Yunting Fang

Yunting Fang
Institute of Applied Ecology, Chinese Academy of Science

PhD

About

210
Publications
52,598
Reads
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6,149
Citations
Additional affiliations
November 2012 - present
Institute of Applied Ecololgy, Chinese Academy of Sciences
Position
  • Professor (Full)
August 2008 - November 2012
Tokyo University of Agriculture and Technology
Position
  • PostDoc Position
May 2007 - February 2008
Denmark Forest and Landscape Center
Position
  • Visiting Scientist

Publications

Publications (210)
Article
Background Forest succession is an important ecological process and has been studied for more than a century. However, changes in nitrogen (N) availability during succession remain unclear as they may lead to either N saturation or N limitation. Here, we propose a conceptual model to illustrate changes in N availability during four stages of second...
Article
It is widely recommended that enhanced efficiency nitrogen fertilizers (EENFs; urease inhibitors, nitrification inhibitors, urease and nitrification inhibitors combined, coated controlled-release urea) be applied to croplands to improve N use efficiency and crop yield via regulating N transformations. However, EENFs may inevitably affect soil C dyn...
Article
Intrinsic water-use efficiency (iWUE) is a key physiological trait; however, the spatiotemporal variation in iWUE and which factors affect iWUE in the tropics and subtropics are poorly known. We determined the temporal (1920-2010) and spatial patterns of iWUE using leaf carbon-isotopic composition (δ¹³C) of 1,811 herbarium specimens and associated...
Article
Litter comprises a major nutrient source when decomposed via soil microbes and functions as subtract that limits gas exchange between soil and atmosphere, thereby restricting methane (CH4) uptake in soils. However, the impact and inherent mechanism of litter and its decomposition on CH4 uptake in soils remains unknown in forest. Therefore, to decla...
Article
Full-text available
As nitrous oxide (N2O) is one of the most important greenhouse gases, N2O emission pathways and regulation techniques in soils with different vegetation types have become a research focus. Currently, a diverse array of research exists on the N2O emissions from soils of different vegetation types, e.g., forest, grassland, and agriculture. Few studie...
Article
Denitrification-induced nitrogen (N) losses from croplands may be greatly increased by intensive fertilization. However, the accurate quantification of these losses is still challenging due to insufficient available in situ measurements of soil dinitrogen (N2) emissions. We carried out two one-week experiments in a maize-wheat cropping system with...
Article
Full-text available
Atmospheric nitrate (NO3⁻) pollution has become an obstacle to efforts to further reduce fine particulate (PM2.5) concentration in North China. However, there have been limited long‐term measurements of NO3⁻ and isotopic knowledge (δ¹⁵N, δ¹⁸O) on the driving factors during NO3⁻ changes. Here, we report observations of 10 voyages from 2014 to 2019 c...
Article
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Water use efficiency (WUE) is a key physiological trait in studying plant carbon and water relations. However, the determinants of WUE across a large geographical scale are not always clear, limiting our capacity to predict WUE in response to future global climate change. We propose that tree WUE is influenced by both calcium (Ca) availability and...
Article
Nitric oxide (NO) is a highly reactive trace gas affecting atmospheric chemistry and air quality. Although forest soils have been recognized as an important source of atmospheric NO, there are large uncertainties in global forest soil NO emission inventories (ranged from 0.03 to 8.00 kg N ha−1, averaged 1.34 ± 0.28 kg N ha−1), partly due to the pau...
Article
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Foliar stable nitrogen (N) isotopes (δ15N) generally reflect N availability to plants and have been used to infer about changes thereof. However, previous studies of temporal trends in foliar δ15N have ignored the influence of confounding factors, leading to uncertainties on its indication to N availability. In this study, we measured foliar δ15N o...
Article
Carbon dioxide (CO2), nitrous oxide (N2O), methane (CH4) and ammonia (NH3) emitted during the composting of livestock and poultry waste are important gaseous atmospheric pollutants. However, most previous studies on compost-related anthropogenic emissions of these gases were based on small reactor composting. Our understanding of their in situ emis...
