Chemical, biochemical, and microbiological properties of Technosols produced from urban inorganic and organic wastes

Abbruzzini, Thalita Fernanda; Reyes-Ortigoza, Amada Laura; Alcántara-Hernández, Rocı́o; Mora, Lucy; Flores, L. J.; Paño, Blanca

doi:10.1007/s11368-021-03062-2

Cited by 3 publications

(1 citation statement)

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“…The Technosols evaluated in this study were produced from concrete waste (C) and excavation waste (E) combined with wood chips (W) compost (C) and biochar (B) with the aim to conduct a traditional milpa, which is a complex intercropping system of maize, bean, and squash, traditionally cultivated by Mexican farmers, in an urban environment (hereafter named urban milpa) located at the main campus of the National Autonomous University of Mexico (UNAM). Detailed information regarding the origin of the raw materials used to produce the Technosols, as well as the physical (aggregate size distribution, bulk and particle density and water holding capacity), physicochemical (pH, electrical conductivity), chemical (carbon, nitrogen and phosphorus contents, concentration of major soluble ions and readily available potentially toxic elements), biochemical (enzyme activities related to carbon, nitrogen and phosphorus cycles) and microbiological (bacterial and archaeal composition) characterization of this kind of Technosols can be found in Prado et al (2020) and Abbruzzini et al (2021).…”

Section: Site Description and Soil Samplingmentioning

confidence: 99%

Aggregation and Carbon Stabilization in Constructed Technosols Under an Urban Milpa System

Abbruzzini

Mora

Loredo-Jasso

et al. 2022

Preprint

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The dynamics of organic C pools in constructed soils for urban farming, and how these pools interact with the mineral phase to form stable aggregates, may provide important information regarding their ability to store and sequester carbon. Technosols produced from concrete and excavation waste combined with wood chips, compost, and biochar (C + WCB and E + WCB, respectively), and an all-organic control treatment (WCB), were analyzed two years after the establishment of an urban milpa system. The size distribution and stability of aggregates, the distribution of C in aggregate size fractions, and the molecular composition of their organic and mineral phases were investigated. All treatments were mostly composed of macroaggregates (80–90% of the total aggregate size distribution), with 2–8% of microaggregates and a variation of 4–14% for the silt + clay fraction. Differential allocation of C in aggregate size fractions was observed when comparing C + WCB and E + WCB Technosols, while this element was more evenly distributed in the aggregate fractions of the WCB control treatment. The presence of recalcitrant and labile C compounds in silt + clay size fractions of C + WCB evidenced its heterogeneity in terms of C cycling potential. Moreover, the E + WCB showed a higher preservation of recalcitrant C compounds in microaggregates and silt + clay fractions. Thus, the proposed Technosols presented a significant potential to stabilize C in aggregate size fractions, and may contribute to long-term C storage while providing an on-site strategy for the final disposal of this type of urban waste.

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Section: Site Description and Soil Samplingmentioning

confidence: 99%