The effect of C:N ratio on heterotrophic nitrification in acidic soils

Zhang, Yi; Wang, Jing; Dai, Shenyan; Zhao, Jun; Huang, Xinqi; Sun, Yongquan; Chen, Ji; Cai, Zucong; Zhang, Jinbo

doi:10.1016/j.soilbio.2019.107562

Cited by 43 publications

(13 citation statements)

References 71 publications

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“…Moreover, we observed a significant and negative relationship between C:N and GHN in croplands. This is in line with former studies that recorded a higher GHN in croplands with relatively lower C:N than forest soils (Chen et al, 2015; Zhang, Wang, et al, 2019). Thus, other factors such as the composition of the soil organic C may regulate GHN.…”

Section: Discussionsupporting

confidence: 93%

Global gross nitrification rates are dominantly driven by soil carbon‐to‐nitrogen stoichiometry and total nitrogen

Elrys

Wang

Metwally

et al. 2021

Global Change Biology

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126

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Soil gross nitrification (GN) is a critical process in the global nitrogen (N) cycle that results in the formation of nitrate through microbial oxidation of ammonium or organic N, and can both increase N availability to plants and nitrous oxide emissions. Soil GN is thought to be mainly controlled by soil characteristics and the climate, but a comprehensive analysis taking into account the climate, soil characteristics, including microbial characteristics, and their interactions to better understand the direct and indirect controlling factors of GN rates globally is lacking. Using a global meta‐analysis based on 901 observations from 330 15N‐labeled studies, we show that GN differs significantly among ecosystem types, with the highest rates found in croplands, in association with higher pH which stimulates nitrifying bacteria activities. Autotrophic and heterotrophic nitrifications contribute 63% and 37%, respectively, to global GN. Soil GN increases significantly with soil total N, microbial biomass, and soil pH, but decreases significantly with soil carbon (C) to N ratio (C:N). Structural equation modeling suggested that GN is mainly controlled by C:N and soil total N. Microbial biomass and pH are also important factors controlling GN and their effects are similar. Precipitation and temperature affect GN by altering C:N and/or soil total N. Soil total N and temperature drive heterotrophic nitrification, whereas C:N and pH drive autotrophic nitrification. Moreover, GN is positively related to nitrous oxide and carbon dioxide emissions. This synthesis suggests that changes in soil C:N, soil total N, microbial population size, and/or soil pH due to anthropogenic activities may influence GN, which will affect nitrate accumulation and gaseous emissions of soils under global climate and land‐use changes.

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Section: Discussionsupporting

confidence: 93%

Global gross nitrification rates are dominantly driven by soil carbon‐to‐nitrogen stoichiometry and total nitrogen

Elrys

Wang

Metwally

et al. 2021

Global Change Biology

Self Cite

126

View full text Add to dashboard Cite

show abstract

“…The correlation between N and soil pH is negative because, in soil, N forms ammonium (NH 4 + ) and undergoes nitrification by microorganisms present in the hydrogen (H + ) in the environment, which is related to an increase in soil acidity. The correlation of N to soil pH is in accordance with the relationship between soil pH and the C/N ratio (r = 0.690; p < 0.01), so soil pH is possibly affected by heterotrophic nitrification because a neutral soil pH (pH 6-7) is suitable for microorganism activity (Zhang et al, 2019).…”

Section: Relationship Of Some Elements To Acidic Soilsupporting

confidence: 68%

Evaluation of Properties and Elements in the Surface of Acidic Soil in the Central Region of Thailand

Kroeksakul¹,

Ngamniyom²,

Silprasit³

et al. 2021

JTAS

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The study aimed to evaluate and correlate acidic soil components to understand the phenomena of this type of soil. The soil samples were collected from 64 locations in 3 provinces of central Thailand and were tested for soil pH, element content, soil organic matter (SOM), and soil organic carbon (SOC). The results show that soil acidity in central Thailand has an average pH of 4.71 ± 0.87. The soil acidity level ranges from very strongly acidic in Phatum Thani and Nakhon Nayok provinces to strongly acidic in Chachoengsao province. Soil bulk density is about 0.34 g/cm3, and the correlation of soil pH to lead (Pb), nickel (Ni), nitrogen (N), carbon-to-nitrogen ratio (C/N ratio), and zinc (Zn) is as follows: principle component 1 (PC1) is carbon-to-nitrogen ratio > pH > zinc (C/N ratio > pH > Zn), and principle component 2 (PC2) is soil organic carbon > bulk density > soil organic matter (SOC > BD > SOM). Soil pH, SOM, and SOC are in similar groups. The soil abundance at the study site was compared with the ideal soil for plants, and heavy metal contamination in the acidic soil of the central region did not exceed the standard limit. The study found a correlation between SOM and SOM (r = 0.715; p < 0.01), indicating soil quality and microbial activity.

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“…Nitrification is mainly accomplished by nitrifying bacteria such as Nitrosomonas – a chemoautotrophic bacterium – which oxidizes ammonia to nitrous acid ( Purkhold et al, 2003 ; Marsh et al, 2005 ), and Nitrospira , which is involved in the process of nitrite oxidation ( Meincke et al, 1992 ; Angel et al, 2010 ). In this study, the relative abundance of Nitrosomonas in rhizosphere and bulk soil samples showed a negative correlation with increasing levels of N fertilization, whereas the relative abundance of Nitrospira in rhizosphere and bulk soil showed positive and negative correlations with increasing N fertilization, respectively, which may associated with heterotrophic nitrification performed by a wide range of microorganisms, such as heterotrophic bacteria, fungi, and actinomycetes ( Zhang Y. et al, 2019 ; Qiao et al, 2020 ). These findings, in combination with the results of FAPROTAX analysis, revealed that bacteria with N fixation and nitrification functions – including ammonia and nitrite oxidation – were decreased in bulk soil with increased N application.…”

Section: Discussionmentioning

confidence: 63%

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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The effect of C:N ratio on heterotrophic nitrification in acidic soils

Cited by 43 publications

References 71 publications

Global gross nitrification rates are dominantly driven by soil carbon‐to‐nitrogen stoichiometry and total nitrogen

Global gross nitrification rates are dominantly driven by soil carbon‐to‐nitrogen stoichiometry and total nitrogen

Evaluation of Properties and Elements in the Surface of Acidic Soil in the Central Region of Thailand

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

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