Article
How forest ecosystems respond to climate warming will determine forest trajectories over the next 100 years. However, the potential effects of elevated temperature on forests remain unclear, primarily because of the absence of long‐term and large size field warming experiments in forests, especially in Asia. Here, we present the design and performa...
Article
It was previously believed that ammonia (NH3) has a short residence time in the atmosphere and cannot be transported far from its sources. In late March, however, this study observed a severe NH3 episode in urban Beijing when fertilizer was intensively applied on the North China Plain, with the highest hourly concentrations of 66.9 μg m⁻³ throughou...
Article
Full-text available
Assessment of nitrogen (N) saturation of forests is critical to the evaluation of the manner in which ecosystems will respond to current and future global changes such as N deposition. However, quantifying N saturation remains a challenge. We developed a conceptual model of N saturation stages in forest ecosystems based on (1) a hypothetical relati...
Article
Stable nitrogen isotope (δ¹⁵N) technology has often been used as a powerful tool to separate nitrogen oxides (NOx) produced by residential combustion (i.e., biomass burning and coal combustion) from other sources. However, the insufficient measurement of δ¹⁵N-NOx fingerprints of these emissions limits its application, especially in North China wher...
Article
Full-text available
The impacts of enhanced nitrogen (N) deposition on the global forest carbon (C) sink and other ecosystem services may depend on whether N is deposited in reduced (mainly as ammonium) or oxidized forms (mainly as nitrate) and the subsequent fate of each. However, the fates of the two key reactive N forms and their contributions to forest C sinks are...
Article
Full-text available
Agricultural sources and non-agricultural emissions contribute to gaseous ammonia (NH3) that plays a vital role in severe haze formation. Qualitative and quantitative contributions of these sources to ambient PM2.5 (particulate matter with an aerodynamic equivalent diameter below 2.5 µm) concentrations remains uncertain. Stable nitrogen isotopic co...
Article
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Dinitrogen gas (N2) production removes fixed N from the marine biosphere; however, questions remain over the relative influence of microbial processes in determining N2 efflux from coastal sediments. Here, we quantify N2 production processes and controlling factors along a ∼2,500 km continental shelf sediment transect of China via combined molecula...
Article
Effects of human activities on atmospheric nitrate (NO3⁻) formation remain unclear, though the knowledge is critical for improving atmospheric chemistry models and acid deposition reduction strategies. A potentially useful way to explore this is to compare NO3⁻ oxidation processes in urban and rural atmospheres based upon the oxygen stable isotope...
Article
The impacts of enhanced nitrogen (N) deposition on the global forest carbon (C) sink and other ecosystem services may depend on whether N is deposited in reduced (mainly as ammonium) or oxidized forms (mainly as nitrate) and the subsequent fate of each. However, the fates of the two key reactive N forms and their contributions to forest C sinks are...
Article
Full-text available
The preferences for different nitrogen (N) forms by plants play an important role in determining the fate and dynamics of N in ecosystems. Nevertheless, it remains unclear whether and how resource addition influences N uptake preferences of plants. Here we investigated the effects of long-term N and water addition on plant N uptake in a temperate s...
Article
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Background and aimsPlant carbon (C), nitrogen (N), phosphorus (P) levels and their stoichiometry and N uptake strategies are important aspects influencing vegetation composition and C dynamics in boreal peatlands. However, C, N and P levels and N sources of different plants remain poorly understood, which prevents a better assessment of plant respo...
Article
To explore N2O and N2 emissions from upland soils after nitrogen fertilizer application, a 60-day aerobic incubation experiment (25 ℃,80% water-filled pore space) using the 15N tracing method was conducted to quantify the N transformation, N2O and N2 emissions from maize soils from four sites (Harbin, Shenyang, Luancheng and Shouguang) and vegetabl...
