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• W3033324817 abstract "Abstract As tropical savannas are undergoing rapid conversion to other land uses, native C 3 ‐C 4 vegetation mixtures are often transformed to C 3 ‐ or C 4 ‐dominant systems, resulting in poorly understood changes to the soil carbon (C) cycle. Conventional models of the soil C cycle are based on assumptions that more labile components of the heterogenous soil organic C (SOC) pool decompose at faster rates. Meanwhile, previous work has suggested that the C 4 ‐derived component of SOC is more labile than C 3 ‐derived SOC. Here we report on long‐term (18 months) soil incubations from native and transformed tropical savannas of northern Australia. We test the hypothesis that, regardless of the type of land conversion, the C 4 component of SOC will be preferentially decomposed. We measured changes in the SOC and pyrogenic carbon (PyC) pools, as well as the carbon isotope composition of SOC, PyC and respired CO 2 , from 63 soil cores collected intact from different land use change scenarios. Our results show that land use change had no consistent effect on the size of the SOC pool, but strong effects on SOC decomposition rates, with slower decomposition rates at C 4 ‐invaded sites. While we confirm that native savanna soils preferentially decomposed C 4 ‐derived SOC, we also show that transformed savanna soils preferentially decomposed the newly added pool of labile SOC, regardless of whether it was C 4 ‐derived (grass) or C 3 ‐derived (forestry) biomass. Furthermore, we provide evidence that in these fire‐prone landscapes, the nature of the PyC pool can shed light on past vegetation composition: while the PyC pool in C 4 ‐dominant sites was mainly derived from C 3 biomass, PyC in C3‐dominant sites and native savannas was mainly derived from C 4 biomass. We develop a framework to systematically assess the effects of recent land use change vs. prior vegetation composition." @default.
• W3033324817 created "2020-06-12" @default.
• W3033324817 creator A5000282094 @default.
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• W3033324817 date "2020-07-28" @default.
• W3033324817 modified "2023-09-26" @default.
• W3033324817 title "Land transformation in tropical savannas preferentially decomposes newly added biomass, whether C₃ or C₄ derived" @default.
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• W3033324817 doi "https://doi.org/10.1002/eap.2192" @default.
• W3033324817 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32510803" @default.
• W3033324817 hasPublicationYear "2020" @default.
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