Potential for agricultural recycling of struvite and zeolites to improve soil microbial physiology and mitigate CO2 emissions

作者：Giulio Galamini, Giacomo Ferretti, Christoph Rosinger, Stefan A. Huber, Axel Mentler, Eugenio Díaz‐Pinés, Barbara Faccini, Katharina Keiblinger · 发表于：Geoderma · 年份：2024 · DOI：10.1016/j.geoderma.2024.117149 · 被引用次数：13 · 研究领域：Phosphorus and nutrient management、Adsorption and biosorption for pollutant removal

• Struvite and N–enriched zeolites enhance nutrient recycling in agroecosystems. • All treatments raised soil pH, boosting microbial enzyme production and activity. • Organic C availability increased CO 2 emissions, especially with digestate fertilizer. • Zeolitized tuffs reduced CO 2 emissions, likely due to CO 2 adsorption capacity. • Increased soil pH favoured microbial N–cycling over C–cycling in the soil. Recycling nutrients in agroecosystems is becoming increasingly important to promote agricultural sustainability. Struvite and nitrogen (N)-enriched zeolites produced via wastewater treatment offer the potential for nutrient recycling. However, their effects on soil properties, particularly on microbial physiology, remain largely unknown; especially regarding microbial feedback, from which losses or sequestration of essential elements may result. This study investigates the short-term (three days) physiological responses of soil microorganisms, changes in available nutrients, and the immediate effects on soil organic matter (SOM) and carbon dioxide (CO 2 ) emissions following the application of struvite and N-enriched zeolites derived from liquid digestate, alongside natural zeolites amendments in an acidic sandy soil. All treatments increased soil pH, which emerged as a driving factor in the dissolution of labile organic carbon (C) and the microbial production of N-, C-, and phosphorus (P)-acquiring extracellular enzymes. As soil pH increased, the stoichiometric ratio o...