Shuli Niu

Shuli Niu
Institute of Geographic Science and Natural Resources Research · Chinese Academy of Sciences

PhD

About

285
Publications
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10,815
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Publications

Publications (285)
Article
Full-text available
Soil microbes play a crucial role in myriad ecological processes in terrestrial ecosystem. With increasing nitrogen (N) loading, phosphorus (P) may become more limiting for soil microbes and these processes. However, it remains unclear to what extent P addition impacts soil microbial communities and respiration at global scale, especially under dif...
Article
Continuously increasing nitrogen (N) deposition alters soil N mineralization, which is of vital importance in regulating soil N availability and satisfying plant N demands. Neither the response pattern of soil N mineralization to the chronic N enrichment nor the related mechanism has been well studied, particularly in deep soils. In this study, we...
Article
Respiratory effluxes of carbon (C) from the soil to the atmosphere are expected to rise with temperature, potentially intensifying future climate warming. However, whether and how this increase would be sustained under long-term warming is not well understood. Here, we combined a manipulation experiment in an alpine meadow with a global meta-analysi...
Article
Full-text available
With the rapid accumulation of plant trait data, major opportunities have arisen for the integration of these data into predicting ecosystem primary productivity across a range of spatial extents. Traditionally, traits have been used to explain physiological productivity at cell, organ, or plant scales, but scaling up to the ecosystem scale has rem...
Article
Plant and microbial diversity are key to determine ecosystem functioning. Despite the well‐known role of local‐scale α diversity in affecting vegetation biomass, it still remains unclear about the effects of community heterogeneity (β diversity) of plants and soil microbes on above‐ and belowground biomass (AGB and BGB) across contrasting environme...
Article
Revealing how heterotrophic respiration (Rh) and its contribution to soil respiration (Rs, Rh/Rs ratio) respond to climate warming and land-use change is crucial for advancing our understanding of the feedback between the terrestrial carbon (C) cycle and future climate changes. Here we conducted a 7-year manipulation experiment by warming and clipp...
Article
Temperature response of gross primary productivity (GPP) is a well-known property of ecosystem, but GPP at the optimum temperature (GPP_Topt) has not been fully discussed. Our understanding of how GPP_Topt responds to warming and water availability is highly limited. In this study, we analyzed data at 326 globally distributed eddy covariance sites...
Preprint
Soil inorganic carbon (SIC) pool is a major component of soil C pools, and clarifying the predictors of SIC stock is urgent for decreasing soil C losses and maintaining soil health and ecosystem functions. However, the drivers and their relative effects on the SIC stock at different soil depths remain largely unexplored. Here, we conducted a large-...
Article
1. Soil enzymes are central to ecosystem processes because they mediate numerous reactions that are essential in biogeochemical cycles. However, how soil enzyme activities will respond to global warming is uncertain. We reviewed the literature on mechanisms linking temperature effects on soil enzymes and microbial communities, and outlined a concep...
Article
Full-text available
Nitrogen (N) deposition significantly lessens ecosystem N limitation, and can even cause N saturation and soil acidification. The effects of N enrichment have been globally assessed for plants, microbial diversity and biomass. However, at higher trophic levels, the global patterns and controlling factors of soil nematodes fed by plants or microbes...
Article
Mounting evidence has indicated that forest thinning would increase soil respiration (SR) in the early stage (c. < 5 years) after thinning. However, the responses of SR and its components to different thinning intensities in the long-term have not been sufficiently studied. In April 2010, four levels of thinning intensities including control (CK, n...
Article
Full-text available
Droughts significantly impact land carbon uptake by reducing the gross primary productivity (GPP). Projections suggest an increase in severe and extreme droughts in the twenty‐first century. Despite the importance of droughts on carbon uptakes, it remains unclear about the GPP responses under different drought severity and its changes under current...
Article
Full-text available
The alpine meadow is one of the most important ecosystems on the Qinghai-Tibet Plateau (QTP) due to its huge carbon storage and wide distribution. Evaluating the carbon fluxes in alpine meadow ecosystems is crucial to understand the dynamics of carbon storage in high-altitude areas. Here, we investigated the carbon fluxes at seasonal and inter-annu...
Article
Epiphytic microbes on the surfaces of leaves and roots can bring substantial benefits or damages to their plant hosts. Although various factors have been proposed for shaping the epiphytic microbial composition, the contributions of environment factors, endogenous microbial taxa interactions, host plant traits, and their interactive effects are poo...
Article
Full-text available
Understanding the dynamics of peatland methane (CH4) emissions and quantifying sources of uncertainty in estimating peatland CH4 emissions are critical for mitigating climate change. The relative contributions of CH4 emission pathways through ebullition, plant-mediated transport, and diffusion, together with their different transport rates and vuln...
