Stability of Organic Matter in Anthropic Soils: A Spectroscopic Approach

Hernandez‐Soriano, Maria C.; Sevilla-Perea, A.; Kerré, Bart; Mingorance, M.D.

doi:10.5772/55632

Cited by 7 publications

(4 citation statements)

References 38 publications

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“…There are several mechanisms of enhancing the MRT and thus stabilizing SOC (Hernandez‐Soriano, Sevilla‐Perea, Kerré, & Mingorance, ; Six, Conant, Paul, & Paustian, ) including physical, chemical, microbial, biochemical, and ecological (Table ). Indeed, molecular structure is not as important to MRT as is the environment (Han, Sun, Jin, & Xing, ), SOC is an ecosystem property and its turnover is governed by accessibility rather than recalcitrance.…”

Section: Processes and Factors Affecting Soil Organic Carbon Sequestrmentioning

confidence: 99%

Digging deeper: A holistic perspective of factors affecting soil organic carbon sequestration in agroecosystems

Lal

2018

Global Change Biology

528

239

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The global magnitude (Pg) of soil organic carbon (SOC) is 677 to 0.3-m, 993 to 0.5-m, and 1,505 to 1-m depth. Thus, ~55% of SOC to 1-m lies below 0.3-m depth. Soils of agroecosystems are depleted of their SOC stock and have a low use efficiency of inputs of agronomic yield. This review is a collation and synthesis of articles published in peer-reviewed journals. The rates of SOC sequestration are scaled up to the global level by linear extrapolation. Soil C sink capacity depends on depth, clay content and mineralogy, plant available water holding capacity, nutrient reserves, landscape position, and the antecedent SOC stock. Estimates of the historic depletion of SOC in world soils, 115-154 (average of 135) Pg C and equivalent to the technical potential or the maximum soil C sink capacity, need to be improved. A positive soil C budget is created by increasing the input of biomass-C to exceed the SOC losses by erosion and mineralization. The global hotspots of SOC sequestration, soils which are farther from C saturation, include eroded, degraded, desertified, and depleted soils. Ecosystems where SOC sequestration is feasible include 4,900 Mha of agricultural land including 332 Mha equipped for irrigation, 400 Mha of urban lands, and ~2,000 Mha of degraded lands. The rate of SOC sequestration (Mg C ha year ) is 0.25-1.0 in croplands, 0.10-0.175 in pastures, 0.5-1.0 in permanent crops and urban lands, 0.3-0.7 in salt-affected and chemically degraded soils, 0.2-0.5 in physically degraded and prone to water erosion, and 0.05-0.2 for those susceptible to wind erosion. Global technical potential of SOC sequestration is 1.45-3.44 Pg C/year (2.45 Pg C/year).

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Section: Processes and Factors Affecting Soil Organic Carbon Sequestrmentioning

confidence: 99%

Digging deeper: A holistic perspective of factors affecting soil organic carbon sequestration in agroecosystems

Lal

2018

Global Change Biology

528

239

View full text Add to dashboard Cite

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“…the microbial behaviour or activity, it also influences the behaviour of the organic matter which influences microbial activity too. In this respect the concentration hydrogen ions and polyvalent cations are important in determining the solubility/stability of organic matter and thus the possibility for microbial attack (Hernandez-Soriano et al, 2013). While at low pH hydrogen bonding among organic matter molecules reduces their solubility, higher pHs (>5) deprotonate these molecules increasing their solubility as a result of a decrease of the bonding between organic compounds and soil particles (destabilisation) (Sollins et al, 1996).…”

Section: Ph and Nutrient Availabilitymentioning

confidence: 99%

Impacts of pH on mechanisms and rates of carbon and nitrogen mineralisation: a review

Breugem,

Kros,

de Vries

2024

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Decomposition of soil organic matter (SOM) plays an important role in nutrient (re)cycling in all ecosystems of the world. Decomposition of SOM in soils is mainly a soil microbial process. Soil pH affect many soil characteristics which in turn affect the microbial indicators, such as microbial composition, biomass and growth and thereby the microbial activity. This activity governs the mineralisation processes of soil organic matter and is strongly pH dependent. This report gives first an overview of the mechanisms behind impacts of pH on these microbial indicators as well of the impacts of pH on microbial indicators themselves of which pH influences on the major decomposition process do get much attention. Next, it presents empirical quantitative relationships between pH and the mineralisation processes respiration, ammonification and nitrification. Finally, the report gives recommendations on how to include pH dependent relationships in SOM decomposition models.

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“…As the increases were almost identical, no difference was observed between the individual treatments of fertilization and control, but between the levels of NPK fertilization in 2008-2020. Before the experiment, the area had been cultivated for centuries; therefore, it was assumed that the contents of SOM and humic substances stabilized before the experiment was established [39,40]. The setting up of the experiment and sowing grasses into inter-rows of the vine might have upset the balance in SOM [41].…”

Section: Soil Organic Matter and Humic Substancesmentioning

confidence: 99%

Changes in Relationships between Humic Substances and Soil Structure following Different Mineral Fertilization of Vitis vinifera L. in Slovakia

et al. 2022

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The quantity and quality of soil organic matter (SOM) depending on many edaphic and environmental factors may change in response to agriculture-related practices. The SOM humification process can be supported by the application of mineral fertilizers, but in the production vineyards, such information is lacking. NPK fertilizer alters the soil quality, and therefore, the aim of this study was to: (1) assess the extent and dynamics of different NPK (control—no fertilization; 1st NPK; and 3rd NPK levels) rates to the soil with grass sward cover in a productive vineyard on changes in SOM, humic substances (HSs), and soil structure, and (2) identify relationships between SOM, HSs, and soil structure. Results showed that the share of humic acids in soil organic carbon decreased only in NPK1 compared to control and NPK3 treatments. The color quotient of humic substance values in NPK1 and NPK3 increased by 4 and 5%, respectively, compared to control. Over a period of 14 years, the content of soil organic carbon increased by 0.71, 0.69, and 0.53 g kg−1 year−1 in the control, NPK1, and NPK3, respectively. The content of HSs increased linearly with slight differences due to NPK application. The vulnerability of the soil structure decreased due to fertilization—more at the higher NPK level. The rate of formed soil crust was decreasing in the following order: control > NPK1 > NPK3. In the control treatment, the relations between SOM, HSs, and soil structure were most abundant and with the greatest significance, while with the increasing level of NPK, these relations lost their significance.

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Stability of Organic Matter in Anthropic Soils: A Spectroscopic Approach

Cited by 7 publications

References 38 publications

Digging deeper: A holistic perspective of factors affecting soil organic carbon sequestration in agroecosystems

Digging deeper: A holistic perspective of factors affecting soil organic carbon sequestration in agroecosystems

Impacts of pH on mechanisms and rates of carbon and nitrogen mineralisation: a review

Changes in Relationships between Humic Substances and Soil Structure following Different Mineral Fertilization of Vitis vinifera L. in Slovakia

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