Nitrogen addition alters composition, diversity, and functioning of microbial communities in mangrove soils: An incubation experiment

Craig, Hayley; Antwis, Rachael E.; Cordero, Irene; Ashworth, Deborah; Robinson, Clare H.; Osborne, Todd Z.; Bardgett, Richard D.; Rowntree, Jennifer K.; Simpson, Loraé T.

doi:10.1016/j.soilbio.2020.108076

Cited by 49 publications

(26 citation statements)

References 76 publications

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“…Considering that aerobic fungi are the primary decomposers of plant biomass ( Da Silva et al, 2017 ), it was therefore not surprising that fungal species diversity was higher and richness was greater in the more oxygenated rhizosphere soil. Conversely, the species diversity and richness of bacteria had decreased significantly with an increase in N fertilization, which is consistent with the findings of Craig et al (2021) . Through the taxonomic annotation of bacterial and fungal communities, we found that N fertilization had a variable impact on the composition of such communities in the soil; notably, increased N fertilization had a greater effect on the composition of fungal communities.…”

Section: Discussionsupporting

confidence: 89%

Rhizosphere-Associated Microbiomes of Rice (Oryza sativa L.) Under the Effect of Increased Nitrogen Fertilization

Dong

Sun

et al. 2021

Front. Microbiol.

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Crops assemble and rely on rhizosphere-associated microbiomes for plant nutrition, which is crucial to their productivity. Historically, excessive nitrogen fertilization did not result in continuously increasing yields but rather caused environmental issues. A comprehensive understanding should be developed regarding the ways in which crops shape rhizosphere-associated microbiomes under conditions of increased nitrogen fertilization. In this study, we applied 16S and 18S ribosomal RNA gene profiling to characterize bacterial and fungal communities in bulk and rhizosphere soil of rice subjected to three levels of nitrogen fertilization for 5 years. Soil biochemical properties were characterized, and carbon-, nitrogen-, and phosphorus-related soil enzyme activities were investigated, by assays. Increasing nitrogen fertilization led to a decreasing trend in the variation of microbial community structures and demonstrated a more definite influence on fungal rather than bacterial community compositions and functions. Changes in the level of nitrogen fertilization significantly affected chemical properties such as soil pH, nutrient content, and microbial biomass levels in both rhizosphere and bulk soil. Soil enzyme activity levels varied substantially across nitrogen fertilization intensities and correlated more with the fungal than with the bacterial community. Our results indicated that increased nitrogen input drives alterations in the structures and functions of microbial communities, properties of soil carbon, nitrogen, and phosphorus, as well as enzyme activities. These results provide novel insights into the associations among increased nitrogen input, changes in biochemical properties, and shifts in microbial communities in the rhizosphere of agriculturally intensive ecosystems.

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Section: Discussionsupporting

confidence: 89%

Rhizosphere-Associated Microbiomes of Rice (Oryza sativa L.) Under the Effect of Increased Nitrogen Fertilization

Dong

Sun

et al. 2021

Front. Microbiol.

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“…However, excess nitrogen in the high level of N addition decreased the soil pH, which increased the biological toxicity of exchangeable aluminum ions (Vanguelova et al 2007, Tu et al 2015. The efficiency of conversion of plant carbon and nitrogen into microbial biomass carbon and nitrogen reduced under the high level of N addition (Craig et al 2021). So soil MBC and soil MBN declined with the increase of N addition.…”

Section: Resultsmentioning

confidence: 99%

Effects of nitrogen addition on root traits and soil nitrogen in the long-term restored grasslands

Jing¹,

Chen²,

Lu³

et al. 2021

PLANT SOIL ENVIRON

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Fine root traits are plastic and responsive to increased nitrogen (N) deposition. However, with the restoring of the ecosystem after grain for green, little research has been reported about the response of root traits in a long-term restored ecosystem to increased N deposition. Therefore, a successive N addition experiment was conducted in a long-term restored grassland on the Loess Plateau to analyse the effects of different N addition levels (0, 2.5, 5, 10, 20 g N/m2/year) on root morphological traits, soil carbon (C) and N. Our results showed that root morphological traits (except for root diameter) firstly increased and then declined, with the maximum in the N level of 5 g/m2/year. N addition significantly increased soil organic carbon, total nitrogen, ammonium nitrogen (NH4+-N) and nitrate-nitrogen (NO3–-N) with the increasing N addition level, especially in the soil surface layer. Specific root length and specific root area had remarkable negative correlations with NO3–-N, while root diameter and root length density had positive correlations with soil availability N and soil microbial biomass carbon. This study indicated that plants could have the threshold response to adapt to the N addition and prefer to slowly grow rather than quickly invest and return in order to adapt to the environmental stress.

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“…This suggests that this environment may have become more eutrophic due to the constant exposure to urban tailings, as observed in locu, which results in greater biomass production and biodiversity (Fernandes et al, 2014;Glibert, 2017). While some studies that use incubation or microcosm approaches have observed decreasing microbial diversity as a result of nutrient addition, in experiments with coastal soils (Aoyagi et al, 2015;Wang, Huang & Zheng, 2016;Bulseco et al, 2019;Craig et al, 2021), our study relied on field sediments which are continually exposed to anthropogenic presence, as such, would be expected to differ from controlled microcosms.…”

Section: Discussionmentioning

confidence: 99%

Large-scale differences in diversity and functional adaptations of prokaryotic communities from conserved and anthropogenically impacted mangrove sediments in a tropical estuary

Santana

Spealman

Melo

et al. 2021

PeerJ

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Mangroves are tropical ecosystems with strategic importance for climate change mitigation on local and global scales. They are also under considerable threat due to fragmentation degradation and urbanization. However, a complete understanding of how anthropogenic actions can affect microbial biodiversity and functional adaptations is still lacking. In this study, we carried out 16S rRNA gene sequencing analysis using sediment samples from two distinct mangrove areas located within the Serinhaém Estuary, Brazil. The first sampling area was located around the urban area of Ituberá, impacted by domestic sewage and urban runoff, while the second was an environmentally conserved site. Our results show significant changes in the structure of the communities between impacted and conserved sites. Biodiversity, along with functional potentials for the cycling of carbon, nitrogen, phosphorus and sulfur, were significantly increased in the urban area. We found that the environmental factors of organic matter, temperature and copper were significantly correlated with the observed shifts in the communities. Contributions of specific taxa to the functional potentials were negatively correlated with biodiversity, such that fewer numbers of taxa in the conserved area contributed to the majority of the metabolic potential. The results suggest that the contamination by urban runoff may have generated a different environment that led to the extinction of some taxa observed at the conserved site. In their place we found that the impacted site is enriched in prokaryotic families that are known human and animal pathogens, a clear negative effect of the urbanization process.

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Nitrogen addition alters composition, diversity, and functioning of microbial communities in mangrove soils: An incubation experiment

Cited by 49 publications

References 76 publications

Rhizosphere-Associated Microbiomes of Rice (Oryza sativa L.) Under the Effect of Increased Nitrogen Fertilization

Rhizosphere-Associated Microbiomes of Rice (Oryza sativa L.) Under the Effect of Increased Nitrogen Fertilization

Effects of nitrogen addition on root traits and soil nitrogen in the long-term restored grasslands

Large-scale differences in diversity and functional adaptations of prokaryotic communities from conserved and anthropogenically impacted mangrove sediments in a tropical estuary

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