Molecular characterization of soil organic matter and its extractable humic fraction from long-term field experiments under different cropping systems

Savarese, Claudia; Δρόσος, Μάριος; Spaccini, Riccardo; Cozzolino, Vincenza; Piccolo, Alessandro

doi:10.1016/j.geoderma.2020.114700

Cited by 28 publications

(15 citation statements)

References 63 publications

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“…This results showed that higher alkyl C proportion and lower carboxylic C proportion of HA than that of FA in different particle-size fractions (Table 2 ), the reason may attribute to that HA were higher in molecular weight and contain less oxygen-containing functional groups when compared with FA 29 . In the previous study, the results indicated that ARO% of HA were two or three times higher than that of FA 30 , in the present study, the relatively higher ARO% of HA in 200–50 μm particle-size fraction and the relatively lower ARO% of HA in the other particle-size fractions when compared with FA, which probably due to that chemical structure of different humus component might depend on the heterogeneous environment that formed in different particle-size fractions 7 .…”

Section: Discussionsupporting

confidence: 56%

“…Particle-size fractionation, which allows for the separation of SOM pool with changing degrees of microbial alteration and mineral association, might help elucidate microbial-mediated soil C cycling characteristic 4 , 5 . In the previous studies, these results indicated that SOM were mostly derived from the decomposition of animal and plant litter, soil humus component were main affected by environmental change, such as soil type 6 , crop system 7 , fertilizer regime 8 and so on. Soil humus is a complex organic matter, which the animal and crop residue were synthesized by soil microbial decomposition and transformation.…”

Section: Introductionmentioning

confidence: 88%

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Effects of fertilizer practice on fungal and actinobacterial cellulolytic community with different humified particle-size fractions in double-cropping field

Tang

et al. 2021

Sci Rep

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Cellulose plays an important role in maintaining or improving soil carbon (C) cycling and soil fertility of paddy field. There had close relationship between functional cellulose genes (cbhI and GH48) with characterize of soil organic matter chemical components (fulvic acid and humic acid) and soil physical fractions. However, there is still limited information about how functional cellulose degradation response to long-term fertilizer management and their relative importance for C sequestration under the double-cropping rice paddy field in southern of China. Therefore, the objective of this study were investigated the effects of 34-years long-term fertilizer regime on community abundance of cbhI and GH48 genes in five soil particle-size fractions (> 2000 μm, 2000–200 μm, 200–50 μm, 50–2 μm and 2–0.1 μm) by using polarization magic angle spinning 13C nuclear magnetic resonance spectroscopy. The field experiment was included four different fertilizer treatments: chemical fertilizer alone (MF), rice straw and chemical fertilizer (RF), 30% organic manure and 70% chemical fertilizer (OM), and without fertilizer input as a control (CK). The results showed that distribution of soil humus and cellulolytic microbial community abundance was significant increased under long-term application of crop residue and organic manure condition. And the FA, HA and HM C contents in > 2000 μm and 2000–50 μm fractions with MF, RF and OM treatments were significant higher than that of CK treatment. Meanwhile, the alkyl C and Oalkyl C groups of FA and HA in > 2000 μm fraction with MF, RF, OM and CK treatments were higher than that of the other fractions. There had higher AL% and lower ARO% of FA and HA in different particle-size fractions with MF, RF, OM and CK treatments. The results indicated that abundance of cbhI and GH48 genes in different particle-size fractions with RF and OM treatments were significant increased, compared with CK treatment. There had significant positive correlation between soil humus C components (FA and HA) with abundance of cbhI and GH48 genes, and the o-alkyl C and AL% of FA were positively correlated with abundance of cbhI and GH48 genes. As a result, the community abundance of cbhI and GH48 genes were significant increased under combined application of crop residue and organic manure with chemical fertilizer condition.

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Section: Discussionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 88%

Effects of fertilizer practice on fungal and actinobacterial cellulolytic community with different humified particle-size fractions in double-cropping field

Tang

et al. 2021

Sci Rep

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“…Moreover, the oxidation state of SOM, a measure of vulnerability, is also fundamental for soil functions (Hockaday et al, 2009). As is known, the quality of organic matter inputs including plant residues and manure (Kögel-Knabner, 2002;Savarese et al, 2021), microbial metabolism (catabolism and anabolism) and organo-mineral interactions in the soil matrix (Kopittke et al, 2020;Liang et al, 2017;Sokol & Bradford, 2019) all shape the chemical composition and oxidation state of SOM (Dobarco et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Particle size primarily shifts chemical composition of organic matter under long‐term fertilization in paddy soil