Article
Full-text available
Prediction of carbon (C) sequestration in terrestrial ecosystems under climate change depends on C‐nitrogen (N) interactions. While many newly developed C‐N coupling models predict lower C storage than their C‐only counterpart models, it has not been carefully examined whether or not such model predictions would be supported by real‐world observati...
Article
The precise estimation of global nitrous oxide (N2O) emissions in nitrogen cycling will facilitate improved projections of future climate change. However, the geographical variations and the primary controlling factors of N2O emissions remain elusive at the global scale. What is lacking is their specific evaluation based on field data. We compiled...
Article
Biodiversity and productivity that highly determine ecosystem services are varying largely under global change. However, the climate sensitivity of them and their relationship are not well understood, especially in the context of increasing nitrogen (N) deposition. Here, based on a six-year N manipulation experiment in an alpine meadow, we quantifi...
Chapter
Soil carbon (C) balance is a key component of the terrestrial C cycling because soil capsules an enormous amount of organic C. With global warming, acceleration of soil C decomposition is highly expected, which increase the risk of triggering positive feedback between soil C release and climate change. Nevertheless, great uncertainty remains on the...
Article
Full-text available
Belowground plant traits play important roles in plant diversity loss driven by atmospheric nitrogen (N) deposition. However, the way N enrichment shapes plant microhabitats by patterning belowground traits and finally determines aboveground responses is poorly understood. Here, we investigated the rhizosheath trait of 74 plant species in seven N‐a...
Article
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This ERL focus collection has published 17 papers that have advanced our understanding of different dimensions of warming-induced tree mortality. Here we summarize these focus collection papers, organized by four topics related to tree mortality: pathogens, droughts/heat waves, fire/bark beetles, and teleconnections/air pollution. This focus collec...
Article
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Enhancing the terrestrial ecosystem carbon sink (referred to as terrestrial C sink) is an important way to slow down the continuous increase in atmospheric carbon dioxide (CO2) concentration and to achieve carbon neutrality target. To better understand the characteristics of terrestrial C sinks and their contribution to carbon neutrality, this revi...
Article
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Pronounced non‐growing season warming and changes in soil freeze‐thaw (F‐T) cycles can dramatically alter net methane (CH4) exchange rates between soils and the atmosphere. However, the magnitudes and drivers of warming impacts on CH4 uptake in different stages of the F‐T cycle are poorly understood in cold alpine ecosystems, which have been found...
Article
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Ecological restoration is essential to reverse land degradation worldwide. Most studies have assessed the restoration of ecosystem functions individually, as opposed to a holistic view. Here we developed a network‐based ecosystem multifunctionality (EMF) framework to identify key functions in evaluating EMF restoration. Through synthesizing 293 res...
Article
Plant biomass is the basis of our diets and ecosystems, and a promising renewable source of energy and materials. The demand for biomass is increasing, but space limits our capacity to deliver enough biomass to meet food security, bioeconomy, and conservation targets, and climate change threatens productivity further. This Voices asks: which should...
Article
Full-text available
Forest thinning is a common forest management practice and has complex effects on soil organic carbon (SOC). However, the mechanisms underlying SOC and its components (physical fractions and chemical compositions) in response to forest thinning remain poorly understood. Four thinning treatments including control (CK with no thinning), light thinnin...
Article
Nitrification and denitrification driven by microbes are important processes mediating soil N availability and N2O emission. Enhanced N deposition usually stimulates both nitrification and denitrification rates, but whether these stimulation effects are generally persistent or not, and the underlying biological mechanism remain unclear. To clarify...
Article
Understanding gross primary productivity (GPP) response to precipitation (PPT) changes is essential for predicting land carbon uptake under increasing PPT variability and extremes. Previous studies found that ecosystem GPP may have an asymmetric response to PPT changes, leading to the inconsistency of GPP gains in wet years compared to GPP declines...
Article
Full-text available
Abstract Grassland ecosystems provide essential services to society. To maintain ecosystem functions and services of grasslands under changing environments, it is critical to understand how grasslands respond and feedback to climate change. Here, we present results from a long‐term (16 years) warming and clipping (to mimic hay harvesting or grazing...
Article
Full-text available
Soil microbes play a crucial role in myriad ecological processes in terrestrial ecosystem. With increasing nitrogen (N) loading, phosphorus (P) may become more limiting for soil microbes and these processes. However, it remains unclear to what extent P addition impacts soil microbial communities and respiration at global scale, especially under dif...
Article
The denitrification process profoundly affects soil nitrogen (N) availability and generates its byproduct, nitrous oxide, as a potent greenhouse gas. There are large uncertainties in predicting global denitrification because its controlling factors remain elusive. In this study, we compiled 4301 observations of denitrification rates across a variet...
