Both priming and temperature sensitivity of soil organic matter decomposition depend on microbial biomass – An incubation study

Thiessen, Stefanie; Gleixner, Gerd; Wutzler, Thomas; Reichstein, Markus

doi:10.1016/j.soilbio.2012.10.029

Cited by 202 publications

(123 citation statements)

References 57 publications

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“…Simultaneous measurements of soil C stability and annual Q 10 estimates are needed to help resolve this relationship, and therefore determine how soil respiration is changed as the lability of the new SOM gets closer to that of the older SOM. Further, more recent studies also suggest that specific microbial processes, including growth and priming effects should also be considered to further our understanding of the temperature sensitivity of SOM decomposition [83,84].…”

Section: Temperature Sensitivity Of Old Vs New Som Decompositionmentioning

confidence: 99%

Carbon Inputs from Miscanthus Displace Older Soil Organic Carbon Without Inducing Priming

et al. 2016

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The carbon (C) dynamics of a bioenergy system are key to correctly defining its viability as a sustainable alternative to conventional fossil fuel energy sources. Recent studies have quantified the greenhouse gas mitigation potential of these bioenergy crops, often concluding that C sequestration in soils plays a primary role in offsetting emissions through energy generation. Miscanthus is a particularly promising bioenergy crop and research has shown that soil C stocks can increase by more than 2 t C ha −1 yr −1 . In this study, we use a stable isotope ( 13 C) technique to trace the inputs and outputs from soils below a commercial Miscanthus plantation in Lincolnshire, UK, over the first 7 years of growth after conversion from a conventional arable crop. Results suggest that an unchanging total topsoil (0-30 cm) C stock is caused by Miscanthus additions displacing older soil organic matter. Further, using a comparison between bare soil plots (no new Miscanthus inputs) and undisturbed Miscanthus controls, soil respiration was seen to be unaffected through priming by fresh inputs or rhizosphere. The temperature sensitivity of old soil C was also seen to be very similar with and without the presence of live root biomass. Total soil respiration from control plots was dominated by Miscanthus-derived emissions with autotrophic respiration alone accounting for ∼50 % of CO 2 . Although total soil C stocks did not change significantly over time, the Miscanthus-derived soil C accumulated at a rate of 860 kg C ha −1 yr −1 over the top 30 cm. Ultimately, the results from this study indicate that soil C stocks below Miscanthus plantations do not necessarily increase during the first 7 years.

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Section: Temperature Sensitivity Of Old Vs New Som Decompositionmentioning

confidence: 99%

Carbon Inputs from Miscanthus Displace Older Soil Organic Carbon Without Inducing Priming

et al. 2016

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“…Most notably, the ecosystem C sequestration accumulated over a number of years could be undone by a single severe drought [26,31]. When severe droughts occur, soil microbes struggling for 'food' resources eat into the 'old' soil C accumulated over a number of years in grasslands [32]. Additionally, under future climate scenarios, productivity is predicted to increase in North American grasslands despite rising aridity [33].…”

Section: Drought and Grassland C Cyclingmentioning

confidence: 99%

Drought and Carbon Cycling of Grassland Ecosystems under Global Change: A Review

Lei

Pang

Xing-yong

et al. 2016

Water

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Abstract:In recent years, the increased intensity and duration of droughts have dramatically altered the structure and function of grassland ecosystems, which have been forced to adapt to this change in climate. Combinations of global change drivers such as elevated atmospheric CO 2 concentration, warming, nitrogen (N) deposition, grazing, and land-use change have influenced the impact that droughts have on grassland C cycling. This influence, to some extent, can modify the relationship between droughts and grassland carbon (C) cycling in the multi-factor world. Unfortunately, prior reviews have been primarily anecdotal from the 1930s to the 2010s. We investigated the current state of the study on the interactive impacts of multiple factors under drought scenarios in grassland C cycling and provided scientific advice for dealing with droughts and managing grassland C cycling in a multi-factor world. Currently, adequate information is not available on the interaction between droughts and global change drivers, which would advance our understanding of grassland C cycling responses. It was determined that future experiments and models should specifically test how droughts regulate grassland C cycling under global changes. Previous multi-factor experiments of current and future global change conditions have studied various drought scenarios poorly, including changes in precipitation frequency and amplitude, timing, and interactions with other global change drivers. Multi-factor experiments have contributed to quantifying these potential changes and have provided important information on how water affects ecosystem processes under global change. There is an urgent need to establish a systematic framework that can assess ecosystem dynamic responses to droughts under current and future global change and human activity, with a focus on the combined effects of droughts, global change drivers, and the corresponding hierarchical responses of an ecosystem.

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“…Some studies suggest that the priming effect can increase the sensitivity of SOM decomposition to soil temperature [20][21]. However, other studies have found that the increase of temperature reduced the rhizosphere priming effect [42].…”

Section: Effect Of Soil Moisture On Soil Respirationmentioning

confidence: 99%

“…The temperature sensitivity efficiency is dependent on such environmental variables as water conditions [17], soil physical properties [18], soil nutrients [19], vegetation type [6], and priming effect [20][21]. Under field conditions, soil respiration has no significant linear relationship with soil temperature [14,22] and soil moisture [23].…”

mentioning

confidence: 99%

How a Root-Microbial System Regulates the Response of Soil Respiration to Temperature and Moisture in a Plantation

Song

Tong

Zhang

et al. 2018

Pol. J. Environ. Stud.

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Both priming and temperature sensitivity of soil organic matter decomposition depend on microbial biomass – An incubation study

Cited by 202 publications

References 57 publications

Carbon Inputs from Miscanthus Displace Older Soil Organic Carbon Without Inducing Priming

Carbon Inputs from Miscanthus Displace Older Soil Organic Carbon Without Inducing Priming

Drought and Carbon Cycling of Grassland Ecosystems under Global Change: A Review

How a Root-Microbial System Regulates the Response of Soil Respiration to Temperature and Moisture in a Plantation

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