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- W2248830395 abstract "Carbonates in the topsoil of many Mediaterranean soils interact with soil organic carbon (SOC) and aggregation dynamics, by decreasing organic matter mineralization and enhancing aggregate stability. The relative contribution of SOC and carbonates in two Mediterranean soils were studied. We hypothesized that SOC-carbonates interaction can alter aggregation hierarchy and that the relative role of these cementing agents can change depending on aggregate-size fractions. Topsoil (0-20 cm) of a carbonated (Typic Calcixerept) and a non-carbonated (Typic Haploxerept) soil were forced to pass a 250 µm sieve and incubated at 25 oC for 63 days with the following treatments: carbonated (C) or non-carbonated (NC) soil with (ST) and without (NST) maize straw. Aggregates dynamics in the non-carbonated soil was controlled by organic matter, according to aggregation hierarchy (Six et al. 1998). Unlike the non-carbonated soil, we observed that carbonates had a major role in macroaggregate (>250 µm) formation at low SOC content in C.NST. Maize straw addition enhanced macroaggregates percentage in C.ST compared to C.NST. Microaggregates (50-250 µm) within macroaggregates percentage was similar in both treatments at day 21, but it was greater in C.ST than in C.NST thereafter. No effect of carbonates was observed in macroaggregates >2000 µm in the carbonate-rich soil. We concluded that carbonates presence in the carbonate-rich soil can interfere with SOC dynamics by modifying the aggregation hierarchy of soils as that described in the non-carbonated soil." @default.
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- W2248830395 date "2010-01-01" @default.
- W2248830395 modified "2023-09-23" @default.
- W2248830395 title "Relative contribution of naturally-occurring carbonates and soil organic carbon to soil aggregation dynamics" @default.
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