Preprint
Full-text available
Understanding the dynamics of peatland methane (CH4) emissions and quantifying sources of uncertainty in estimating peatland CH4 emissions are critical for mitigating climate change. The relative contributions of CH4 emission pathways through ebullition, plant-mediated transport, and diffusion together with their different transport rates and vulne...
Article
Full-text available
Vegetation greening contributes to gross carbon sequestration by plants and thus plays a vital role in mitigation of global warming. Terrestrial vegetation has a significant greening trend in South Asia (SA); however, it remains elusive how this greening translates to gross primary production (GPP) (proxy of gross carbon uptake by plants at ecosyst...
Article
Full-text available
The response of soil carbon release to global warming is largely determined by the temperature sensitivity of soil respiration, yet how this relationship will be affected by increasing atmospheric nitrogen deposition is unclear. Here, we present a global synthesis of 686 observations from 168 field studies to investigate the relationship between ni...
Article
Full-text available
Background Plant nitrogen use efficiency (NUE) is an important ecological indicator that reflects the capacity of a plant to transform nitrogen into production, which is essential for further elucidating plant growth and terrestrial ecosystem productivity. Although there are a growing number of studies that address NUE changes at local scales, the...
Article
Soil carbon (C) stock and aggregate associated C are controlled by complex interactions among climate, edaphic, plant, and microbial factors. However, the relative contribution of these abiotic and biotic factors to variations in soil aggregate associated C and their effects on soil C stock are rarely evaluated. In this study, we investigated the i...
Article
Aim Biodiversity drives the delivery of multiple ecosystem functions related to carbon and nutrient cycling (ecosystem multifunctionality, EMF), and biodiversity and ecosystem functioning are strongly threatened by intensive grazing in grasslands. However, it remains unclear how biodiversity regulates EMF changes in response to intensive grazing....
Article
Forest thinning is a major forest management practice worldwide and may lead to profound alterations in the fluxes of soil greenhouse gases (GHGs). However, the global patterns and underlying mechanisms of soil GHG fluxes in response to forest thinning remain poorly understood. Here, we conducted a global meta-analysis of 106 studies to assess the...
Article
1. Nitrogen (N), phosphorus (P), and acid deposition are co‐occurring in many ecosystems, likely with complex interactive effects on litter decomposition. 2. Few studies have been conducted to distinguish the interactive effects of these three factors on forest litter decomposition. Thus, we performed a 5‐year litter decomposition experiment with N...
Article
Full-text available
Methane (CH4) emissions from natural landscapes constitute roughly half of global CH4 contributions to the atmosphere, yet large uncertainties remain in the absolute magnitude and the seasonality of emission quantities and drivers. Eddy covariance (EC) measurements of CH4 flux are ideal for constraining ecosystem-scale CH4 emissions due to quasi-co...
Article
Aim Precipitation manipulation experiments have shown diverse terrestrial carbon (C) cycling responses when the ecosystem is subjected to different magnitudes of altered precipitation, various experimental durations or heterogeneity in local climate. However, how these factors combine to affect C cycle responses to changes in precipitation remains...
Article
Interannual variability in precipitation has increased globally as climate warming intensifies. The increased variability impacts both terrestrial plant production and carbon (C) sequestration. However, mechanisms driving these changes are largely unknown. Here, we examined mechanisms underlying the response of aboveground net primary production (A...
Article
Full-text available
Stoichiometry of leaf macronutrients can provide insight into the tradeoffs between leaf structural and metabolic investments. Structural carbon (C) in cell walls is contained in lignin and polysaccharides (cellulose, hemicellulose, and pectins). Much of leaf calcium (Ca) and a fraction of magnesium (Mg) were further bounded with cell wall pectins....
Article
Full-text available
Background: Nitrogen (N) and phosphorus (P) deposition have largely affected soil respiration (Rs) in forest ecosystems. However, few studies have explored how N and P individually or in combination to influence Rs and its components (autotrophic respiration, Ra; heterotrophic respiration, Rh), especially in highly P-limited subtropical forests. To...
Article
Climate change intensifies precipitation fluctuation and increases drought frequency around the globe. Water use efficiency (WUE) has proven to be a crucial metric to quantify the trade-off linking global carbon and water cycles in many aspects of terrestrial ecosystem function. Investigating the response of ecosystem WUE to multiannual precipitati...
Article
Dynamics of fine root biomass (FRB) is fundamental to understanding carbon allocation and storage in forests. However, our understanding of FRB responses and its vertical distribution with respect to atmospheric nitrogen (N) deposition is limited. In this study, we applied five N addition rates (0, 5, 10, 15, and 30 g m⁻² yr⁻¹) to explore effects o...
