Wildfires are a global phenomenon that occur across diverse biomes, imposing deep modifications on the quantity and quality (molecular composition) of soil organic matter (SOM). Targeting SOM molecular composition is an ongoing challenge for researchers, since inherently heterogeneous material with varying functionalities interactions mineral phase. The extent duration fire-induced alterations closely tied to fire severity, which influenced by environmental factors such as climate,...

Mediterranean savannahs (dehesas) are agro-sylvo-pastoral systems with a marked seasonality, severe summer drought and favourable rainy spring autumn. These conditions forecasted to become more extreme due the ongoing global climate change. Under such conditions, it is key understand soil organic matter (SOM) dynamics at molecular level. Here, analytical pyrolysis (Py-GC/MS) combined chemometric statistical approaches was used for characterization of SOM in five-years field manipulative...

Easily extractable glomalin (EEG) is a fraction of soil organic matter thought to contain mainly glomalin-related glycoproteins produced by mycorrhizal fungi. The EEG has an impact on various ecological functions, primarily related aggregation formation and stability as well water repellence. Here, analytical pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) was used for studying the molecular composition EEG, detailed description chemical reported. Samples extracted from...

An innovative approach based on the combination of analytical pyrolysis coupled with gas chromatography-mass spectrometry (Py-GC/MS) compound-specific isotope analysis (Py-CSIA) is used to study composting process maize biomass. This multidisciplinary aims elucidate decomposition rate main biogenic materials (lignin, cellulose, proteins, lipids, and waxes) responses process. According Py-GC/MS data/structural composition, a noticeable significant decrease during first stage carbohydrates...

Dehesas are Mediterranean agro-sylvo-pastoral systems sensitive to climate change. Extreme conditions forecasted for areas may change soil C turnover, which is of relevance biogeochemistry modeling. The effect on organic matter (SOM) investigated in a field experiment mimicking environmental global scenarios (soil temperature increase, +2–3 °C, W; rainfall exclusion, 30%, D; combination both, W+D). Pyrolysis-compound-specific isotope analysis (Py-CSIA) used and H characterization SOM...

The application of organic amendments, both traditionally utilized (e.g., compost) and more recent innovations biochar), to degraded agricultural soils is being driven by international initiatives in the current context global change, such as "4 per mil initiative". main goal achieve sustainable soil quality restoration, contributing carbon (C) sequestration, while also providing a practical use value addition agro waste products. Despite generally recognized benefits applications on...

Lignin is an abundant and recalcitrant biopolymer of major relevance as soil organic matter (SOM) component playing a significant role in its stabilization. In this work, factorial field experiment was established, where three climatic treatments (W, warming; D, drought; W + warming drought), mimicking future climate change scenarios were installed over five years Mediterranean savannah "dehesa", accounting for landscape diversity (under the tree canopy open grassland). A combination...

Fire-induced alterations to soil pH and organic matter play an important role in the post-fire microbial response. However, magnitude of which each parameter affects this response is still unclear. The main objective work was determine fire-induced condition viable cultivable micro-organisms using laboratory heating, mimicking a range fire intensities. Four heating treatments were applied unaltered forest soil: unheated, 300, 450, 500 °C. In order isolate effect nutrient or heating-induced...

Compost amendments, apart from improving fertility and the general characteristics of agricultural soils, have known implications for global C cycling sequestration in soils. Their effects are usually assessed via quantification soil organic carbon (SOC) pools, labile (fast) recalcitrant (slow) with varying intrinsic decomposition rates distinct resident times. However, real C-sequestration potential additions to is still under discussion. In this study, a field trial lab incubation...

A field experiment was conducted on the Andalusian coast (Granada, Southern Spain) to study time course of nutrient release into soil after addition bagged pruning waste from subtropical orchard trees (avocado, cherimoya, and mango) urban garden over three two-year periods. N, P, K concentrations were greater in waste, whilst avocado cherimoya registered highest values for Mg. In general, micronutrient contents low all especially Cu. Macronutrient followed a three-phase dynamic: fast initial...

Changes in climatic and environmental conditions can affect both, plant chemical molecular atomic composition. Therefore, biomass carbon isotope composition is frequently used to gain information about the at time a thrives. In this field, most studies use values obtained from bulk samples. However, these are weighted average of different compounds. The isotopic characterization individual compounds represents relevant analytical advance able differentiate main components i.e.,...

Abstract Spreading of pruning waste over the soil surface may increase organic carbon, thus improving physical properties and serving as a source nutrients energy for microbial populations. The aim this study was to test effect environmental conditions biochemical composition from avocado, cherimoya, mango gardens on their decomposition process in Mediterranean subtropical climate. Bagged garden were placed ground at distance 1 m around trunk three trees each crop. concentrations C, N,...

<p><strong>Keywords: </strong>Soil reaction, analytical pyrolysis, soil respiration, carbon stabilization</p><p>During the last decade, organic matter dynamics and its determining factors have received increased attention, mainly due to evident implication of these parameters in climate change understanding, predictions possible management. High-mountain could be considered as hotspot dynamic since high accumulation low...

In this study, avocados of the Hass variety cultivated in Almuñécar (Granada, Spain) are analyzed after soil mulching with pruning debris. The mulch treatment assay was composed wastes from subtropical crops (avocado, cherimoya, and mango) garden surrounding areas. aim work is to analyze nutrient content avocado fruit effect pruning-waste on development over four years. Avocado fruits collected 2013, 2016, 2017 were weighed, their volume sugar calculated, macro- micronutrients peel, pulp,...

 Carbon isotopic composition of soils subjected to C3–C4 vegetation change can be used estimate C turnover in bulk soil, but more specifically soil organic matter (SOM) pools with fast and intermediate rates. Analysis phospholipid fatty acids (PLFA) has been widely evaluate rapid changes microbial populations. In this study we investigated the effect a experiment, along sustainable practice versus tillage community as well their by compound-specific PLFA 13C analysis.Soils...