Occurrence and abundance of carbohydrates and amino compounds in sequentially extracted labile soil organic matter fractions

Abdelrahman, Hamada; Olk, Dan C.; Dinnes, Dana L.; Ventrella, Domenico; Miano, Teodoro; Cocozza, Claudio

doi:10.1007/s11368-016-1437-y

Cited by 13 publications

(4 citation statements)

References 37 publications

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“…Despite its great importance for soil fertility, the total soil organic carbon (SOC) could not reflect changes of the introduction of organic practices because it often takes years before shifts in agricultural management show detectable variations in SOC content (Clark et al 1998;Yang et al 2019). In contrast, the labile pools of soil organic matter (SOM) are sensitive to short-term changes in management and/or environmental conditions (Haynes 2005), especially the light fraction (LF), the particulate organic matter (POM), and the mobile humic acid (MHA; Abdelrahman et al 2016Abdelrahman et al , 2017Marriott and Wander 2006). The LF is similar chemically to the original plant material, but a lesser amount of carbohydrates (Abdelrahman et al 2016) and a greater quantity of sterols in the LF indicate the early stage of its decomposition in soil (Gregorich et al 1996).…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, the labile pools of soil organic matter (SOM) are sensitive to short-term changes in management and/or environmental conditions (Haynes 2005), especially the light fraction (LF), the particulate organic matter (POM), and the mobile humic acid (MHA; Abdelrahman et al 2016Abdelrahman et al , 2017Marriott and Wander 2006). The LF is similar chemically to the original plant material, but a lesser amount of carbohydrates (Abdelrahman et al 2016) and a greater quantity of sterols in the LF indicate the early stage of its decomposition in soil (Gregorich et al 1996). The POM consists of partially decomposed plant litter, and it acts as a substrate and center for soil microbial activity, a shortterm reservoir of nutrients, a food source for soil fauna, and loci for formation of water stable macroaggregates (Haynes 2005).…”

Section: Introductionmentioning

confidence: 99%

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Changes in Labile Fractions of Soil Organic Matter During the Conversion to Organic Farming

Abdelrahman

Cocozza

Olk

et al. 2020

J Soil Sci Plant Nutr

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Organic farming can overcome the environmental consequences of intensive conventional farming. The objective of the work was to investigate the changes in labile soil organic matter (SOM) fractions during the conversion from conventional to organic farming in two Italian sites, namely Foggia (FG) and Metaponto (MT), which differed mainly in initial soil organic carbon (SOC) content. Fields were cultivated with lentil and wheat in rotation and treated with either compost or nitrogen or phosphorus (N/P) fertilizers in three field replicates. The SOM was sequentially fractionated into light fraction (LF), particulate organic matter (POM), and mobile humic acid (MHA) fraction. Isolated fractions were quantified and analyzed for C and N contents. Although total SOC responded to the fertilization treatments, the LF and POM fractions were yet more responsive. The MHA represented on average of 15% of SOC at both sites; however, the LF represented only 5-6% of the total SOC but was the most responsive to changes in soil management. Compost application contributed significantly greater quantities of LF, POM, and MHA than did the N/P fertilizers application. The initial SOC content can play an important role in determining the impacts of introducing organic farming practices on SOM fractions. Although both sites had an initial low SOC content, the MT site, with a lower SOC content, showed a substantial fractional C increment as compared to the FG site.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Changes in Labile Fractions of Soil Organic Matter During the Conversion to Organic Farming

Abdelrahman

Cocozza

Olk

et al. 2020

J Soil Sci Plant Nutr

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“…and MBN with SSN and quantitatively corresponds to the sum of the hydrochloric acid hydrolysable amino acid N and hydrochloric acid hydrolysable unknown N (Abdelrahman et al, 2016). Some studies have also suggested that it includes amino acids, humic acids, and N-containing heterocyclic compounds bound to minerals (Nannipieri and Eldor, 2009;Wu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

