Enhanced deposition of nitrate alters microbial cycling of N in a subtropical forest soil

Gao, Wenlong; Kou, Liang; Zhang, Jinbo; Müller, Christoph; Wang, Huiming; Yang, Hao; Li, Shenggong

doi:10.1007/s00374-016-1134-4

Cited by 25 publications

(9 citation statements)

References 64 publications

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“…In actuality, the PLFA method is not sensitive enough to detect phylogenetic shifts in soil microbial communities, although it is useful for detecting phenotypic changes ( Frostegård et al, 2011 ). Moreover, our observations do not deny the possibility that a different combination of N load and duration could result in microbial community shifts because soil microbial communities depend greatly on N treatment load and duration ( Treseder, 2008 ; Gao et al, 2016 ; Wang et al, 2017 ), consequently changing C cycling ( Liu and Greaver, 2010 ).…”

Section: Discussionmentioning

confidence: 57%

“…In spite of the insignificant N effects observed in this study, it is probable that soil CO 2 emissions will be depressed under high N deposition loads as the N deposition increases in this region ( Mo et al, 2008 ; Liu et al, 2013 ). Soil microbial communities could respond to atmospheric N deposition non-linearly ( Zhou et al, 2012 ; Gao et al, 2016 ), and there may be a threshold beneath which N deposition will not significantly affect the composition of the soil microbial groups ( He et al, 2016 ). Once the threshold is exceeded, the soil microbial biomass, community activities and diversity will significantly decline ( Zhou et al, 2012 ).…”

Section: Discussionmentioning

confidence: 99%

“…Once the threshold is exceeded, the soil microbial biomass, community activities and diversity will significantly decline ( Zhou et al, 2012 ). However, this threshold varies across different ecosystems and can encompass 2- to 10-fold of the atmospheric N deposition load in studied ecosystems ( Mo et al, 2008 ; Gao et al, 2016 ; He et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

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Exogenous Nitrogen Addition Reduced the Temperature Sensitivity of Microbial Respiration without Altering the Microbial Community Composition

Wei

Chen

et al. 2017

Front. Microbiol.

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Atmospheric nitrogen (N) deposition is changing in both load quantity and chemical composition. The load effects have been studied extensively, whereas the composition effects remain poorly understood. We conducted a microcosm experiment to study how N chemistry affected the soil microbial community composition characterized by phospholipid fatty acids (PLFAs) and activity indicated by microbial CO2 release. Surface and subsurface soils collected from an old-growth subtropical forest were supplemented with three N-containing materials (ammonium, nitrate, and urea) at the current regional deposition load (50 kg ha-1 yr-1) and incubated at three temperatures (10, 20, and 30°C) to detect the interactive effects of N deposition and temperature. The results showed that the additions of N, regardless of form, did not alter the microbial PLFAs at any of the three temperatures. However, the addition of urea significantly stimulated soil CO2 release in the early incubation stage. Compared with the control, N addition consistently reduced the temperature dependency of microbial respiration, implying that N deposition could potentially weaken the positive feedback of the warming-stimulated soil CO2 release to the atmosphere. The consistent N effects for the surface and subsurface soils suggest that the effects of N on soil microbial communities may be independent of soil chemical contents and stoichiometry.

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Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Exogenous Nitrogen Addition Reduced the Temperature Sensitivity of Microbial Respiration without Altering the Microbial Community Composition

Wei

Chen

et al. 2017

Front. Microbiol.

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“…Increased N inputs have the potential to alter various biogeochemical processes of N in ecosystems, resulting in changes in ecosystem structure and functioning. In China, various manipulation experiments have been conducted to clarify the impact of N addition on soil microbial N processes Gao et al, 2016aGao et al, , 2016bGao et al, , 2016cKou et al, 2019b, plant N nutrition Kou et al, 2018a, root growth and dynamics Kou et al, 2015, 2017a, 2017b, 2018b, 2019a , and greenhouse gas emissions Gao et al, 2018;Zhao et al, 2018;Zhou et al, 2016 . For Fig.…”

Section: Nitrogen Biogeochemical Cyclementioning

confidence: 99%

Recent advances in the understanding of ecosystem processes at eddy covariance CO<SUB>2</SUB> flux sites in East Asian forest ecosystems: a review

