Pyrogenic carbon additions to soil counteract positive priming of soil carbon mineralization by plants

Whitman, Thea; Enders, Akio; Lehmann, Johannes

doi:10.1016/j.soilbio.2014.02.009

Cited by 94 publications

(84 citation statements)

References 53 publications

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“…There have been some recent studies on the assessment of the (i) priming effects of biochar on native SOC mineralisation (Luo et al, 2011;Zimmerman et al, 2011;Singh and Cowie, 2014;Whitman et al, 2014) and (ii) biochar C stability in soil (Hilscher and Knicker, 2011a;Singh et al, 2012;Fang et al, 2014a). To our knowledge, this is the first study that has focussed on improving our understanding of the priming of native SOC mineralisation by biochar under the interactive influence of incubation temperature, soil type and pyrolysis temperature.…”

Section: Discussionmentioning

confidence: 99%

Effect of temperature on biochar priming effects and its stability in soils

Fang

Singh

2015

Soil Biology and Biochemistry

177

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Section: Discussionmentioning

confidence: 99%

Effect of temperature on biochar priming effects and its stability in soils

Fang

Singh

2015

Soil Biology and Biochemistry

177

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“…It may indicate that some portions of materials were respired preferentially by microbes. WEOC contributed the most and could be identified as a good proxy for plant material-derived CO 2 emissions (Whitman et al 2014). As the amount of available C in feedstock was 150 times greater than biomass C (Table 1), it was sufficient to cause Bmicrobial activation ( Blagodatskaya and Kuzyakov 2008).…”

Section: Statisticsmentioning

confidence: 99%

Taxon-specific responses of soil microbial communities to different soil priming effects induced by addition of plant residues and their biochars

Lou

Brookes

et al. 2015

J Soils Sediments

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Purpose This work investigated changes in priming effects and the taxonomy of soil microbial communities after being amended with plant feedstock and its corresponding biochar. Materials and methods A soil incubation was conducted for 180 days to monitor the mineralization and evolution of soilprimed C after addition of maize and its biochar pyrolysed at 450°C. Responses of individual microbial taxa were identified and compared using the next-generation sequencing method. Results and discussion Cumulative CO 2 showed similar trends but different magnitudes in soil supplied with feedstock and its biochar. Feedstock addition resulted in a positive priming effect of 1999 mg C kg −1 soil (+253.7 %) while biochar gave negative primed C of −872.1 mg C kg −1 soil (−254.3 %). Linear relationships between mineralized material and mineralized soil C were detected. Most priming occurred in the first 15 days, indicating co-metabolism. Differences in priming may be explained by differences in properties of plant material, especially the water-extractable organic C. Predominant phyla were affiliated to Acidobacteria, Actinobacteria, C h l o ro f l e x i , G e m m a t i m o n a d e t e s , F i r m i c u t e s , Planctomycetes, Proteobacteria, Verrucomicrobia, Ascomycota, Basidiomycota, Blastocladiomycota, Chytridiomycota, Zygomycota, Euryarchaeota, and Thaumarchaeota during decomposition. Cluster analysis resulted in separate phylogenetic grouping of feedstock and bioc h a r. B a c t e r i a ( A c i d o b a c t e r i a , F i r m i c u t e s , Gemmatimonadetes, Planctomycetes), fungi (Ascomycota), and archaea (Euryarchaeota) were closely correlated to primed soil C (R 2 =−0.98, −0.99, 0.84, 0.81, 0.91, and 0.91, respectively).Conclusions Quality of plant materials (especially labile C) shifted microbial community (specific microbial taxa) responses, resulting in a distinctive priming intensity, giving a better understanding of the functional role of soil microbial community as an important driver of priming effect.

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“…This could partially offset the net C accrual by PyC (Woolf and Lehmann, 2012). Other studies, however, report decreased net mineralization of nSOM, often after an initial increase (Zimmerman et al, 2011;Whitman et al, 2014aWhitman et al, , 2014b. The mechanisms for these divergent results are not yet clear (Whitman et al, 2015).…”

Section: Introductionmentioning

confidence: 96%

“…The mechanisms for these divergent results are not yet clear (Whitman et al, 2015). Moreover, the addition of relatively easily-mineralizable plant residues to PyOM-containing soil may also alter the mineralization rates of PyC, the added residue and existing nSOM (Keith et al, 2011;Whitman et al, 2014a). In agricultural and forest soils, such residues repeatedly enter the soil in the form of root exudates and crop or foliage residues.…”

Section: Introductionmentioning

confidence: 99%