Soil amendments from recycled waste differently affect CO₂ soil emissions in restored mining soils under semiarid conditions
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Soria Martínez, Rocío; Rodríguez-Berbel, Natalia; Ortega Pérez, Raúl; Lucas Borja, Manuel Esteban; Miralles Mellado, IsabelDate
2021-09-15Abstract
Drylands affected by serious disturbances such as mining activities lose their vegetation cover and organic soil horizons, becoming CO₂ emissions sources. Applications of organic amendments could be a good restoration solution that favours vegetation establishment and soil carbon sequestration; however, they are also associated with CO₂ emissions. Experimental plots with different organic amendments (sewage sludge, garden and greenhouse vegetable composts, and mixtures of both) and unamended soils were installed in a quarry in southeast Spain. The aim of this study was: i) to evaluate the magnitude and changes of in situ CO₂ emission from each experimental plot during a year and a half, and ii) to assess the effects of several physical–chemical (total organic carbon, total nitrogen, water retention, pH and electrical conductivity) and environmental parameters (moisture and temperature) in CO₂of the organic amendment, which was significantly higher (P < 0.05) in soils with sewage sludge...
Palabra/s clave
Organic amendments
Soil CO₂ emissions
Restored soil
Priming effect
Soil respiration
Recycled waste