Soil microbial carbon use efficiency and biomass turnover in a long-term fertilization experiment in a temperate grassland

Spohn, Marie; Pötsch, E. M.; Eichorst, Stephanie A.; Woebken, Dagmar; Wanek, Wolfgang; Richter, Andreas

doi:10.1016/j.soilbio.2016.03.008

Cited by 251 publications

(165 citation statements)

References 48 publications

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“…The microbes in CS, with a lower soil C content, likely had a relatively higher microbial use efficiency of residue C than the GS, which was in agreement with a negative correlation of substrate use efficiency and soil C content observed in an organic topsoil (Takriti et al, 2018). The lower microbial use efficiency of residue C in the higher-C soils in the present study can be confounding effects of soil C and N availability (Spohn et al, 2016). Moreover, the glucose-preincubated soils with increased initial MB size likely had lower residue C use efficiency than the corresponding control soils without preincubation with glucose (Fig.…”

Section: Assimilation Of Residue C Into Microbial Biomass Csupporting

confidence: 86%

Soil Microbial Biomass Size and Nitrogen Availability Regulate the Incorporation of Residue Carbon into Dissolved Organic Pool and Microbial Biomass

Zhu‐Barker

et al. 2019

Soil Science Soc of Amer J

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Microbial biomass (MB) plays a critical role in residue decomposition and soil organic matter (SOM) turnover. We investigated the effects of the initial size of soil MB pool and nitrogen (N) availability on the incorporation of ryegrass residue carbon (C) into microbial biomass C (MBC) and dissolved organic C (DOC). Soils from a row crop system (CS) and an adjacent grass sod (GS) were preincubated with (i.e., increased MB) and without (i.e., unchanged MB) glucose to produce soils with two levels of initial MB size before residue additions. Ammonium sulfate was added to test the effect of N availability. Residue addition increased DOC production in both soils, regardless of initial MB size and N availability, contributing 9 to ∼22% to the total pool. Residue quality was observed to affect the incorporation of residue C into DOC, which depended on soil type and initial MB size. However, the assimilation of residue C into MBC was not affected by the quality of ryegrass residue. Compared with the control (which did not have residue and N additions), a significant increase in SOM‐derived MBC by residue addition was observed in CS without glucose preincubation but not in the glucose preincubated CS and in GS. This indicated that the primed MBC by residue addition depended on initial MB size and soil type. The assimilation of residue C into MB was marginally inhibited by the preincubation with glucose in GS but was promoted in CS. With the addition of extra N, higher ryegrass‐derived MBC was observed in CS with glucose preincubation compared with the corresponding treatments without preincubation, which was not found in GS. These results suggested that residue‐derived MBC was not only regulated by initial MB size and N availability but also was affected by soil management history. However, N addition reduced ryegrass‐derived DOC production in GS without glucose preincubation. Apparently, both soil MB size and N availability largely affected the assimilation and incorporation of residue C in soil labile pools (i.e., DOC and MBC), and the extent of this relationship varied between two agricultural soils. Core Ideas Ryegrass residue addition primed the production of SOM‐derived DOC and MBC. Residue quality affected ryegrass‐derived DOC in crop soils. N addition reduced ryegrass‐derived DOC in grass soils. N addition increased ryegrass‐derived MBC in crop soils. Initial MB and N availability regulated the incorporation of residue C into DOC and MBC.

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Section: Assimilation Of Residue C Into Microbial Biomass Csupporting

confidence: 86%

Soil Microbial Biomass Size and Nitrogen Availability Regulate the Incorporation of Residue Carbon into Dissolved Organic Pool and Microbial Biomass

Zhu‐Barker

et al. 2019

Soil Science Soc of Amer J

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“…Recent technical developments have now made it possible to measure microbial growth directly without adding C or N containing substrates, using 18 O‐DNA labeling, finally allowing for a more rigorous exploration of what limits soil microbial growth in ecosystems under change (Geyer, Dijkstra, Sinsabaugh, & Frey, ; Spohn, Potsch, et al, ). This novel 18 O‐DNA method estimates microbial growth by measuring the synthesis of DNA by the incorporation of 18 O from 18 O‐enriched water into microbial DNA (Spohn, Klaus, Wanek, & Richter, ).…”

