Effect of added nitrogen on plant litter decomposition depends on initial soil carbon and nitrogen stoichiometry

Finn, Damien; Page, Kathryn; Catton, Kerrilyn; Strounina, Ekaterina; Kienzle, Marco; Robertson, Fiona; Armstrong, Roger; Dalal, Ram C.

doi:10.1016/j.soilbio.2015.09.001

Cited by 85 publications

(49 citation statements)

References 60 publications

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“…For example, the initial stage of POM mineralisation is primarily dependent on plant litter chemistry, which can be plant species specific (Bejarano et al, 2014;Finn et al, 2015;Hobbie, 2005;Mathers et al, 2007). This is attributed to the relative abundance of alkyl, N-alkyl, methoxyl and carboxyl C functional groups (associated with labile amino acids, organic acids and lipids) and O-alkyl and di-O-alkyl C functional groups (associated with cellulose, hemicellulose, tannin and lignin) that comprises plant litter.…”

Section: Bioavailability Dependent On Som Chemical Propertiesmentioning

confidence: 99%

“…These variable results are presumably due to CUE and priming system properties, dependent on stoichiometry (including both plant biomass input and SOM) that vary between soils. For example, N fertilisation of low TOC and high C:N ratio soils can lead to priming and SOM loss, whereas N fertilisation of high TOC and low C:N ratio soils can have minimal change in C mineralisation (Finn et al, 2015). By standardising input plant residue ratios of C, N, P and sulphur with inorganic forms in order to match stoichiometric ratios of soil humus (10 000: 833: 200: 143 for C, N, P and sulphur, respectively) Kirkby et al demonstrate significant improvements in humification efficiency in vitro, and thus increases in SOM (Kirkby et al, 2013).…”

Section: Fertilisation Effects On Som Turnovermentioning

confidence: 99%

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Microbial energy and matter transformation in agricultural soils

Finn

Kopittke

Dennis

et al. 2017

Soil Biology and Biochemistry

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a b s t r a c tLow bioavailability of organic carbon (C) and energy are key constraints to microbial biomass and activity. Microbial biomass, biodiversity and activity are all involved in regulating soil ecosystem services such as plant productivity, nutrient cycling and greenhouse gas emissions. A number of agricultural practices, of which tillage and fertiliser application are two examples, can increase the availability of soil organic C (SOC). Such practices often lead to reductions in soil aggregation and increases in SOC loss and greenhouse gas emissions. This review focuses on how the bioavailability of SOC and energy influence the ecology and functioning of microorganisms in agricultural soils. Firstly we consider how management practices affect the bioavailability of SOC and energy at the ecosystem level. Secondly we consider the interaction between SOC bioavailability and ecological principles that shape microbial community composition and function in agricultural systems. Lastly, we discuss and compare several examples of physiological differences that underlie how microbial species respond to C availability and management practices. We present evidence whereby management practices that increase the bioavailability of SOC alter community structure and function to favour microbial species likely to be associated with increased rates of SOC loss compared to natural ecosystems. We argue that efforts to restore stabilised, sequestered SOC stocks and improve ecosystem services in agricultural systems should be directed toward the manipulation of the microbial community composition and function to favour species associated with reduced rates of SOC loss. We conclude with several suggestions regarding where improvements in multi-disciplinary approaches concerning soil microbiology can be made to improve the sustainability of agricultural systems.

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Section: Bioavailability Dependent On Som Chemical Propertiesmentioning

confidence: 99%

Section: Fertilisation Effects On Som Turnovermentioning

confidence: 99%

Microbial energy and matter transformation in agricultural soils

Finn

Kopittke

Dennis

et al. 2017

Soil Biology and Biochemistry

Self Cite

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“…Litter decomposition could also be regulated by changes in soil environmental factors caused by elevated CO 2 and N addition (e.g., acidity, nutrient levels or microbial community) (Carney et al, 2007;Finn et al, 2015;Hasegawa et al, 2015;Liu et al, 2015). However, except for the positive effects of N addition on litter mass remaining via soil effects, no soil effects of elevated CO 2 or its interaction with N were observed in our study (Table 2; Fig.…”

Section: Effects Of Elevated Co 2 N Addition and Population Originmentioning

confidence: 50%

“…In addition, plants from invasive T. sebifera populations have higher rates of mycorrhizal association than plants from native T. sebifera populations which may impact soil physical and chemical properties (Yang et al, 2015). Moreover, litter and soil C:N may interact to determine litter decomposition rates (Finn et al, 2015). Because N deposition will increase soil N availability this may alter soil C:N and hence the composition of litter decomposer communities and litter decomposition rates (Ågren et al, 2013;Finn et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, litter and soil C:N may interact to determine litter decomposition rates (Finn et al, 2015). Because N deposition will increase soil N availability this may alter soil C:N and hence the composition of litter decomposer communities and litter decomposition rates (Ågren et al, 2013;Finn et al, 2015). Therefore, elevated CO 2 and N deposition may alter litter decomposition rates via soil mediated effects that may vary among populations of plants.…”