N in granular compost accelerates crop use of soil N

Guo,

Wang,

Wang

et al. 2023

Preprint

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Granulation represents a promising strategy for modifying nitrogen (N) release from compost in soil. Nevertheless, there is a lack of large-scale field trials exploring its impact on crop production and soil N supply. We conducted a preliminary study by employing 15N tracing technology to investigate the effects of granular compost on soil N transformation and supply, on the yield and quality of tobacco leaves, and on the distribution of granular compost-derived N among the different soil N pools and tobacco plant organs. The results revealed that the 2 cm diameter granule fertilizer treatment (G2) significantly increased tobacco leaf yield by 15% compared to CK. However, the G4 treatment resulted in a reduction in leaf yield. Notably, the quality of tobacco leaves remained unaffected, with N content ranging from 15 to 25 g kg-1, which was within a normal range. The results also indicated that direct N supply to the crops from granular compost was limited. The G2 and G4 treatments provided 2.8% and 2.2% of the N in the fertilizer to the tobacco plants, respectively, with more than 93% of the N in the tobacco plants derived from the soil. Therefore, granular compost facilitated the absorption of soil N by tobacco plants. At the end of the growth period, the N content derived from the G4 granular fertilizer in the soil was significantly higher than that from the G2 fertilizer. This may be due to the slower nutrient release mechanism and longer release period of the G4 fertilizer compared to G2. Our results suggested that granulated compost fertilizer has the potential to enhance soil N supply. However, G2 may also have a higher potential for N loss. Further investigations under field conditions are necessary to validate the applicability of granular fertilizer and its specific mechanisms of impact.

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“…Owing to the large background of relatively stable C in soil, it is not easy to measure changes in soil total organic C (TOC) in the short term. Soil labile organic C, which is characterized by rapid turnover times and responds quickly, could be regarded as an early indicator of changes in SOC [14,15]. It generally includes particulate organic C (POC), microbial biomass C (MBC), and potassium permanganate-oxidizable C (KMnO 4 -C) [16].…”

Section: Introductionmentioning

confidence: 99%

Changes in Soil Organic Carbon and Its Labile Fractions after Land Conversion from Paddy Fields to Woodlands or Corn Fields

Sun

et al. 2021

Agronomy

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Land use change could significantly affect soil organic carbon (SOC) and other soil chemical properties. However, the responses of soil labile C fractions at different soil depths to land-use change are not still clear. The aim of this study was to investigate the effect of paddy field conversion on woodlands or corn fields on total soil organic C (TOC) and its labile C fractions including particulate organic C (POC), microbial biomass C (MBC), and potassium permanganate-oxidizable C (KMnO4–C) along a 0–100 cm soil profile. Our results indicate that soil TOC concentrations increased by 3.88 g kg−1 and 3.47 g kg−1 in the 0–5 cm soil layer and 5.33 g kg−1 and 4.68 g kg−1 in the 5–20 cm soil layer during 13 years after the conversion from paddy fields to woodlands and corn fields, respectively. In the 20–40 cm soil layer, the woodlands had the highest TOC concentration (12.3 g kg−1), which was 5.13 g kg−1 and 3.5 g kg−1 higher than that of the paddy and corn fields, respectively. The increase in TOC was probably due to the absence of soil disturbance and greater root residue input into the woodland soil. In corn fields, pig manure addition contributed to the increase in soil organic C concentrations. In addition, the proportion of soil KMnO4–C increased after conversion from paddy fields to woodlands or corn fields in the 0–40 cm soil layer, ranging from 39.9–56.6% for the woodlands and 24.6–32.9% for the corn fields. The soil POC content was significantly higher in woodland and corn field soils than in paddy field soils at lower soil depths (5–40 cm). However, there were no differences in MBC contents in the whole soil profile between the woodlands and paddy fields. The KMnO4–C and MBC was the most important factor affecting the CMI values through the whole 0–100 cm soil profile. Overall, converting paddy fields to woodlands or corn fields increased the TOC and labile C fractions in the 0–40 cm soil layer. Future studies should focus on the response of the deeper soil C pool to land-use change.

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Occurrence and abundance of carbohydrates and amino compounds in sequentially extracted labile soil organic matter fractions

Cited by 13 publications

References 37 publications

Changes in Labile Fractions of Soil Organic Matter During the Conversion to Organic Farming

Changes in Labile Fractions of Soil Organic Matter During the Conversion to Organic Farming

N in granular compost accelerates crop use of soil N

Changes in Soil Organic Carbon and Its Labile Fractions after Land Conversion from Paddy Fields to Woodlands or Corn Fields

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