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- W4200178494 endingPage "115667" @default.
- W4200178494 startingPage "115667" @default.
- W4200178494 abstract "Placement and fate of photo-assimilated carbon (C) newly added to the soil are important contributors of soil health. Soil pores control the movement of gasses, water, and microorganisms, thus potentially influencing new photo-assimilated C gains and losses. The objective of this study was to explore the associations between soil pores and additions and losses of root-derived C. Young cereal rye (Secale cereale L.) plants were grown in soil with inherent pore architecture destroyed by sieving and in soil with intact pore architecture, with each rye planted container having a section inaccessible to plant roots. Plants were pulse labeled with 13CO2, followed by sampling of intact soil cores and subjecting them to X-ray computed micro-tomography (µCT) scanning, some immediately after collection and some after a 21-day incubation. From the scanned cores we obtained soil micro-samples in specific locations corresponding to µCT images. The µCT images were used to quantify pore size distributions of the micro-sample soils, while soil δ13C signatures provided a quantitative measure of the presence of root-derived C before and after the incubation. In the intact soils, δ13C was positively associated with > 90 µm Ø pores, likely reflecting preferential rye root growth into legacy root channels. In soils where existing pore architecture was destroyed, 13C was preferentially added to 15–90 μm Ø pores when the soil was accessible to roots and to 7–40 μm Ø pores when the soil was accessible only to fungi, yet after the incubation the associations between 13C and pores were lost. The results identified the pore sizes associated with root-derived C additions to the soil via root and fungal routes and highlighted the importance of inherent pore architecture on the placement and persistence of such additions." @default.
- W4200178494 created "2021-12-31" @default.
- W4200178494 creator A5072502066 @default.
- W4200178494 creator A5081691772 @default.
- W4200178494 date "2022-03-01" @default.
- W4200178494 modified "2023-10-18" @default.
- W4200178494 title "Inputs of root-derived carbon into soil and its losses are associated with pore-size distributions" @default.
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- W4200178494 doi "https://doi.org/10.1016/j.geoderma.2021.115667" @default.
- W4200178494 hasPublicationYear "2022" @default.