Yan

Zhang

Liu

et al. 2021

European J Soil Science

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The chemistry of soil organic matter (SOM) is critical for soil functions. However, the chemical composition and oxidation state of physical SOM fractions under long-term mineral and organic amendments in paddy soils are still unclear. Here, we investigated this issue using three particle size classes of SOM sampled from five long-term (37-years) fertilisation regimes in a subtropical paddy soil which were analysed using pyrolysis-gas chromatography-mass spectrometry (Py-GC/ MS). Coarse particulate organic matter (cPOM, >250 μm), fine particulate organic matter (fPOM, 53-250 μm) and mineral-associated organic matter (MOM, <53 μm) were isolated. The five fertilisation regimes were (1) unfertilised (control),(2) nitrogen (N, urea), (3) nitrogen + phosphorus + potassium (NPK, urea + Ca (H 2 PO 4 ) 2 + KCl), ( 4) NPK + straw (NPKS) and ( 5) NPK + Astragalus sinicus L. + pig manure (NPKM). After 37-years, the SOM content of the control, N, NPK, NPKS and NPKM treatments had increased by 16.3%, 12.3%, 31.6%, 41.7% and 59.8% compared with the initial level, respectively. The pools of soil organic carbon (SOC) and total N (TN), as well as the C/N ratio in the soil matrix, were localised by particle size, with the majority in the mineral-associated organic matter (MOM). Particle size, not fertilisation regime, primarily associated with shifts

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“…The temporal period of each management on each C functional group and the A/O and A/Aroma ratios by fertilizations were not significantly different (see Table S 2 in the supplemental material); therefore, all data were used for further analysis. Although some recent studies showed that SOM fractions such as humic acids could be a good soil quality indicator representing SOM (e.g., Audette et al 2021 ; Danchenko et al 2020 ; Novotny et al 2020 ; Savarese et al 2021 ), significant differences between soil samples and SOM fractions were observed for alkyl groups and the ratio of A/O (see Table S 3 in the supplemental materials); therefore, only the data from the studies that analyzed bulk soil samples (i.e., 227 pairwise data from 10 studies) were used for the further analysis.…”

Section: Fertilizationmentioning

confidence: 99%

“…The mechanism explaining this effect is that crop rotations not only stimulate a diverse microbial community and rhizodeposits but also provide a higher amount of labile C consisting of O-alkyl C structures as plant biomass relative to a continuous monoculture (Arshad et al 2011 ; Shrestha et al 2015 ; Soon et al 2007 ). This result is more pronounced in soils under legume-based rotations (Gregorich et al 2001 ) where leguminous biomass is considered of high quality (i.e., a low C/N ratio) (Allard et al 2005 ; Savarese et al 2021 ). Further, Drinkwater et al ( 1998 ) found that legume-based cropping systems with lower C/N ratios of OM supported the retention of SOC.…”

Section: Crop Rotationmentioning

confidence: 99%

The effect of agroecosystem management on the distribution of C functional groups in soil organic matter: A review

et al. 2021

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To improve soil health and to aid in climate change mitigation, the quantity of soil organic matter (SOM) should be maintained or increased over the long run. In doing so, not only the total quantity of SOC but also the stability of SOC must be considered. Stability of SOC increases as a function of resistance to microbial decomposition or microbial substrate use efficiency through chemical, biological, and physical mechanisms including humification, hydrophobic moieties, molecular diversity, and formation of macroaggregates. One of the mechanisms that enhance stability confers changes in the distribution of C functional groups of SOM. To better understand and quantify how these changes are influenced by agricultural management practices, we collected 670 pairwise data from the body of literature that has evaluated changes in the distribution of C functional groups of SOM measured by solid-state 13C NMR spectroscopy. The types of agricultural managements discussed herein include (1) fertilization, (2) tillage, (3) crop rotation, (4) grazing, and (5) liming practices. Our meta-analyses show that these practices modify the distribution of C functional groups of SOM. Fertilization practices were associated with increased O-alkyl groups. Tillage resulted in increases in the SOC consisted of aromatic and carbonyl groups. Crop rotations, especially legume-based rotations, were found to increase the proportion of aromatic groups. Although there are fewer publications on tillage and crop rotation than on fertilization practices, the distribution of C functional groups may be more influenced by crop rotation and tillage practices than fertilization management—and should be a focus of future research.

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Molecular characterization of soil organic matter and its extractable humic fraction from long-term field experiments under different cropping systems

Cited by 28 publications

References 63 publications

Effects of fertilizer practice on fungal and actinobacterial cellulolytic community with different humified particle-size fractions in double-cropping field

Effects of fertilizer practice on fungal and actinobacterial cellulolytic community with different humified particle-size fractions in double-cropping field

Particle size primarily shifts chemical composition of organic matter under long‐term fertilization in paddy soil

The effect of agroecosystem management on the distribution of C functional groups in soil organic matter: A review

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