Water availability and abundance of microbial groups are key determinants of greenhouse gas fluxes in a dryland forest ecosystem

Martins, Catarina S. C.; Nazaries, Loïc; Macdonald, Catriona A.; Anderson, Ian C.; Singh, Brajesh K.

doi:10.1016/j.soilbio.2015.03.012

Cited by 62 publications

(37 citation statements)

References 61 publications

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“…This is in line with findings from Martins et al . () demonstrating negligible soil N 2 O emissions from a nearby paddock (<500 m away). Negative relationships between soil moisture and both N and P mineralization rates may have resulted from higher plant and microbial nutrient immobilization under wetter conditions as has been previously reported in Dijkstra et al .…”

Section: Discussionmentioning

confidence: 98%

Elevated carbon dioxide increases soil nitrogen and phosphorus availability in a phosphorus‐limited Eucalyptus woodland

Hasegawa

Macdonald

Power

2016

Global Change Biology

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Free-Air CO 2 Enrichment (FACE) experiments have demonstrated increased plant productivity in response to elevated (e)CO 2 , with the magnitude of responses related to soil nutrient status. Whilst understanding nutrient constraints on productivity responses to eCO 2 is crucial to predicting carbon uptake and storage, very little is known about how eCO 2 affects nutrient cycling in phosphorus (P)-limited ecosystems. Our study investigates eCO 2 effects on soil N and P dynamics at the EucFACE experiment in Western Sydney over an 18 month period. Three ambient and three eCO 2 (+150 ppm) FACE rings were installed in a P-limited, mature Cumberland Plain Eucalyptus woodland. Levels of plant accessible nutrients, evaluated using ion exchange resins, were increased under eCO 2 , compared to ambient, for nitrate (+93%), ammonium (+12%) and phosphate (+54%). There was a strong seasonality to responses, particularly for phosphate, resulting in a relatively greater stimulation in available P, compared to N, under eCO 2 in spring and summer. eCO 2 was also associated with faster nutrient turnover rates in the first six months of the experiment, with higher N (+175%) and P (+211%) mineralisation rates compared to ambient rings, although this difference did not persist. Seasonally-dependant effects of eCO 2 were seen for concentrations of dissolved organic carbon in soil solution (+31%), and there was also a reduction in bulk-soil pH (-0.18 units) observed under eCO 2 . These results demonstrate that CO 2 fertilisation increases nutrient availability -particularly for phosphate -in P-limited soils, likely via increased plant belowground investment in labile carbon and associated enhancement of microbial turnover of organic matter and mobilisation of chemically-bound P. Early evidence suggests that there is the potential for the observed increases in P availability to support increased ecosystem Caccumulation under future predicted CO 2 concentrations.

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Section: Discussionmentioning

confidence: 98%

Elevated carbon dioxide increases soil nitrogen and phosphorus availability in a phosphorus‐limited Eucalyptus woodland

Hasegawa

Macdonald

Power

2016

Global Change Biology

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“…This approach relies on ordinary leastsquares (OLS) linear regression analysis and is considered better than multiple linear regression as it does not rely on null hypothesis testing (Burnham et al, 2011;Mundry, 2011). Instead of performing a stepwise selection of the predictor variables of interest (like with a classical multiple linear regression), this approach uses an 'all subset' analysis during which all possible models are ranked based on their AIC value, with the lowest AIC corresponding to the 'best approximating model' (Burnham and Anderson, 2004;Burnham et al, 2011;Martins et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Shifts in the microbial community structure explain the response of soil respiration to land-use change but not to climate warming

Nazaries

Tottey

Robinson

et al. 2015

Soil Biology and Biochemistry

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“…The nitrification-related pathways (including ammonia oxidation and nitrifier denitrification) regulated by ammonia-oxidizing archaea (AOA) and bacteria (AOB) are also considered to be an important source of dryland N 2 O emissions (Barton et al, 2008;Martins et al, 2015). AOA may substantially contribute to N 2 O formation through the ammonia oxidation pathway either with the intermediate HNO, rather than hydroxylamine used by AOB, as a direct precursor of N 2 O (Walker et al, 2010) or through a novel hybrid formation mechanism combining one N atom from NO or NO 2 2 with another N atom from hydroxylamine, HNO, amines or NH 1 4 in an enzymatic reaction (Stieglmeier et al, 2014).…”

Section: Key Biological Pathways Of N 2 O Emissions In Drylandsmentioning

confidence: 99%

“…The majority of understanding, however, has been gained through studies dominated by temperate and humid ecosystems where water and nutrients are not scarce, with N 2 O production from drylands being documented less frequently. Although severe water and nutrient stresses restrict the net primary productivity and biological activity (Delgado-Baquerizo et al, 2014), emerging studies have reported the wide prevalence of N transformations and N 2 O emissions in arid and semiarid environments (Austin et al, 2004;Barton et al, 2013;Zaady et al, 2013) and particularly in dryland agricultural and forest plantation soils with N fertilization and irrigation (Hu et al, 2015b;Martins et al, 2015). It was found that a constant level of N 2 O fluxes is generally observed during the dry seasons, with considerable increases in the amounts of N 2 O emissions occurring as soon as drylands are wetted following rainfall or irrigation events (Barton et al, 2013).…”

Section: Introduction: Overview Of Nitrous Oxide Emissions From Drylandsmentioning

confidence: 99%

Microbial nitrous oxide emissions in dryland ecosystems: mechanisms, microbiome and mitigation

Trivedi

Singh

2017

Environmental Microbiology

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Globally, drylands represent the largest terrestrial biome and are projected to expand by 23% by the end of this century. Drylands are characterized by extremely low levels of water and nutrients and exhibit highly heterogeneous distribution in plants and biocrusts which make microbial processes shaping the dryland functioning rather unique compared with other terrestrial ecosystems. Nitrous oxide (N O) is a powerful greenhouse gas with ozone depletion potential. Despite of the pivotal influences of microbial communities on the production and consumption of N O, we have limited knowledge of the biological pathways and mechanisms underpinning N O emissions from drylands, which are estimated to account for 30% of total gaseous nitrogen emissions on Earth. In this article, we describe the key microbial players and biological pathways regulating dryland N O emissions, and discuss how these processes will respond to emerging global changes such as climate warming, extreme weather events and nitrogen deposition. We also provide a conceptual framework to precisely manipulate the dryland microbiome to mitigate N O emissions in situ using emerging technologies with great specificity and efficacy. These cross-disciplinary efforts will enable the development of novel and environmental-friendly microbiome-based solutions to future mitigation strategies of climate change.

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Water availability and abundance of microbial groups are key determinants of greenhouse gas fluxes in a dryland forest ecosystem

Cited by 62 publications

References 61 publications

Elevated carbon dioxide increases soil nitrogen and phosphorus availability in a phosphorus‐limited Eucalyptus woodland

Elevated carbon dioxide increases soil nitrogen and phosphorus availability in a phosphorus‐limited Eucalyptus woodland

Shifts in the microbial community structure explain the response of soil respiration to land-use change but not to climate warming

Microbial nitrous oxide emissions in dryland ecosystems: mechanisms, microbiome and mitigation

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