Do composted bioamendments enhance the resistance of Mediterranean agricultural soils and their microbial carbon use efficiency to extreme heat-stress events?
Sana Boubehziz, Emily C. Cooledge, David Robert Chadwick, Vidal Barrón, Antonio Rafael Sánchez-Rodríguez, Davey Leonard Jones
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引用次数: 0
Abstract
Abstract. Mediterranean agroecosystems are vulnerable to extreme heat-stress, especially because of their low organic matter content. Bioamendments may enhance soil nutrient content and microbial resilience to heatwaves. However, their effectiveness under these conditions is still unclear. We investigated the effect of bioamendments (composted olive mill pomace, biosolids and solid urban residue) and a conventional fertiliser (diammonium phosphate) on microbial carbon use efficiency (CUE), and soil biogeochemistry in two different soils, a calcareous Vertisol and a non-calcareous Inceptisol, with low P availability, subjected to extreme heat-stress. We conducted warming experiments (20, 30, 40, or 50 °C), to monitor 14C-glucose mineralization and to evaluate modifications in soil biochemical properties. As result of warming, both soils microorganisms exhibited thermotolerance until 40 °C, with a critical shift in microbial respiration observed at 50 °C. Consequently, microbial CUE, which was a function of the bioamendments and soil, significantly declined from 0.47–0.65 at 20 °C to 0.27–0.45 at 50 °C (p < 0.05), with the control decreasing by 0.010 ± 0.001 °C-1 (Vertisol) and 0.007 ± 0.001 °C-1 (Inceptisol). Moreover, composted olive mill pomace-treated soils enhanced the resistance of soils to heat stress as they produced the highest microbial CUE at 40 °C in the Inceptisol and 50 °C in both soils (0.43 ± 0.02 Inceptisol vs. 0.45 ± 0.02 Vertisol). Soil biogeochemistry varied with temperature and treatment, while available P in soils treated with diammonium phosphate was reduced with temperature in both soils, and available P added with bioamendments was not affected by temperature but was increased with biosolids for all temperatures in the Inceptisol. In conclusion, organic matter rich bioamendments (composted olive mill pomace) may enhance the resistance of Mediterranean agricultural soils subjected to extreme heat-stress events (50 °C).
SoilAgricultural and Biological Sciences-Soil Science
CiteScore
10.80
自引率
2.90%
发文量
44
审稿时长
30 weeks
期刊介绍:
SOIL is an international scientific journal dedicated to the publication and discussion of high-quality research in the field of soil system sciences.
SOIL is at the interface between the atmosphere, lithosphere, hydrosphere, and biosphere. SOIL publishes scientific research that contributes to understanding the soil system and its interaction with humans and the entire Earth system. The scope of the journal includes all topics that fall within the study of soil science as a discipline, with an emphasis on studies that integrate soil science with other sciences (hydrology, agronomy, socio-economics, health sciences, atmospheric sciences, etc.).