Non-labile plant C contributes to long-lasting macroaggregation of an Oxisol

Martins, Moisés Rodrigues; Angers, Denis A.; Corá, José Eduardo

doi:10.1016/j.soilbio.2012.11.011

Cited by 15 publications

(17 citation statements)

References 25 publications

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“…These results agree with previous studies in the same experimental area, where grasses increased soil aggregation by increasing the contents of carbon and easily hydrolysable polysaccharides . Indirectly, the addition of larger amounts of polysaccharides and pentoses by grasses, particularly of arabinoses and xyloses, serve as a source of energy for microorganisms that act on soil aggregation (Martins et al, 2012a(Martins et al, , 2013.…”

Section: Second Crops (W)mentioning

confidence: 99%

Soil aggregation according to the dynamics of carbon and nitrogen in soil under different cropping systems

Junior

Corá

Lal

2016

Pesq. agropec. bras.

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-The objective of this work was to evaluate total soil carbon and nitrogen, as well as their contents in particulate and mineral-associated C fractions; to determine C stock and sequestration rates in the soil; and to verify the effect of C and N contents on soil aggregation, using different crop rotations and crop sequences under no-tillage. The study was carried out for nine years in a clayey Oxisol. The treatments consisted of different cropping systems formed by the combination of three summer crops (cropped until March) -corn (Zea mays) monocropping, soybean (Glycine max) monocropping, and soybean/corn rotation -and seven second crops (crop successions). Soil samples were taken at the 0.00-0.10-m layer for physical fractionation of C and N, and to determine soil aggregation by the wet method. Soybean monocropping increased C and N in particulate C fraction, while the crop systems with corn monocropping x pigeon pea (Cajanus cajan), corn monocropping x sun hemp (Crotalaria juncea), and soybean monocropping x corn as a crop succession increased total C in the soil. Greater rates of soil C sequestration were observed with soybean/corn rotation and with soybean monocropping, as well as with sun hemp as a second crop. The increase in total N increases soil C stock. Soil aggregation was most affected at particulate C fraction. Increases in soil N promote C addition to particulate fraction and enhance soil aggregation.

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Section: Second Crops (W)mentioning

confidence: 99%

Soil aggregation according to the dynamics of carbon and nitrogen in soil under different cropping systems

Junior

Corá

Lal

2016

Pesq. agropec. bras.

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“…Soil organic matter (SOM) and soil structure are in the mutual dynamic interaction and this relationship is influenced not only by soil properties (Martins et al 2013;Wang et al 2016), but also by the way of land use (Barreto et al 2009;Wang et al 2014). The positive influence of stabile components of SOM (like humus substances) on the quality of soil and soil aggregates is evident (Bartlová et al 2015).…”

mentioning

confidence: 99%

Labile forms of carbon and soil aggregates

Tobiašová¹,

Barančíková²,

Gömöryová³

et al. 2016

Soil & Water Res.

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Tobiašová E., Barančíková G., Gömöryová E., Makovníková J., Skalský R., Halas J., Koco Š., Tarasovičová Z., Takáč J., Špaňo M. Soil organic matter (SOM) plays an important role in the soil aggregation and vice versa, its incorporation into the soil aggregates is one of the mechanisms of soil organic carbon stabilization. In this study the influence of labile carbon fractions on the fractions of dry-sieved (DSA) and wet-sieved (WSA) macro-aggregates and the relationship between the content of total organic carbon (TOC) and its labile fractions in the soil and in the fractions of macro-aggregates were determined. The experiment included six soil types (Eutric Fluvisol, Mollic Fluvisol, Haplic Chernozem, Haplic Luvisol, Eutric Cambisol, Rendzic Leptosol) in four ecosystems (forest, meadow, urban, and agro-ecosystem). In the case of DSA, the contents of labile fractions of carbon, in particular cold water extractable organic carbon (CWEOC) and hot water extractable organic carbon (HWEOC), had a higher impact on the proportions of larger fractions of macro-aggregates (3-7 mm), while in the case of WSA, the impact of labile fractions of carbon, mainly labile carbon (C L ) oxidizable with KMnO 4 , was higher on the proportions of smaller fractions of aggregates (0.25-1 mm). The WSA size fraction of 0.5-1 mm seems an important indicator of changes in the ecosystems and its amounts were in a negative correlation with C L (r = -0.317; P < 0.05) and HWEOC (r = -0.356; P < 0.05). In the WSA and DSA size fractions 0.5-1 mm, the highest variability in the contents of TOC and C L was recorded in the forest ecosystem > meadow ecosystem > urban ecosystem > agro-ecosystem. The higher were the inputs of organic substances into the soil, the greater was the variability in their incorporation into the soil aggregates. The influence of the content of TOC and its labile forms on their contents in the DSA and WSA was different, and the contents of TOC and C L in the aggregates were more significantly affected by the C L content than by water soluble carbon. In the case of WSA fractions, their carbon content was more affected in the 1-2 mm than in 0.5-1 mm fraction.

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“…Type-B plant material is more favorable to SOC accumulation, whereas type-K stimulates the persistence of WSMA. In our microcosm experiments, the model plant for type-B material was pigeon pea, a legume characterized by high lignin and N contents, and the model for type-K material was mature corn residues (Martins et al, 2013). As a grass, mature corn tissues present a hemicellulose fraction containing high levels of pentoses present as arabinoxylans (Schädel et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…1). This equation has two parameters describing two different plant material organic pools: the mineralization rate of the labile C pool (parameter b), followed by the mineralization rate of the non-labile C pool (parameter k) (Martins et al, 2013). We propose that there are two contrasting types of plant materials that would have differential positive effects on SOC and soil WSMA: type-B and type-K plant materials.…”

Section: Modelmentioning

confidence: 99%