Section: Introductionmentioning

confidence: 99%

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Interactive effects of elevated CO2 and nitrogen deposition accelerate litter decomposition cycles of invasive tree (Triadica sebifera)

Zhang

Zou

Siemann

2017

Forest Ecology and Management

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a b s t r a c tLitter decomposition is an important component of forest nutrient recycling potentially impacted by elevated CO 2 , nitrogen (N) deposition, and biological invasions. Each can affect decomposition indirectly via changes in litter quantity, litter quality, and soils, which may increase or offset direct effects of elevated CO 2 on decomposition. To date, no study has examined how elevated CO 2 and N deposition interact to determine exotic plant litter cycling or the importance of variation among native and invasive populations of exotic plants for these effects.In this study, we examine elevated CO 2 and N deposition effects on litter production and decomposition of native (China) and invasive (USA) populations of tallow tree (Triadica sebifera). First, we investigated litter production in greenhouse chambers. Then, we conducted three additional experiments using experimentally created litter and soils to examine CO 2 and N effects on litter decomposition via changes in litter quality, soils, and atmospheric environment. Elevated CO 2 and N deposition increased litter production with their combined effects more than additive. Nitrogen deposition increased litter production of native populations more than that of invasive populations. Litter produced in elevated CO 2 had higher C:N and decomposed more slowly than litter produced in ambient CO 2 but N deposition weakened these effects. Decomposition was slower in soils with histories of N deposition or plant association. Elevated CO 2 had no direct effects on litter decomposition.The net effect of elevated CO 2 alone on litter decomposition throughputs was negative for invasive populations due to strong reductions in litter decomposability. The net effect of elevated CO 2 and N deposition together on litter throughputs was positive, especially for native populations due to strong litter production increases.Results suggest that elevated CO 2 and N deposition impact litter cycling primarily through changes in litter quantity and quality with smaller effects via soils. Elevated CO 2 and N deposition had strong positive effects on litter throughputs together due to synergistic positive effects on litter production and offsetting effects on decomposability. Although elevated CO 2 and N deposition had consistent effects on native and invasive populations, the relative magnitudes of their effects on litter quantity and quality impacted litter cycling, suggesting the importance of considering plant trait variation in an overall estimation of global change effects on nutrient dynamics in forests and other ecosystems.

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Long‐term effects of straw mulching coupled with N application on soil organic carbon sequestration and soil aggregation in a winter wheat monoculture system

et al. 2021

Agronomy Journal

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Straw mulching can be affected by N fertilization rate with regard to improving soil organic carbon (SOC) lability, which modifies the net accumulation of SOC and soil aggregation. We conducted a 14-yr field experiment to determine how straw mulching coupled with N application rates affects crop yield, SOC sequestration as a net gain of SOC, and soil aggregation in a winter wheat (Triticum aestivum L.) monoculture system. Six combinations of two cultivation practices, conventional cultivation (CC) and straw mulching (SM), and three N application rates (0, 120, and 240 kg N ha -1 ) were compared. Results revealed that SM did not affect wheat yield throughout the 14 yr of cultivation, but increased the SOC stock, SOC lability, and the carbon management index (CMI) in surface soil (0-20 cm). Instead, N application, N120 and N240, increased the wheat production almost equally, and followed a trend for increasing SOC stock: N240 > N120 > N0; however, a different trend for increasing SOC lability and soil CMI (N120 > N240 > N0). Soil macro-aggregation was increased by SM but decreased with increasing N application. Principal component analysis (PCA) indicated that organic C input was the key to improving SOC sequestration, SOC lability, and soil macro-aggregation rather than N input, especially high N input (N240) reduced SOC lability and soil aggregation in soil. Consequently, medium N application (N120) may be expected to couple with straw directreturning for improving soil productivity and quality in this agro-system.

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Effect of added nitrogen on plant litter decomposition depends on initial soil carbon and nitrogen stoichiometry

Cited by 85 publications

References 60 publications

Microbial energy and matter transformation in agricultural soils

Microbial energy and matter transformation in agricultural soils

Interactive effects of elevated CO2 and nitrogen deposition accelerate litter decomposition cycles of invasive tree (Triadica sebifera)

Long‐term effects of straw mulching coupled with N application on soil organic carbon sequestration and soil aggregation in a winter wheat monoculture system

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