Article
In addition to chemical fertilizer, plant residues or manure with low C/N ratios are usually applied to intensively cultivated agricultural systems (e.g., vegetable cultivation in the plastic shed) to prevent nutrient deficiency and soil degradation and maintain high productivity. In this study, a batch incubation study was conducted for 120 days u...
Article
Tropical forests are important contributors for N2O emissions from soil to the atmosphere; however, the microbial processes responsible for soil N2O production in tropical forest soils remain unclear. In this study, we employed a 40-day-long in situ ¹⁵NO3⁻ labeling experiment to determine the microbial processes that are responsible for N2O product...
Article
Full-text available
Fungi regulate nutrient cycling, decomposition, symbiosis, and pathogenicity in cropland soils. However, the relative importance of generalist and specialist taxa in structuring soil fungal community remains largely unresolved. We hypothesized that generalist fungi, which are adaptable to various environmental conditions, could potentially dominate...
Article
Vehicular exhaust has been identified as an important ammonia (NH3) emission source in urban areas using the stable isotope tracer technique (δ¹⁵N); however, its δ¹⁵N signature remains poorly constrained due to difficulties in concentrating and speciating NHx (NH3 + particulate NH4⁺). In this study, we deployed two active sampling techniques, MCIs...
Article
Gaseous nitrogen (N) emission [nitric oxide (NO), nitrous oxide (N2O), and nitrogen (N2)] is an important pathway of soil N loss. Nitrification and denitrification are the main processes of gaseous N production in soil. However, the contribution of heterotrophic nitrification, co-denitrification, and anammox to gaseous N production remains uncertai...
Article
Full-text available
Nitrogen (N) is one of the major nutrients limiting plant growth in terrestrial ecosystems. To avoid plant-microbe competition, previous studies on plant N uptake preference often used hydroponic experiments on fine roots of seedlings and demonstrated ammonium preference for conifer species; however, we lack information about N uptake and transloca...
Article
Full-text available
Nitrogen (N) fertilization has boosted grain production during the past century, while excess N fertilization with declining N use efficiency (NUE) has led to severe pollution in many regions. To achieve the goal of sustainable food production, Technologies and Management Practices (TMPs, e.g., optimum N application rate and methods, N‐transformati...
Article
Nitric oxide (NO) plays a critical role in atmospheric chemistry and also is a precursor of nitrate, which affects particle matter formation and nitrogen deposition. Agricultural soil has been recognized as a main source of atmospheric NO. However, quantifying the NO fluxes emitted from croplands remains a challenge and in situ long-term measuremen...
Article
Full-text available
Background Conifers partition different N forms from soil, including ammonium, nitrate, and dissolved organic N (DON), to sustain plant growth. Previous studies focused on inorganic N sources and specific amino acid forms using ¹⁵ N labelling, but knowledge of the contribution of DON to mature conifers’ N uptake is still scarce. Here, we quantified...
Article
Excessive nitrate (NO3⁻) in rivers can lead to water quality deterioration, and can also be directly input into estuaries and oceans, thus posing a serious threat to the stability of their ecosystems. In this study, the concentration, isotopes and sources of NO3⁻ in 30 rivers discharging into the Bohai Sea were comprehensively investigated. The mea...
Article
Full-text available
Nitrogen use efficiency (NUE) is a key indicator with which to study nitrogen cycles and inform nitrogen management. However, different quantification approaches may result in substantially divergent NUE values even for the same production system or for the same experimental plot. Based on our investigation of the differences between and connection...
Article
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Rainfed agriculture is one of the most common farming practices in the world and is vulnerable to global climate change. However, only limited studies have been conducted on rainfed agriculture, mainly using low-frequency manual techniques, which caused large uncertainties in estimating annual N2O emissions. In this study, we used a fully automated...
Article
Tropical forests are important contributors for N2O emissions from soil to the atmosphere; however, the microbial processes responsible for soil N2O production in tropical forest soils remain unclear. In this study, we employed a 40-day-long in situ 15NO3− labeling experiment to determine the microbial processes that are responsible for N2O product...
