Nitrogen mineralization, not N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; fixation, alleviates progressive nitrogen limitation – Comment on “Processes regulating progressive nitrogen limitation under elevated carbon dioxide: a meta-analysis” by Liang et al. (2016)

Rütting, Tobias

doi:10.5194/bg-14-751-2017

Cited by 10 publications

(6 citation statements)

References 22 publications

(35 reference statements)

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“…However, ecosystems may respond to global change by feedbacks that increase N availability, hence maintaining C uptake as CO 2 concentrations increase. Such mechanisms include increased N 2 fixation (Hu et al 2006), mining for mineral N in deeper soil layers (Iversen et al 2011) and increasing mineralizationimmobilization turnover (Rütting and Andresen 2015;Rütting 2017). Moreover, responses of the N cycle in terrestrial ecosystems to climate change might differ depending on whether the ecosystem is limited by N or phosphorus (P) (Dijkstra et al 2013;Rütting and Andresen 2015).…”

Section: Introductionmentioning

confidence: 99%

Soil nitrogen cycle unresponsive to decadal long climate change in a Tasmanian grassland

Rütting

Hovenden

2019

Biogeochemistry

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Increases in atmospheric carbon dioxide (CO 2) and global air temperature affect all terrestrial ecosystems and often lead to enhanced ecosystem productivity, which in turn dampens the rise in atmospheric CO 2 by removing CO 2 from the atmosphere. As most terrestrial ecosystems are limited in their productivity by the availability of nitrogen (N), there is concern about the persistence of this terrestrial carbon sink, as these ecosystems might develop a progressive N limitation (PNL). An increase in the gross soil N turnover may alleviate PNL, as more mineral N is made available for plant uptake. So far, climate change experiments have mainly manipulated one climatic factor only, but there is evidence that single-factor experiments usually overestimate the effects of climate change on terrestrial ecosystems. In this study, we investigated how simultaneous, decadal-long increases in CO 2 and temperature affect the soil gross N dynamics in a native Tasmanian grassland under C3 and C4 vegetation. Our laboratory 15 N labeling experiment showed that average gross N mineralization ranged from 4.9 to 11.3 lg N g-1 day-1 across the treatment combinations, while gross nitrification was about ten-times lower. Considering all treatment combinations, no significant effect of climatic treatments or vegetation type (C3 versus C4 grasses) on soil N cycling was observed.

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Section: Introductionmentioning

confidence: 99%

Soil nitrogen cycle unresponsive to decadal long climate change in a Tasmanian grassland

Rütting

Hovenden

2019

Biogeochemistry

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“…If not on mineral N fertilizer, N cycling microorganisms have to rely on native N sources, which originate mainly from soil organic matter (SOM) decomposition and, to a lesser extent, from biological N 2 fixation ( Rütting , ). Organic N compounds can directly be utilized in dissimilatory microbial processes such as co‐denitrification and heterotrophic nitrification, which can be important N 2 O sources ( Spott and Stange , ; Zhang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Primed N₂O emission from native soil nitrogen: A ¹⁵N‐tracing laboratory experiment

Schleusner

Lammirato

Tierling

et al. 2018

J. Plant Nutr. Soil Sci.

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Soils can naturally be a source of the potent greenhouse gas nitrous oxide (N 2 O). By contrast, the largest anthropogenic source of N 2 O is the application of nitrogen (N) fertilizer on agricultural soil, but it is unclear if fertilizer-supported N 2 O emission only originates from the fertilizer N directly or through additionally stimulated N 2 O production from native soil N. Even though native soil N also includes mineral N already in soil before fertilizer application, organic N is the principal native N pool and thereby provides for mineral N cycling and N 2 O emission. Here, we tested (1) the contribution of native soil N to N 2 O emission after mineral N fertilizer application and (2) whether it is affected by different soil organic matter (SOM) contents by conducting a laboratory 15 N-tracing experiment with agricultural soil from a long-term field trial with two treatments. Both field treatments are fertilized with mineral N, whereas only one of the two receives liquid manure causing higher SOM content. Soil sampling was conducted in March 2016 shortly before fertilizer application in the field. The application of 15 N-labeled fertilizer more than doubled the N 2 O production from native N sources compared to the non-fertilized control incubations. This primed N 2 O production contributed by 5-8% to the fertilizer-induced N 2 O emission after one week of incubation and was similar for both field treatments regardless of liquid manure application. Therefore, further research is needed to link N 2 O priming to its potential production pathways and sources. While the observed effect may be important in soils, the amount of applied N fertilizer remains the largest concern being responsible for the majority of N 2 O emission.

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“…While it seems reasonable that PNL would happen in the medium term (Liang et al, 2016), reviewed several FACE experiments, and found PNL could be alleviated with higher N fixation and less leaching. However, Rütting (2017) suggested that N fixation is only a special case of PNL alleviation and that other mechanisms, such as increased N mineralization, could also compensate for ecosystem N losses. Both authors suggest the need for further studies to obtain more clarity on the effect of PNL on CEF.…”

Section: Discussionmentioning

confidence: 99%

“…While it seems reasonable that PNL would happen in the medium term (Liang et al, 2016), reviewed several FACE experiments, and found PNL could be alleviated with higher N fixation and less leaching. However, Rütting (2017) experiments suggests that nutrient limitations modulate the CFE response, and found that the type of mycorrhizae was the most important variable in modulating the CO 2 response and the biomass production aboveground.…”

Section: Limiting Growth Factors and Uncertaintiesmentioning

confidence: 99%

Effects of climate change on forest plantation productivity in Chile

Carrasco¹,

Almeida

Falvey

et al. 2022

Global Change Biology

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Forest plantation productivity is influenced by the climate, soil, species physiology and genetics, length of rotation, and applied management practices (Zhou et al., 2017). Native and planted forests have an important role sequestering CO 2 from the atmosphere and storing it in carbon pools (Sedjo & Sohngen, 2012). Results found over the past four decades from several free air CO 2 enrichment (FACE) experiments show that overall there is an increase in tree biomass production by increasing atmospheric CO 2 concentration

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Nitrogen mineralization, not N<sub>2</sub> fixation, alleviates progressive nitrogen limitation – Comment on “Processes regulating progressive nitrogen limitation under elevated carbon dioxide: a meta-analysis” by Liang et al. (2016)

Cited by 10 publications

References 22 publications

Soil nitrogen cycle unresponsive to decadal long climate change in a Tasmanian grassland

Soil nitrogen cycle unresponsive to decadal long climate change in a Tasmanian grassland

Primed N₂O emission from native soil nitrogen: A ¹⁵N‐tracing laboratory experiment

Effects of climate change on forest plantation productivity in Chile

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Nitrogen mineralization, not N&lt;sub&gt;2&lt;/sub&gt; fixation, alleviates progressive nitrogen limitation – Comment on “Processes regulating progressive nitrogen limitation under elevated carbon dioxide: a meta-analysis” by Liang et al. (2016)

Cited by 10 publications

References 22 publications

Soil nitrogen cycle unresponsive to decadal long climate change in a Tasmanian grassland

Soil nitrogen cycle unresponsive to decadal long climate change in a Tasmanian grassland

Primed N2O emission from native soil nitrogen: A 15N‐tracing laboratory experiment

Effects of climate change on forest plantation productivity in Chile

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Nitrogen mineralization, not N<sub>2</sub> fixation, alleviates progressive nitrogen limitation – Comment on “Processes regulating progressive nitrogen limitation under elevated carbon dioxide: a meta-analysis” by Liang et al. (2016)

Primed N₂O emission from native soil nitrogen: A ¹⁵N‐tracing laboratory experiment