Climate change has a strong influence on soil organic carbon (SOC) stock and vulnerability, as well as on microbial biodiversity, across different agroecosystems including vineyards. A randomized block design, consisting of 3 blocks composed of 8 plots each, and two factors, i.e., land management practice (amendment, cover crop, bare soil) and climate manipulation (ambient temperature, warming), was set up in three study areas within the Veneto region (North of Italy). Open top chambers (OTC) were used to obtain a temperature increase of ~2 °C (SSP2-4.5). Soil samples will be collected at four times (after 0, 6, 12, and 18 months from the OTC placement) and at 3 depths (0-15, 15-30, and 30-45 cm) and characterized from the physical, chemically and microbiological point of view. From each sample, particulate and mineral-associated organic matter (POM and MAOM respectively) were isolated and characterized by elemental and thermal analysis. DNA was extracted from topsoils (0-15 cm) and metagenomic analyses were carried out. The preliminary results show that, as expected, no significant differences in SOC stocks occur following 6 months of warming, while a general and slight increase in carbon concentration already occurs in plots with cover crops. In the latter, POM plays a greater role in SOC accrual but, regardless of the vineyard and the agronomic management, is the more labile one, as estimated by thermal analysis. Conversely, MAOM represents the main SOC pool, whose stability increases with depth. The microbiological analysis highlighted a significant difference in bacterial populations among the study areas. On the other hand, no significant differences were observed among treatments and climate manipulations. It is expected that results obtained after 12 and 18 months will help to better understand the effects of management practices in SOC and microbial dynamics in vineyards under a climate change scenario.
Carbon sequestration potential and microbial diversity in vineyards under a climate change scenario – Preliminary results
Galluzzi G.
;Andreolli M.;Lampis S.;Zaccone C.
2025-01-01
Abstract
Climate change has a strong influence on soil organic carbon (SOC) stock and vulnerability, as well as on microbial biodiversity, across different agroecosystems including vineyards. A randomized block design, consisting of 3 blocks composed of 8 plots each, and two factors, i.e., land management practice (amendment, cover crop, bare soil) and climate manipulation (ambient temperature, warming), was set up in three study areas within the Veneto region (North of Italy). Open top chambers (OTC) were used to obtain a temperature increase of ~2 °C (SSP2-4.5). Soil samples will be collected at four times (after 0, 6, 12, and 18 months from the OTC placement) and at 3 depths (0-15, 15-30, and 30-45 cm) and characterized from the physical, chemically and microbiological point of view. From each sample, particulate and mineral-associated organic matter (POM and MAOM respectively) were isolated and characterized by elemental and thermal analysis. DNA was extracted from topsoils (0-15 cm) and metagenomic analyses were carried out. The preliminary results show that, as expected, no significant differences in SOC stocks occur following 6 months of warming, while a general and slight increase in carbon concentration already occurs in plots with cover crops. In the latter, POM plays a greater role in SOC accrual but, regardless of the vineyard and the agronomic management, is the more labile one, as estimated by thermal analysis. Conversely, MAOM represents the main SOC pool, whose stability increases with depth. The microbiological analysis highlighted a significant difference in bacterial populations among the study areas. On the other hand, no significant differences were observed among treatments and climate manipulations. It is expected that results obtained after 12 and 18 months will help to better understand the effects of management practices in SOC and microbial dynamics in vineyards under a climate change scenario.
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