Article
Large anthropogenic NOx emissions increase atmospheric nitrate (NO3⁻) deposition. The China’s Clean Air Action has been implemented to reduce anthropogenic NOx emissions since 2013. To examine if atmospheric NO3⁻ deposition would decrease and its sources had changed as a result of this regulation, we collected the precipitation samples (n =181) on...
Article
Full-text available
Nitrogen-containing species are major components in atmospheric aerosols. However, little is known about the sources of N-containing aerosols over high mountainous regions, especially for organic nitrogen (ON). This study aims to reveal the emission sources of both inorganic and organic nitrogen in tropospheric aerosols atop Mt. Tai, China, and to...
Article
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Optimal methods for incorporating soil microbial mechanisms of carbon (C) cycling into Earth system models are still under debate. Specifically, whether soil microbial physiology parameters and residual materials are important to soil organic carbon content is still unclear. Here, we explored the effects of biotic and abiotic factors on soil organi...
Article
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The effects of deposited nitrogen (N) on forest ecosystems largely depend on the amount of N retained in the ecosystems and its partitioning among ecosystem pools. However, our understanding of the capacity of tropical plantations to retain deposited N is limited. To evaluate the retention of deposited N in a human-disturbed pine plantation in sout...
Article
The effects of nitrogen (N) deposition on forests largely depend on its fate after entering the ecosystem. While several studies have addressed the forest fate of N deposition using ¹⁵N tracers, the long‐term fate and redistribution of deposited N in tropical forests remains unknown. Here, we applied ¹⁵N tracers to examine the fates of deposited am...
Article
Since 2013, the Chinese government implemented the Air Pollution Prevention and Control Action Plan. As a result, the atmospheric concentrations of sulfate reduced significantly, whereas the nitrate concentrations remain relatively high due to the excess of ammonia (NH3). To date, there is no official observation network monitoring NH3 concentratio...
Article
Denitrification and anammox are the main pathways of N loss in wet habitats while their relative contribution to N2 production and underlying microbial mechanisms across marine-terrestrial ecotone remain unclear. Here we investigated the rates of anammox and denitrification, and the distribution patterns of anammox bacteria and nosZ clade I and II...
Article
Attaining greater crop productivity to feed the increasing population while minimizing the unwanted environmental consequences is challenging for nitrogen (N) management. Coated controlled-release urea (CRU) has been widely recommended in recent decades for improving crop productivity and reducing reactive N (Nr) losses. However, the overall effect...
Article
Full-text available
Nitrogen isotope (δ15N) monitoring is a potentially powerful tool in tracing atmospheric nitrogen oxides (NO x ); however, the isotopic fingerprint of vehicle exhaust remains poorly interpreted. This deficiency limits our understanding of the origin of atmospheric haze pollution, especially in China. In this study, we systemically explored the δ15N...
Article
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This study investigates the concentrations and δ¹⁵N values of NH3 in Beijing during and after the 2020 COVID-19 lockdown. Higher NH3 concentrations and lower δ¹⁵N-NH3(measured) were observed at most sites in 2020 compared to 2017. Except for a site inside a tunnel, NH3 concentrations did not increase significantly after the lockdown had ended compa...
Article
Conifers are considered to prefer to take up ammonium over nitrate. However, this conclusion is mainly based on hydroponic experiments that separate roots from soils. It remains unclear to what extent mature conifers can use nitrate compared to ammonium under field conditions where both roots and soil microbes compete for N. We conducted an in situ...
Article
Full-text available
Based on data from previous ¹⁵N‐tracer trials, Yan et al. (Global Change Biology, 26, 191–199; 2020) accounted the sources of cereal crop nitrogen (N) from fertilizer inputs (from both current and previous seasons) and possible uptake of nonfertilizer N inputs, leaving a significant part of N source undefined. We argue that the undefined N source d...
Article
Full-text available
Vehicle emissions have been identified as an important urban source of ammonia (NH3). However, there are large uncertainties regarding the contribution of vehicle emissions to urban NH3 budgets, as well as the role of NH3 in spatiotemporal fine particulate matter (PM2.5) formation and nitrogen (N) deposition patterns. The N stable isotopic composit...
