Soil Aggregate Destruction by Ultrasonication Increases Soil Organic Matter Mineralization and Mobility

Mueller, Carsten W.; Schlund, Svetlana; Prietzel, Jörg; Kögel‐Knabner, Ingrid; Gutsch, Martin

doi:10.2136/sssaj2011.0186

Cited by 38 publications

(26 citation statements)

References 47 publications

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“…Our results are in contrast to other sites that showed immediate losses of aggregate-protected C following cultivation of fallow fields into annual crops (Six et al, 1998;Guo and Gifford, 2002;Grandy and Robertson, 2006;Mueller et al, 2012). Our results also are contrary to some that showed decreases in soil C following land use change to occur in light and heavy fractions, whereas increases in soil C due to improved management only increased the light fraction (Tan et al, 2007).…”

Section: Projected Land Use Effects Derived From Rapid Transfer Of Rocontrasting

confidence: 99%

Belowground Carbon Dynamics in Tropical Perennial C4 Grass Agroecosystems

Crow

Deem

Sierra

et al. 2018

Front. Environ. Sci.

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Effective soil management is critical to achieving climate change mitigation in plant-based renewable energy systems, yet limitations exist in our understanding of dynamic belowground responses to the cultivation of energy crops. To better understand the belowground dynamics following cultivation of a grassland in a high-yielding tropical perennial C4 grass in a zero-tillage production system, changes in soil carbon (C) pools were quantified, modeled, and projected and the chemical composition of the aggregate-protected pool was determined in support of the simulated dynamics. Multiple C pools with different ecosystem functions and turnover increased following cultivation: immediately available microbial substrate (measured as hot water-soluble C) and active C (determined through laboratory incubation) increased by 12 and 30% respectively over time and soil C accumulated significantly in multiple physical fractions. A more rapid and dynamic nature of multiple C pools and transfers between pools existed than is often assumed in belowground models used widely in the field to simulate soil C accumulation. Multiple indicators of fresh roots, including the more easily degraded lignin monomers and root-derived long chain substituted fatty acids, appeared in aggregate-protected pools of cultivated soils over time since planting. This rapid transfer of plant inputs through active and intermediate C pools into mineral-dominated pools is the ultimate outcome required for building soil C stocks. Initial model runs suggested that this is evident, even on a 2-year frame, in transfer rates of 0.485 and 0.890 from active to slow and slow to passive pools respectively. The rapid transfer of fresh root-derived input to stable pool suggests that soil C under zero-tillage management may be resilient to disturbances, such as replanting following a kill-harvest, that would otherwise result in losses from unprotected or readily available pools.

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Section: Projected Land Use Effects Derived From Rapid Transfer Of Rocontrasting

confidence: 99%

Belowground Carbon Dynamics in Tropical Perennial C4 Grass Agroecosystems

Crow

Deem

Sierra

et al. 2018

Front. Environ. Sci.

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“…However, Aoyama et al (1999) reported that crushing macroaggregates enhanced C mineralization by 14-35 %. Similar observations were also made by Mueller et al (2012), who reported that the dispersion of aggregates using ultrasonic treatment resulted in an increase in C mineralization by 27 % due to an increase in labile organic carbon. Therefore, the emission rates of GHGs in soil aggregates can be controlled not only by soil properties but also by aggregate stability.…”

supporting

confidence: 87%

Nitrogen addition impacts on the emissions of greenhouse gases depending on the forest type: a case study in Changbai Mountain, Northeast China

et al. 2016

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Purpose Anthropogenic-induced greenhouse gas (GHG) emission rates derived from the soil are influenced by longterm nitrogen (N) deposition and N fertilization. However, our understanding of the interplay between increased N load and GHG emissions among soil aggregates is incomplete. Materials and methods Here, we conducted an incubation experiment to explore the effects of soil aggregate size and N addition on GHG emissions. The soil aggregate samples (0-10 cm) were collected from two 6-year N addition experiment sites with different vegetation types (mixed Korean pine forest vs. broad-leaved forest) in Northeast China. Carbon dioxide (CO 2 ), nitrous oxide (N 2 O), and methane (CH 4 ) production were quantified from the soil samples in the laboratory using gas chromatography with 24-h intervals during the incubation (at 20°C for 168 h with 80 % field water capacity). Results and discussionThe results showed that the GHG emission/uptake rates were significantly higher in the microaggregates than in the macro-aggregates due to the higher concentration of soil bio-chemical properties (DOC, MBC, NO 3 − , NH 4 + , SOC and TN) in smaller aggregates. For the N addition treatments, the emission/uptake rates of GHG decreased after N addition across aggregate sizes especially in mixed Korean pine forest where CO 2 emission was decreased about 30 %. Similar patterns in GHG emission/uptake rates expressed by per soil organic matter basis were observed in response to N addition treatments, indicating that N addition might decrease the decomposability of SOM in mixed Korean pine forest. The global warming potential (GWP) which was mainly contributed by CO 2 emission (>98 %) decreased in mixed Korean pine forest after N addition but no changes in broad-leaved forest. Conclusions These findings suggest that soil aggregate size is an important factor controlling GHG emissions through mediating the content of substrate resources in temperate forest ecosystems. The inhibitory effect of N addition on the GHG emission/uptake rates depends on the forest type.

