Nitrogen deposition to forest ecosystems with focus on its different forms

Hůnová, Iva; Kurfurst, P J; Stráník, Vojtěch; Modlík, Miloslav

doi:10.1016/j.scitotenv.2016.09.140

Cited by 24 publications

(11 citation statements)

References 39 publications

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“…Previous studies demonstrate that atmospheric N deposition can positively, negatively, or not affect SOC decomposition in different ecosystems, with the responses controlled by other factors (such as soil substrate supply and forest productivity) (Janssens et al., 2010; Eberwein et al., 2015; Chen et al., 2019). Compared with the increasing atmospheric N load, changes in the deposited N species have received little attention, although they have been widely observed (Liu et al., 2013; Hunova et al., 2017). Furthermore, warming and N deposition may interactively affect SOC decomposition (Eberwein et al., 2017; Fang et al., 2018), and the response of SOC decomposition to N deposition likely depends on the input N species (Wang et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

Warming but Not Nitrogen Addition Alters the Linear Relationship Between Microbial Respiration and Biomass

Wei

Chen

et al. 2019

Front. Microbiol.

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Soil contains a large amount of organic matter, which constitutes the largest terrestrial carbon pool. Heterotrophic or microbial respiration (R h ) that results from microbial decomposition of soil organic carbon (SOC) constitutes a substantial proportion of soil C efflux. Whether soil microbial biomass is of primary importance in controlling R h remains under debate, and the question of whether the microbial biomass-decomposition relationship changes with warming and nitrogen (N) deposition has rarely been assessed. We conducted an incubation experiment to test the relationship between R h and the size of soil microbial communities in two layers of soil collected from a natural subtropical forest and to examine whether the relationship was affected by changes in temperature and by added N in different forms. The results showed that regardless of the added N species, the N load did not significantly affect R h or the size of the soil microbial communities. These results could be due to a long-term N-rich soil condition that acclimates soil microbial communities to resist N inputs into the studied forest; however, warming may significantly stimulate SOC decomposition, reducing soil microbial biomass under high temperatures. A significant linear soil microbial biomass-decomposition relationship was observed in our study, with the coefficients of determination ranging from 54 to 70%. Temperature rather than N additions significantly modified the linear relationship between soil microbial biomass and respiration. These results suggest that warming could impose a more substantial impact than N addition on the relationship between soil microbial biomass and SOC decomposition.

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Section: Introductionmentioning

confidence: 99%

Warming but Not Nitrogen Addition Alters the Linear Relationship Between Microbial Respiration and Biomass

Wei

Chen

et al. 2019

Front. Microbiol.

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“…In many regions of the developed world, NO x emissions have steadily declined since around 1990 (Leip et al, 2011) while emissions of NH 3 have remained constant or increased slightly, such as in the United States where NH 3 emissions have increased by 11% (Bytnerowicz et al, 2016;Hertel et al, 2011;Xing et al, 2013). As a result, the proportion of N deposition in reduced forms in many areas of the developed world, has increased in recent years (Du et al, 2014;Hůnová et al, 2017;Li et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

On-road emissions of ammonia: An underappreciated source of atmospheric nitrogen deposition

Fenn

Bytnerowicz

Schilling

et al. 2018

Science of The Total Environment

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H I G H L I G H T S• This study documents the increasing importance of on-road emissions of NH 3.• NO x emissions control mechanisms frequently result in NH 3 production and emissions.• NH 3 is an important driver of N deposition in urban-affected areas and near roadways.• NH 4 -N:NO 3 -N ratios in urban deposition are indicative of elevated NH 3 emissions.• On-road NH 3 emissions exceed agricultural emissions where 40% of the U.S. resides. We provide updated spatial distribution and inventory data for on-road NH 3 emissions for the continental United States (U.S.) On-road NH 3 emissions were determined from on-road CO 2 emissions data and empirical NH 3 :CO 2 vehicle emissions ratios. Emissions of NH 3 from on-road sources in urbanized regions are typically 0.1-1.3 t km −2 yr −1 while NH 3 emissions in agricultural regions generally range from 0.4-5.5 t km G R A P H I C A L A B S T R A C T a b s t r a c t a r t i c l e i n f o, with a few hotspots as high as 5.5-11.2 t km −2 yr −1. Counties with higher vehicle NH 3 emissions than from agriculture include 40% of the U.S. population. The amount of wet inorganic N deposition as NH 4 + from the National Atmospheric Deposition Program (NADP) network ranged from 37 to 83% with a mean of 58.7%. Only 4% of the NADP sites across the U.S. had b45% of the N deposition as NH 4 + based on data from 2014 to 2016, illustrating the near-universal elevated proportions of NH 4 + in deposition across the U.S. Case studies of on-road NH 3 emissions in relation to N deposition include four urban sites in Oregon and Washington where the average NH 4 -N:NO 3 -N ratio in bulk deposition was 2.3. At urban sites in the greater Los Angeles Basin, bulk deposition of NH 4 -N and NO 3 -N were equivalent, while NH 4 -N:NO 3 -N in throughfall under shrubs ranged from 0.6 to 1.7. The NH 4 -N:NO 3 -N ratio at 7-10 sites in the Lake Tahoe Basin averaged 1.4 and 1.6 in bulk deposition and throughfall, and deposition of NH 4 -N was strongly correlated with summertime NH 3 concentrations. On-road

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“…In most of the previous studies, researchers have paid the most attention to the effects of N loading ( Du et al, 2014 ; BassiriRad, 2015 ). However, changes in the chemical compositions of N deposits have been recorded in many places ( Rogora et al, 2006 ; Liu et al, 2013 ; Hunova et al, 2017 ) possibly resulting from a combination of many factors, such as economic development policies, motor vehicles, the measures of reducing anthropogenic N emissions and the availability of reliable and cost-effective technologies ( Erisman et al, 2001 ; Liu et al, 2013 ). The chemical composition of N deposits could vary over season or month in a calendar year ( Fang et al, 2008 ).…”

Section: Introductionmentioning

confidence: 99%

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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Nitrogen deposition to forest ecosystems with focus on its different forms

Cited by 24 publications

References 39 publications

Warming but Not Nitrogen Addition Alters the Linear Relationship Between Microbial Respiration and Biomass

Warming but Not Nitrogen Addition Alters the Linear Relationship Between Microbial Respiration and Biomass

On-road emissions of ammonia: An underappreciated source of atmospheric nitrogen deposition

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

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