Section: Empirical Methods Of Determining Microbial Carbon Limitationmentioning

confidence: 99%

Microbial carbon limitation: The need for integrating microorganisms into our understanding of ecosystem carbon cycling

Soong

Fuchslueger

Marañón-Jiménez

et al. 2020

Global Change Biology

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338

152

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Numerous studies have demonstrated that fertilization with nutrients such as nitrogen, phosphorus, and potassium increases plant productivity in both natural and managed ecosystems, demonstrating that primary productivity is nutrient limited in most terrestrial ecosystems. In contrast, it has been demonstrated that heterotrophic microbial communities in soil are primarily limited by organic carbon or energy. While this concept of contrasting limitations, that is, microbial carbon and plant nutrient limitation, is based on strong evidence that we review in this paper, it is often ignored in discussions of ecosystem response to global environment changes. The plant‐centric perspective has equated plant nutrient limitations with those of whole ecosystems, thereby ignoring the important role of the heterotrophs responsible for soil decomposition in driving ecosystem carbon storage. To truly integrate carbon and nutrient cycles in ecosystem science, we must account for the fact that while plant productivity may be nutrient limited, the secondary productivity by heterotrophic communities is inherently carbon limited. Ecosystem carbon cycling integrates the independent physiological responses of its individual components, as well as tightly coupled exchanges between autotrophs and heterotrophs. To the extent that the interacting autotrophic and heterotrophic processes are controlled by organisms that are limited by nutrient versus carbon accessibility, respectively, we propose that ecosystems by definition cannot be ‘limited’ by nutrients or carbon alone. Here, we outline how models aimed at predicting non‐steady state ecosystem responses over time can benefit from dissecting ecosystems into the organismal components and their inherent limitations to better represent plant–microbe interactions in coupled carbon and nutrient models.

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“…It has also been shown that herbaceous bioenergy crops including miscanthus have higher fine root biomass below the plough depth (0e30 cm) than woody species such as SRC willow (Chimento and Amaducci, 2015). Therefore, C allocated belowground under miscanthus may be less exposed to mineralization as microbial biomass, turnover time and C uptake rates generally decrease with depth (Spohn et al, 2016).…”

Section: Turnover In Soil Respirationmentioning

confidence: 99%

Functional differences in the microbial processing of recent assimilates under two contrasting perennial bioenergy plantations

Elias

Rowe

Pereira

et al. 2017

Soil Biology and Biochemistry

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a b s t r a c tLand use change driven alteration of microbial communities can have implications on belowground C cycling and storage, although our understanding of the interactions between plant C inputs and soil microbes is limited. Using phospholipid fatty acids (PLFA's) we profiled the microbial communities under two contrasting UK perennial bioenergy crops, Short Rotation Coppice (SRC) willow and Miscanthus Giganteus (miscanthus), and used Functional differences in microbial communities were highlighted by contrasting processing of labelled C. SRC willow allocated 44% of total 13 C detected into fungal PLFA relative to 9% under miscanthus and 380% more 13 C was returned to the atmosphere in soil respiration from SRC willow soil compared to miscanthus. Our findings elucidate the roles that bacteria and fungi play in the turnover of recent plant derived C under these two perennial bioenergy crops, and provide important evidence on the impacts of land use change to bioenergy on microbial community composition. Crown

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Soil microbial carbon use efficiency and biomass turnover in a long-term fertilization experiment in a temperate grassland

Cited by 251 publications

References 48 publications

Soil Microbial Biomass Size and Nitrogen Availability Regulate the Incorporation of Residue Carbon into Dissolved Organic Pool and Microbial Biomass

Soil Microbial Biomass Size and Nitrogen Availability Regulate the Incorporation of Residue Carbon into Dissolved Organic Pool and Microbial Biomass

Microbial carbon limitation: The need for integrating microorganisms into our understanding of ecosystem carbon cycling

Functional differences in the microbial processing of recent assimilates under two contrasting perennial bioenergy plantations

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