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“…Based on the molar absorption coefficient ϵ , WSOM from the mofette‐site soil contains less unsaturated and or aromatic C than that extracted by Mueller et al . (), Rennert et al . () and Toosi et al .…”

Section: Resultsmentioning

confidence: 95%

“…However, the average content of aromatic C as determined by 13 C‐NMR spectroscopy in this study (15.4 ± 4.6%) is similar to that determined by Mueller et al . (). Smaller molar absorption in this study relative to extracts from forested soil might be caused by larger amounts of lignin in the SOM of forest soil than in that of grassland soil.…”

Section: Resultsmentioning

confidence: 97%

“…In addition, the variety of extraction procedures will also affect the results. Nevertheless, the amounts of WSOM extracted from the Ah horizons under study clearly exceeded those extracted with K 2 SO 4 from a slightly acid Ap horizon (pH (CaCl 2 ) 5.5; WSOC 61 ± 11 mg kg −1 ; Mueller et al ., ), acid Ah and Ap horizons under different cultivation (pH 4.9–5.5; WSOC 129–180 mg kg −1 ; Toosi et al ., 2012) and a slightly acid forested Ah horizon (pH (CaCl 2 ) 5.9; maximum WSOC 123 mg kg −1 ; Rennert et al ., ). Extraction with more concentrated 0.5 m K 2 SO 4 resulted in similar amounts of WSOC (306 ± 11 and 360 ± 27 mg kg −1 ) with acidic (pH (KCl) 3.5 and 3.6) forested Ah horizons, which were rich in SOC (72.4 and 110.4 g kg −1 ; Badalucco et al ., ).…”

Section: Resultsmentioning

confidence: 99%

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Geogenic CO₂ affects stabilization of soil organic matter

Rennert

Pfanz

2015

European J Soil Science

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The soil on mofette sites is affected by ascending geogenic carbon dioxide (CO 2 ), which partially fills the soil atmosphere. We hypothesized that geogenic CO 2 affects the stabilization of soil organic matter (SOM) at lower partial pressures than had been discussed previously for mofette sites. We studied loamy Ah horizons (n = 22; pH 3.4-4) of the soil along a transect on a grassland mofette site in the northwest Czech Republic with CO 2 partial pressures (p(CO 2 )) of up to 0.52. The samples were fractionated by particle size, density and solubility (water-soluble organic matter (WSOM)), and analysed quantitatively for organic carbon (C) and total nitrogen (N) and qualitatively ( 13 C-NMR spectroscopy). Soil OM with a narrower C:N ratio accumulated in the clay fraction, but at p(CO 2 ) less than approximately 0.1 the proportion of SOM in the clay fraction relative to total SOM tended to decrease with increasing p(CO 2 ), whereas that of particulate organic matter (POM) fractions increased with increasing p(CO 2 ). We attribute the distribution of SOM among the mineral soil and POM to decreased interactions with minerals of the clay fraction. The formation of iron (Fe) hydroxides, which potentially sorb SOM, was not affected negatively by CO 2 . The potential reactivity of Fe hydroxides was even positively affected by increased p(CO 2 ). Export of dissolved SOM into the subsoil might increase at mofette sites because of the large amounts of WSOM and decreasing interactions with minerals of the clay fraction. Therefore, our results show negative effects of CO 2 on SOM stabilization even at moderate p(CO 2 ).

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Soil Aggregate Destruction by Ultrasonication Increases Soil Organic Matter Mineralization and Mobility

Cited by 38 publications

References 47 publications

Belowground Carbon Dynamics in Tropical Perennial C4 Grass Agroecosystems

Belowground Carbon Dynamics in Tropical Perennial C4 Grass Agroecosystems

Nitrogen addition impacts on the emissions of greenhouse gases depending on the forest type: a case study in Changbai Mountain, Northeast China

Geogenic CO₂ affects stabilization of soil organic matter

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Soil Aggregate Destruction by Ultrasonication Increases Soil Organic Matter Mineralization and Mobility

Cited by 38 publications

References 47 publications

Belowground Carbon Dynamics in Tropical Perennial C4 Grass Agroecosystems

Belowground Carbon Dynamics in Tropical Perennial C4 Grass Agroecosystems

Nitrogen addition impacts on the emissions of greenhouse gases depending on the forest type: a case study in Changbai Mountain, Northeast China

Geogenic CO2 affects stabilization of soil organic matter

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Geogenic CO₂ affects stabilization of soil organic matter