Old soil carbon is more temperature sensitive than the young in an agricultural field

Vanhala, Pekka; Karhu, Kristiina; Tuomi, Mikko; Sonninen, Eloni; Jungner, H.; Fritze, Hannu; Liski, Jari

doi:10.1016/j.soilbio.2007.05.022

Cited by 79 publications

(55 citation statements)

References 13 publications

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“…The best fit exponential model explained a large proportion of the variation for measured monthly C4-derived respiration data from bare plots (r 2 = 0.92) and indicated that a 10°C rise in soil temperature would increase CO 2 losses by 342 % (Q 10 = 3.42). The increased temperature sensitivity of recent additions to SOM suggests that for this pool, the lability of its C is less limiting than that of older SOM C [35,74,75]. This has important consequences for the mean residence time (MRT) of C after its sequestration in soils.…”

Section: Temperature Sensitivity Of Old Vs New Som Decompositionmentioning

confidence: 99%

“…It is worth noting that many models assume decomposition of recent C additions is just as sensitive to temperature as decomposition of older SOM [29][30][31]. However, this is not always accurate [32][33][34][35]. Therefore further emphasising the importance of understanding the influence of new crops and their C additions on SOM decomposition.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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“…Due to their low soil content, carbon sources, such as glucose, sucrose and amino acids are usually the limiting factors of microbial activity (Cleveland et al 2002. Under natural conditions, soluble carbon availability results from the decomposition of plant material which is affected by daily and seasonal fluctuations such as temperature and moisture [395][396][397][398][399][400][401][402][403] (Nicolardot et al 1994, Kirschbaum 2006, Vanhala et al 2007, Van Meeteren et al 2007). However, glucose addition to the soil has been utilized as a strategy for measuring the respiratory response of the soil microbial community (Shen and Bartha 1996, Chotte et al 1998, Blagodatskaya et al 2007.…”

Section: Introductionmentioning

confidence: 99%

Soil microbial response to glucose and phosphorus addition under agricultural systems in the Brazilian Cerrado

Ferreira¹,

Santos²,

Corrêa³

2013

An. Acad. Bras. Ciênc.

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Conventional tillage (CT) and no-tillage (NT) management systems alter soil nutrient availability and consequently modify soil microbial response to nutrient additions such as carbon (C) and phosphorus (P). The objective of this study is to evaluate microbial response to the addition of C (glucose) and P (Na 2 HPO 4 .7H 2 O) under CT and NT in the brazilian Cerrado. In response to glucose addition, the NT system yielded higher microbial respiration rates and glucose consumption than the CT system. The best microbial response to C addition was after 0 -12 h incubation in NT and 0 -24 h in CT. The addition of P produced higher demand under CT than NT. After incubation, biochemical indicators such as microbial respiration, glucose consumption, dehydrogenase activity and metabolic yield confirmed the higher glucose demands under NT and higher phosphorus demands under CT. These results demonstrate that C and P addition alter significantly the microbial response, suggesting that soil microorganisms present nutrient differential demands between CT and NT management systems.

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“…Soil temperature controls biological and biochemical processes in the soil which, in turn, affect soil organic matter formation, fertilizer efficiency, seed germination, plant development, plant winter survival, nutrient uptake and decomposition, and disease and insect occurrence (Jacobs et al, 2007;Karhu et al, 2010;Leifeld and Fuhrer, 2005;Vanhala et al, 2007;Verma et al, 2011). In addition, soil temperature behaviour plays an especially important role in crop variety selection and farm management practices (Azadegan and Massah, 2011;Hartley et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Relation between soil temperature and biophysical parameters in Indian mustard seeds

Adak¹,

Chakravarty²

2013

International Agrophysics

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Temporal changes in surface soil temperature were studied in winter crop. Significant changes in bare and cropped soil temperature were revealed. Air temperature showed a statistically positive and strong relationship (R2 = 0.79** to 0.92**) with the soil temperature both at morning and afternoon hours. Linear regression analysis indicated that each unit increase in ambient temperature would lead to increase in minimum and maximum soil temperatures by 1.04 and 1.02 degree, respectively. Statistically positive correlation was revealed among biophysical variables with the cumulative surface soil temperature. Linear and non-linear regression analysis indicated 62-69, 72-86 and 72-80% variation in Leaf area index, dry matter production and heat use efficiency in Indian mustard crop as a function of soil degree days. Below 60% variation in yield in Indian mustard was revealed as a function of soil temperature. In contrast, non-significant relationship between oil content and soil temperature was found, which suggests that oil accumulation in oilseed crops was not affected significantly by the soil temperature as an independent variable.

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Old soil carbon is more temperature sensitive than the young in an agricultural field

Cited by 79 publications

References 13 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

Soil microbial response to glucose and phosphorus addition under agricultural systems in the Brazilian Cerrado

Relation between soil temperature and biophysical parameters in Indian mustard seeds

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