plant growth in China’s Yellow River Delta coastal wetland through direct and indirect effects

et al. 2022

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In the coastal wetland, nitrogen is a limiting element for plant growth and reproduction. However, nitrogen inputs increase annually due to the rise in nitrogen emissions from human activity in coastal wetlands. Nitrogen additions may alter the coastal wetlands’ soil properties, bacterial compositions, and plant growth. The majority of nitrogen addition studies, however, are conducted in grasslands and forests, and the relationship between soil properties, bacterial compositions, and plant growth driven by nitrogen addition is poorly understood in coastal marshes. We conducted an experiment involving nitrogen addition in the Phragmites australis population of the tidal marsh of the Yellow River Delta. Since 2017, four nitrogen addition levels (N0:0 g • m-2 • year-1, N1:5 g • m-2 • year-1, N2:20 g • m-2 • year-1, N3:50 g • m-2 • year-1) have been established in the experiment. From 2017 to 2020, we examined soil properties and plant traits. In 2018, we also measured soil bacterial composition. We analyzed the effect of nitrogen addition on soil properties, plant growth, reproduction, and plant nutrients using linear mixed-effect models. Moreover, structural equation modeling (SEM) was utilized to determine the direct and indirect effects of nitrogen addition, soil properties, and bacterial diversity on plant growth. The results demonstrated that nitrogen addition significantly affected plant traits of P. australis. N1 and N2 levels generally resulted in higher plant height, diameter, leaf length, leaf breadth, and leaf TC than N0 and N3 levels. Nitrogen addition had significantly impacted soil properties, including pH, salinity, soil TC, and soil TS. The SEM revealed that nitrogen addition had a direct and positive influence on plant height. By modifying soil bacterial diversity, nitrogen addition also had an small indirect and positive impact on plant height. However, nitrogen addition had a great negative indirect impact on plant height through altering soil properties. Thus, nitrogen inputs may directly enhance the growth of P. australis at N1 and N2 levels. Nonetheless, the maximum nitrogen addition (N3) may impede P. australis growth by reducing soil pH. Therefore, to conserve the coastal tidal marsh, it is recommended that an excess of nitrogen input be regulated.

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Effects of simulated nitrogen deposition on soil microbial community diversity in coastal wetland of the Yellow River Delta

Cited by 52 publications

References 55 publications

Metagenomic analysis of bacterial communities of Wadi Namar Lake, Riyadh, Saudi Arabia

Metagenomic analysis of bacterial communities of Wadi Namar Lake, Riyadh, Saudi Arabia

Effects of roots systems on hydrological connectivity below the soil surface in the Yellow River Delta wetland

Nitrogen addition alters plant growth in China’s Yellow River Delta coastal wetland through direct and indirect effects

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