Article
Denitrification and anaerobic ammonium oxidation (anammox) are two key processes in the biogeochemical cycle of nitrogen (N) and are dominant pathways of nitrate (NO3⁻) losses as N2 and N2O from soils. To verify the mechanisms of the NO3⁻ reduction comparable with the intensity of denitrification (Den) and/or anammox (Ana) processes (Den+Ana-N2) in...
Article
While growing evidence has shown the shift in terrestrial ecosystems from nitrogen (N) limitation to phosphorous (P) limitation under increasing N deposition, it is poorly understood how plants adapt to this P limitation. Here, we examined which strategies would be adopted by plants for alleviating P deficiency caused by N enrichment from the persp...
Article
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Measuring the nitrogen isotope compositions (δ15N) of nitric oxide (NO) from different sources helps to quantify the relative contributions of atmospheric NOx. Soil is one of the most important sources of atmospheric NOx, but only limited measurements on the δ15N of soil emitted NO exist, hampering our ability to partition sources to air pollution....
Preprint
Full-text available
Nitrogen use efficiency (NUE) has been widely used in cropping systems to study nitrogen (N) cycles and inform N management on various spatial scales, from a single plant to the globe. Although the number of NUE studies is growing, interpretation of results is unfortunately hindered by widely differing definitions and quantification methods among s...
Article
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Abstract In the past several decades, the development of nitrogen (N) stable isotope techniques has improved the understanding of N cycling in terrestrial ecosystems. This review briefly introduced the history of N stable isotope techniques in studying N cycling in terrestrial ecosystems and summarized typical studies focusing on different aspect...
Article
Dissimilarity nitrate reduction to ammonium (DNRA) is of significance in agriculture ecosystems as the process is beneficial to N retention in soils. However, how fertilization regimes influence DNRA rates and functional microbes in agriculture was rarely estimated. In the present study, a 2-year pot experiment was conducted in two contrasting padd...
Article
While China’s Air Pollution Prevention and Control Action Plan on particulate matter since 2013 has reduced sulfate significantly, aerosol ammonium nitrate remains high in East China. As the high nitrate abundances are strongly linked with ammonia, reducing ammonia emissions is becoming increasingly important to improve the air quality of China. Al...
Article
Ammonia (NH3) is an important precursor of fine particles and nitrogen deposition. It is critical to identify and quantify the sources of NH3 before the implementation of a mitigation strategy. Stable isotope analysis in R (SIAR) has potential with regard to the source apportionment of NH3, but its reliability is closely related to the signatures (...
Article
Full-text available
The ecosystem carbon (C) balance in permafrost regions, which has a global significance in understanding the terrestrial C-climate feedback, is significantly regulated by nitrogen (N) dynamics. However, our knowledge on temporal changes in vegetation N limitation (i.e., the supply of N relative to plant N demand) in permafrost ecosystems is still l...
Article
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Nitrogen oxide (NO x ) abatement has become the focus of air quality management strategies. In this study, we examined NO x sources and the atmospheric conversion of NO x in Karachi, Pakistan, a megacity in South Asia with serious particulate pollution problems. Oceanic contributions to NO x were quantified for the first time based on a novel appro...
Article
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The stable isotopes of nitrogen in nitrate archived in polar ice have been interpreted as reflecting a shift in reactive nitrogen sources or changes in atmospheric chemical reactivity. Here, we present a novel concentration and isotopic record of nitrate (δ¹⁵N-NO3⁻) from a central Tibetan Plateau ice core over the last ~200 years. We find that nitr...
Article
Sewage treatment is one of the important sources of nitrous oxide (N2O) production, understanding its microbial process is fundamental for reducing N2O emissions. In this study, the stable isotope tracer method was used to reveal the contribution of co-denitrification to the release of N2O in addition to nitrification and denitrification in subsurf...