Article
Ecosystem is a fundamental organizational unit of the biosphere in which biological communities interact with their non-biological environment through energy flows and material cycles. Ecosystem Science is the study of patterns, processes, and services of ecosystems. Since the 1990s, rising concerns regarding global climate change, biodiversity los...
Article
Global warming and land-use change have profound impacts on soil respiration (Rs), with consequent changes in carbon exchange between terrestrial ecosystem and atmosphere and its feedback to climate change. However, it is not clear how soil respiration and its components (heterotrophic respiration, Rh; and autotrophic respiration, Ra) respond to lo...
Article
Full-text available
Global nitrogen (N) deposition generally reduces ecosystem stability. However, less is known about the responses of ecosystem stability and its driving mechanisms under different N addition gradients. We conducted a four-year N addition experiment in an alpine meadow, using six levels of N addition rates (0, 2, 4, 8, 16, 32 g N m-2 year-1) to exami...
Article
Questions The relationships between biodiversity and ecosystem functioning (BEF) vary largely across natural ecosystems, with a unimodal, monotonous linear or no relationship. However, it remains unclear how BEF relationships vary under global change. Given future predicted changes in precipitation and nitrogen (N) deposition, it is crucial to dete...
Article
• Whether and how warming alters functional traits of absorptive plant roots remains to be answered across the globe. Tackling this question is crucial to better understand terrestrial responses to climate change as fine-root traits drive many ecosystem processes. • We carried out a detailed synthesis of fine-root trait responses to experimental w...
Article
Nitrogen immobilization usually leads to nitrogen retention in soil and, thus, influences soil nitrogen supply for plant growth. Understanding soil nitrogen immobilization is important for predicting soil nitrogen cycling under anthropogenic activities and climate changes. However, the global patterns and drivers of soil nitrogen immobilization rem...
Article
Biodiversity drives ecosystem functioning across grassland ecosystems. However, few studies have examined how grazing intensity affects ecosystem multifunctionality (EMF) via its effects on plant diversity and soil microbial diversity in dry grasslands. We conducted a 12-year experiment manipulating sheep grazing intensity in a desert steppe of nor...
Article
Full-text available
Aims Terrestrial ecosystem carbon (C) uptake is remarkably regulated by nitrogen (N) availability in the soil. However, the coupling of C and N cycles, as reflected by C:N ratios in different components, has not been well explored in response to climate change. Methods Here, we applied a data assimilation approach to assimilate 14 data sets collec...
Preprint
Full-text available
Methane (CH4) emissions from natural landscapes constitute roughly half of global CH4 contributions to the atmosphere, yet large uncertainties remain in the absolute magnitude and the seasonality of emission quantities and drivers. Eddy covariance (EC) measurements of CH4 flux are ideal for constraining ecosystem-scale CH4 emissions, including thei...
Article
It is well documented that warming can accelerate greenhouse gas (GHG) emissions, further inducing a positive feedback and reinforcing future climate warming. However, how different kinds of GHGs respond to various warming magnitudes remains largely unclear, especially in the cold regions that are more sensitive to climate warming. Here, we concurr...
Article
Ecosystem stability is essential to its sustainable functions and services to humanity. Although climate warming is projected to vary from 1‐5ºC by the end of 21st century, how the temporal stability of plant community biomass production responds to different warming scenarios remains unclear. To fill this knowledge gap, we conducted a 6‐year field...
Article
Full-text available
Background and aims Responses of grassland carbon (C) cycling to changes in precipitation and land use remain a major uncertainty in model prediction of future climate. It remains even far from clear on how does clipping regulate the response sensitivity of grassland C sequestration to precipitation change. Methods We conducted a manipulative fiel...
Article
Full-text available
Soil nitrogen (N) transformations, which regulate soil N availability, are important for ecosystem productivity and other functions. Nitrogen deposition influences soil N transformations, but it remains unclear how soil N transformations, especially microbial N immobilization, change with different N deposition rates. In this study, we compiled a g...
Article
Methane (CH4) and nitrous oxide (N2O) are two greenhouse gases with much more warming potential than carbon dioxide (CO2). However, there have been less studies on their responses to climate warming and land use practices, such as hay harvest in grasslands. Especially, their fluxes are not well estimated during the nongrowing season. In this study,...
Article
Global nitrogen (N) deposition generally reduces plant biodiversity and changes ecosystem carbon (C) cycle. Light limitation caused by accumulated litter under N enrichment is proposed as a main reason for the decreases of biodiversity and ecosystem C sequestration. However, mechanisms underlying this light limitation effect are not well understood...