Change and spatial variability of soil organic matter humification after long-term tillage and olive mill wastewater application in arid regions

Gargouri, Kamel; Mbadra, Chaker; Chaker, Rayda; Souidi, Yousra; Abbas, Ouissam; Baeten, Vincent; Rigane, Hafedh

doi:10.1071/sr19113

Cited by 8 publications

(3 citation statements)

References 52 publications

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“…In the deep layer, pH values varied between 8.74 and 9.19 in OC-CL and between 9.10 and 9.19 in OC-AR. These results were similar to those found by [61] in Sfax Tunisia in conventional tillage (cultivated soil) with alkaline pH (9.17 ± 0.76); since the SOC degradation and the CaCO 3 solubilization may affect pH, in this line, we suggest that the alkaline condition can be caused by the high concentration of the calcium carbonate.…”

Section: Soil Bulk Density and Ph In Ar And CLsupporting

confidence: 91%

Short and Long-Term Effect of Land Use and Management on Soil Organic Carbon Stock in Semi-Desert Areas of North Africa-Tunisia

et al. 2021

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Soil organic carbon (SOC) plays an important role in the global C cycle, as well as in the maintenance and improvement of the soil quality. Over time, special attention has been paid to it in the study of the SOC reserves worldwide; however, reduced attention has been given to assessing the spatial patterns of SOC stock (SOCS) in semi-desert ecosystems. In this line, there are no conclusive studies in drylands of Africa affected by aeolian processes (semi-desert conditions) mainly due to the complexity of sample collection, and this is especially significant in some soil types such as Arenosols (AR) and Calcisols (CL). This study evaluated the spatial variability of SOC and SOCS in AR and CL with woody crops in relation to land use and management (old plantations > 100 years: centenary olive grove; new plantations < 12 years: young olive grove, almond, and pistachio) in semi-desert conditions. For this purpose, 16 soil profiles (for 0–40 and 40–100 cm depth) were selected and studied in an experimental area of Menzel Chaker-Sfax in southeastern Tunisia (North Africa). The main results indicated that the SOCS on average was higher in Old Cultivated AR (OC-AR) with 41.16 Mg ha−1 compared to Newly Cultivated AR (NC-AR) with 25.13 Mg ha−1. However, the SOCS decreased after a long period of cultivation in CL from 43.00 Mg ha−1 (Newly Cultivated CL: NC-CL) to 32.19 Mg ha−1 (Old Cultivated CL: OC-CL). This indicates that in the long term, CL has more capacity to store SOC than AR, and that in the short term, AR is more sensitive to land management than CL.

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Section: Soil Bulk Density and Ph In Ar And CLsupporting

confidence: 91%

Short and Long-Term Effect of Land Use and Management on Soil Organic Carbon Stock in Semi-Desert Areas of North Africa-Tunisia

et al. 2021

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“…The E4/E6 ratio is related to the condensation degree of the aromaticity or aliphaticity and the molecular weight of organic compounds [39,42,43]. Higher E4/E6 ratios (Boa Vista neighbourhood) are generally associated with more aliphatic and low-molecular-weight structures [44], with branched and straight-chain carbons [45,46]. The greater presence of vegetation with aliphatic groups (less humified) in Boa Vista could also be observed in the greater reflectance at 725-720 nm (red region) (Figure 3b), typical of long aliphatic chains with C-C and C-H bonds [45].…”

Section: Resultsmentioning

confidence: 99%

Soil Colour and Plant-Wax Markers: Application in Forensic Investigations under Urban Subtropical Environments

et al. 2022

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Most cases involving soil in criminal investigations in Brazil have focused on the chemical and mineralogical analyses of soil fractions without including the organic matter. The organic fraction contains plant-wax markers which may be useful to “fingerprint” forensic soils due to their chemical diversity, relative longevity and resistant nature. The aim of this study was to test the long- (kilometre), medium- (metre) and short- (centimetre) scale variability of plant-wax biomarkers in a forensic context in anthropised urban soils and soils developed under subtropical conditions. Two areas from the Curitiba municipality and two areas from the Colombo municipality, Paraná State, South Brazil, were selected. Soil colour analysis was carried out to obtain reflectance data over the 360–740 nm wavelength range. Furthermore, plant-wax marker compounds (n-alkanes and fatty-alcohols) were assessed by extraction and separation into different classes and an analysis of the compounds by gas chromatography (GC/MS). The compositions of the wax-marker profiles were different in samples collected side-by-side, showing sensitivity to local variations under subtropical conditions and in areas under intense human urban disturbance. Under these conditions, biomarkers may be used in real crime scenes, even on a micrometric scale of variation.

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“…Moreover, other studies (Bayer et al2002;Ben Mbarek et al 2020) found that in arid areas, the humi cation degree of humic acids (HAs) is lower in the no-tillage system compared to the tillage system. Furthermore, no-tillage systems increases soil organic carbon storage and decreases carbon dioxide emission in the crop residue-returned farming system (Wang 2020).…”

Section: Introductionmentioning

confidence: 99%

Long-term tillage practices effects on soil organic matter humification and Humic acids structural changes in soil profiles typical of an arid region

Mahmoud

Gargouri

SÁNCHEZ-BELLÓN

et al. 2023

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Soil organic matter (SOM) humification and changes in molecular structures of humic acids (HAs) induced by long term practices management over soil profile have been scarcely investigated in arid climates. This study aims to assess SOM humification, HAs molecular structures changes over soil profiles induced by long- term tillage practices under arid climate in south-eastern Tunisia. Two experimental fields were studied: cultivated soil with olive tree and tilled for long term (CT); uncultivated without any practices with native vegetation (NT). Soil samples were collected at different depths from (CT) and (NT) profiles to determine chemical properties. Humic acids were isolated and studied by measuring UV-visible ratios (E465/665, E280/664 and E472/664) and fluorescence spectroscopy analysis. Results showed that long-term tillage practices reduced the SOM amount, aromatic condensation, molecular size and humification degree in surface layer of CT confirmed by the decrease in the emission fluorescence areas and UV- visible ratios. Inversely, in deep layers, results showed a greatly humified organic matter and aromatic structures condensation in CT. Long-term tillage leads to a significant decrease in aromatic condensation and OM humification degree in surface layers. Soil under no-tillage retains their aromatic chemical structures and increases OM humification degree. No-till System is the best alternative to maintain OM chemical structures and restore soil quality underlong- term practices management.

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Change and spatial variability of soil organic matter humification after long-term tillage and olive mill wastewater application in arid regions

Cited by 8 publications

References 52 publications

Short and Long-Term Effect of Land Use and Management on Soil Organic Carbon Stock in Semi-Desert Areas of North Africa-Tunisia

Short and Long-Term Effect of Land Use and Management on Soil Organic Carbon Stock in Semi-Desert Areas of North Africa-Tunisia

Soil Colour and Plant-Wax Markers: Application in Forensic Investigations under Urban Subtropical Environments

Long-term tillage practices effects on soil organic matter humification and Humic acids structural changes in soil profiles typical of an arid region

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