Soil textural control on moisture distribution at the microscale and its effect on added particulate organic matter mineralization

Li, Haichao; Bulcke, Jan Van den; Kibleur, Pierre; Mendoza, Orly; Sleutel, Steven

doi:10.1016/j.soilbio.2022.108777

Cited by 14 publications

(5 citation statements)

References 49 publications

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“…Nonetheless, the results on texture controlling soil organic matter mineralization are contrasting in the literature, with results being dependent on soil moisture and other experimental conditions (Li et al, 2020;Li et al, 2022). Our experiment using artificial soils with precise composition and early formation stage helped shed light on texture's and particle size effects on organic matter decomposition.…”

Section: Soil Ph Affected By Particle Size and Biochar Applicationmentioning

confidence: 86%

Biochar reduces early-stage mineralization rates of plant residues more in coarse than fine-texture soils – an artificial soil approach

Inagaki,

Weldon,

Bucka

et al. 2024

Preprint

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Abstract. Quantifying the impact of biochar on carbon persistence across soil textures is complex, owing to the variability in soil conditions. Using artificial soils with precise textural and mineral composition, we could disentangle the effects of biochar from the effects of soil particle size. We can show that biochar application significantly reduces early-stage carbon mineralization rates of plant residues in various soil textures (from 5 to 41 % clay) but more significantly in sandy soils. This finding suggests that biochar can compensate for the lack of clay in promoting C persistence in soil systems. This short report significantly contributes to understanding soil texture and biochar application interactions.

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Section: Soil Ph Affected By Particle Size and Biochar Applicationmentioning

confidence: 86%

Biochar reduces early-stage mineralization rates of plant residues more in coarse than fine-texture soils – an artificial soil approach

Inagaki,

Weldon,

Bucka

et al. 2024

Preprint

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“…Additionally, temperatures in deeper soil layers are less in uenced by atmospheric temperature uctuations compared to surface depths, which makes the fertile island effect of soil carbon less sensitive to climatic factors at this depth. In open areas, as soil sand content increases, the adsorption of nitrogen compounds by clay is inhibited, hindering the nitrogen mineralization process and resulting in reduced nitrogen content (Li et al, 2022). Furthermore, soils containing a greater proportion of sand are prone to experiencing nitrogen loss due to elevated levels of leaching and runoff (Dai et al, 2022;Zhao et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Fertile island effects across soil depths in drylands of the Tibetan Plateau

Ma,

Maestre,

Eldridge

et al. 2024

Plant Soil

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Background and aims In arid regions, patches of vegetation serve a vital function in carbon and nutrient sequestration, fostering the emergence of 'fertile islands' within the soil beneath their canopies. However, the variation in the fertile island effects across soil depth remains an open question. Methods To explore this, we sampled soils from two different layers (0-30 cm and 30-50 cm) within perennial vegetation patches and open areas across 54 drylands dispersed across the Tibetan Plateau.Our study focused on six key soil variables related to carbon, nitrogen, and phosphorus stocks, allowing us to assess the differences in fertile island effects at these varying depths.Results Among six soil fertility parameters, organic carbon exhibited the most pronounced fertile island effect at both soil depths.. In the surface soil, the in uence of vegetation in soil carbon content intensi ed with increasing precipitation seasonality and precipitation in the wettest quarter but declined with increasing temperature during the driest quarter. Conversely, in the deeper soil layer, the fertile island effect for nitrogen and phosphorus intensi ed with greater soil sand content and vegetation greenness.Conclusions The fertile island effects responded differently to environmental factors at these two depths. These ndings offer fresh and valuable insights into the interplay between environmental drivers and fertile island effects, a critical aspect of dryland ecosystems worldwide.

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“…Increased soil sand content induced by overgrazing and increased precipitation variability (Figure 5) in drylands would cause a greater loss of N with plant biomass removal (Bicharanloo et al, 2022). On the other hand, soil N mineralization also depended on clay and its effect on the sorption of N compounds (Li et al, 2022b). In the process of land degradation, the wind velocity and transport rate of soil sand increase as vegetation coverage declines, and thus sand accumulates on the land surface (Yan et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Soil fertility thresholds driven by sand content indicate drylands degradation phases on the Tibetan Plateau

Cai

Wang

et al. 2023

Land Degrad Dev

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Understanding the process of dryland degradation is crucial to combating desertification and maintaining land sustainability. To identify important indicators of dryland degradation, we conducted a field survey of 46 drylands spanning an aridity gradient across the Tibetan Plateau. Our random forest model suggested that soil sand content was the most important predictor of variation in soil fertility (carbon, nitrogen, and phosphorus). Most soil fertility showed a nonlinear and abrupt decline with increasing soil sand content, and displayed three sequential thresholds. First, soil organic carbon sharply decreased beyond a soil sand content threshold of 47%. Second, exceeding a subsequent threshold of 70%, the total nitrogen and light fraction carbon declined dramatically with increasing soil sand content. Finally, soil heavy fraction carbon, inorganic carbon, and total carbon were drastically reduced when the soil sand content exceeded 80%. The three soil fertility thresholds along the gradient of the soil sand content indicated a sequence of dryland degradation phases. Our findings provide an approach for detecting the severity of dryland degradation and suggest vulnerable areas of degradation on the Tibetan Plateau.

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Soil textural control on moisture distribution at the microscale and its effect on added particulate organic matter mineralization

Cited by 14 publications

References 49 publications

Biochar reduces early-stage mineralization rates of plant residues more in coarse than fine-texture soils – an artificial soil approach

Biochar reduces early-stage mineralization rates of plant residues more in coarse than fine-texture soils – an artificial soil approach

Fertile island effects across soil depths in drylands of the Tibetan Plateau

Soil fertility thresholds driven by sand content indicate drylands degradation phases on the Tibetan Plateau

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