Chang

Saitoh

Shibata

et al. 2021

J. Agric. Meteorol.

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To elucidate the dynamic features of carbon sequestration in ecosystems under changing climates and various disturbance regimes, researchers must understand key ecosystem processes, such as carbon allocation and partitioning, organic matter decomposition, and nutrient cycles, as well as plant functional traits. Here, we reviewed the existing literature and conducted meta-analyses using available datasets from eddy covariance CO 2 flux sites in East Asia to clarify these ecosystem processes and attributes. Since the establishment of AsiaFlux in 1999, the number of flux tower sites has grown to 110 sites, spanning a large geographic extent in East Asia and covering diverse ecosystems embedded in large climatic gradients. Early publications relating to AsiaFlux described CO 2 fluxes from single sites, but over the last 20 years more ecosystem processes and attributes have been included in the study sites' research programs. Among other advances, researchers have quantified the plant functional traits related to photosynthesis or ecosystem-scale gross primary production and thus demonstrated that CO 2 fluxes are controlled by plant traits; this quantification provides a basis for building ecosystem models. Additional means of understanding the carbon fluxes and pools of these ecosystems have been provided by biometric measurements beneath eddy covariance flux towers, partly on the basis of traditional forestry practices and the measurements of component carbon fluxes, such as respiratory fluxes and litter decomposition rates. Through meta-analyses, we demonstrate good correlations between these fluxes and mention the characteristics of carbon cycle processes in Asian forest ecosystems. By investigating nitrogen biogeochemical cycles at the flux sites, studies have shown that carbon fluxes are also controlled by nitrogen availability. The future success and progress of AsiaFlux could be promoted by further collaborations between this research community and other networks, such as long-term ecological research LTER networks, and the development of open databases.

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“…The addition of NH4 + can significantly increase the substrates for ammonia-oxidizers and the abundance of ammonia-oxidizing archaea, which give rise to increases in soil autotrophic nitrification rate (Gao et al, 2016a;2016b). The other reason is that 200 additions of NH4 + fertilizers can have larger impacts on the acidification of soil compared with the additions of NO3 -, which is closely related to the accumulation of H + in soil solution and the leaching of NO3 -from soil (Tian and Niu, 2015).…”

Section: Model Performancementioning

confidence: 99%

Impacts of Nitrogen Addition on Nitrous Oxide Emission: Model-Data Comparison

Zhang

Fang

et al. 2018

Preprint

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Abstract.The contributions of long-lived nitrous oxide (N2O) to the global climate and environment have received increasing attention. Especially, atmospheric nitrogen (N) deposition has substantially increased in recent decades due to extensive use of fossil fuels in industry, which strongly stimulates the N2O emissions of the terrestrial ecosystem. Several models have been developed to simulate N2O emission, but there are still large differences in their N2O emission simulations and 15 responses to atmospheric deposition over global or regional scales. Using observations from N addition experiments in a subtropical forest, this study compared six widely-used N2O models (i.e. DayCENT, DLEM, DNDC, DyN, NOE, and NGAS) to investigate their performances for reproducing N2O emission, and especially the impacts of two types of N additions (i.e. ammonium and nitrate: NH4 + and NO3 -, respectively) and two levels (low and high) on N2O emission. In general, the six models reproduced the seasonal variations of N2O emission, but failed to reproduce relatively larger N2O emissions due to 20 NH4 + compared to NO3 -additions. Few models indicated larger N2O emission under high N addition levels for both NH4 + and NO3 -. Moreover, there were substantial model differences for simulating the ratios of N2O emission from nitrification and denitrification processes due to disagreements in model structures and algorithms. This analysis highlights the need to improve representation of N2O production and diffusion, and the control of soil water-filled pore space on these processes in order to simulate the impacts of N deposition on N2O emission. 25

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Enhanced deposition of nitrate alters microbial cycling of N in a subtropical forest soil

Cited by 25 publications

References 64 publications

Exogenous Nitrogen Addition Reduced the Temperature Sensitivity of Microbial Respiration without Altering the Microbial Community Composition

Exogenous Nitrogen Addition Reduced the Temperature Sensitivity of Microbial Respiration without Altering the Microbial Community Composition

Recent advances in the understanding of ecosystem processes at eddy covariance CO<SUB>2</SUB> flux sites in East Asian forest ecosystems: a review

Impacts of Nitrogen Addition on Nitrous Oxide Emission: Model-Data Comparison

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