Interactions among soil texture, pore structure, and labile carbon influence soil carbon gains

Lee, Jin Ho; Lucas, Maik; Guber, Andrey K.; Li, Xiufen; Kravchenko, Alexandra N.

doi:10.1016/j.geoderma.2023.116675

Cited by 7 publications

(5 citation statements)

References 105 publications

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“…POM in soils with high sand contents might decompose slower than that in the soils with low sand contents due to lower microbial activity at organo-mineral surfaces of sand grains (Haddix et al, 2020;Kaiser, Mueller, Joergensen, Insam, & Heinemeyer, 1992;Kögel-Knabner et al, 2008). Indeed, a negative correlation between sand contents and microbial biomass C was found across our experimental sites in a parallel study (Lee, Lucas, Guber, Li, & Kravchenko, 2023). Thus, in coarsertextured soils, the size of POM residues might not be decreasing as quickly as in the finer-textured soils, and the region around the POM may not be completely empty yet (Fig.…”

Section: Influences Of Soil Texture On Detritusphere Poresmentioning

confidence: 53%

“…At each site a randomized complete block design experiment with 3 (Hancock) or 4 (the rest of the sites) replications has been established in 2013. Details on the research sites and soil descriptions have been reported by Kasmerchak and Schaetzl (2018) and Lee et al (2023).…”

Section: Experimental Design and Soil Sample Collectionsmentioning

confidence: 99%

“…2D), we would expect to also detect the differences in terms of POM occupation between the two plant systems. Soils of restored prairie have developed higher SOM (Sanford, 2014;Sprunger & Robertson, 2018), thus better plant growth conditions, and much more active and abundant microbial communities (Lange et al, 2015), e.g., significantly higher microbial biomass C (Lee et al, 2023), than those of the monoculture switchgrass. Yet, there were no significant differences between the two systems in terms of POM occupation of the biopores (Fig.…”

Section: Influences Of Soil Texture On Detritusphere Poresmentioning

confidence: 99%

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Pore structure in detritusphere of soils under switchgrass and restored prairie vegetation community

Lee,

Lucas,

Guber

et al. 2023

Preprint

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Root detritusphere, i.e., the soil in vicinity of decomposing root residues, plays an important role in soil microbial activity and C sequestration. Pore structure (size distributions and connectivity of soil pores) in the detritusphere serves as a major driver for these processes and, in turn, is influenced by physical characteristics of both soil and roots. This study compared pore structure characteristics in root detritusphere of soils of contrasting texture and mineralogy subjected to >6 years of contrasting vegetation: monoculture switchgrass and polyculture prairie systems. Soil samples were collected from five experimental sites in the US Midwest representing three soil types. Soil texture and mineralogy were measured using hydrometer and X-ray powder diffraction, respectively. The intact cores were scanned with X-ray computed micro-tomography to identify visible soil pores, biopores, and particulate organic matter (POM). We specifically focused on pore structure within the detritusphere around the POM of root origin. Results showed that detritusphere of coarser-textured soils, characterized by high sand and quartz contents, had lower porosity in the vicinity of POM compared to finer-textured soils. POM vicinities in finer soils had high proportions of large (>300 μm Ø) pores, and their pores were better connected than in coarser soils. Lower porosity in outer (>1 mm) parts of detritusphere of switchgrass than of prairie suggested soil compaction by roots, and the effect especially pronounced in coarser soils. The results demonstrated that soil texture and mineralogy played a major, while vegetation a more modest, role in defining the pore structure in root detritusphere.

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Section: Influences Of Soil Texture On Detritusphere Poresmentioning

confidence: 53%

Section: Experimental Design and Soil Sample Collectionsmentioning

confidence: 99%

Section: Influences Of Soil Texture On Detritusphere Poresmentioning

confidence: 99%

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Pore structure in detritusphere of soils under switchgrass and restored prairie vegetation community

Lee,

Lucas,

Guber

et al. 2023

Preprint

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“…Soil samples were collected from the Cellulosic Biofuel Diversity Experiment located at the Kellogg Biological Station Long-term Ecological Research Site 76 , Hickory Corners, Michigan. The studied soil is a mesic Typic Hapludalf with 52% sand, 39% silt, and 9% clay 77 . The experiment is a randomized complete block (RCB) design established in 2008.…”

Section: Methodsmentioning

confidence: 99%

Composition and metabolism of microbial communities in soil pores

Li,

Kravchenko,

Cupples

et al. 2024

Nat Commun

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Delineation of microbial habitats within the soil matrix and characterization of their environments and metabolic processes are crucial to understand soil functioning, yet their experimental identification remains persistently limited. We combined single- and triple-energy X-ray computed microtomography with pore specific allocation of 13C labeled glucose and subsequent stable isotope probing to demonstrate how long-term disparities in vegetation history modify spatial distribution patterns of soil pore and particulate organic matter drivers of microbial habitats, and to probe bacterial communities populating such habitats. Here we show striking differences between large (30-150 µm Ø) and small (4-10 µm Ø) soil pores in (i) microbial diversity, composition, and life-strategies, (ii) responses to added substrate, (iii) metabolic pathways, and (iv) the processing and fate of labile C. We propose a microbial habitat classification concept based on biogeochemical mechanisms and localization of soil processes and also suggests interventions to mitigate the environmental consequences of agricultural management.

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“…At the same time, DOC can adsorb to clay minerals, resulting in greater retention of DOC with greater clay content 27, 28, 29 . Soil texture can also influence plant and microbial access to nutrients 30, 31 and SOC dynamics 32, 33 to contribute to spatial patterns in soil NO 3 - and DOC. Sub-field variation in soil texture may result from the accumulated impact of subtle, long-term patterns in surface hydrology that transported clay into localized micro-depressional areas now characterized by higher clay content 34 .…”

Section: Potential Drivers Of Spatial Variation In Soil No3- and Docmentioning

confidence: 99%

A new conceptual framework explaining spatial variation in soil nitrous oxide emissions

Zhang,

Eddy,

Stuchiner

et al. 2023

Preprint

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Soil emissions of nitrous oxide (N2O), a potent greenhouse gas, contribute substantially to global warming from agriculture. Spatial variation in N2O emissions within agricultural fields leads to high uncertainty in the benefits of climate-smart agricultural practices. Here, we present a new conceptual framework explaining spatial variation in soil N2O emissions developed from high spatial resolution automated measurements of soil N2O emissions together with measurements of gross N2O fluxes and soil physicochemical properties in two separately managed maize fields in central Illinois, USA. We found that sub-field locations with consistently low N2O emissions had distinct biogeochemical properties compared to locations where high emissions occurred episodically, leading to spatial variation in which factors control N2O production rates. In the consistent N2O cold spots, soil nitrate (NO3-) and dissolved organic carbon (DOC) constrained N2O production irrespective of changes in soil moisture. In contrast, in the episodic N2O hot spots which had higher soil NO3-and DOC availability, N2O production was stimulated by increases in soil moisture. These findings form the ‘cannon model’ which conceptualizes how sub-field scale variation in soil NO3-and DOC determines where increases in soil moisture can trigger high soil N2O emissions within agricultural fields.

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Interactions among soil texture, pore structure, and labile carbon influence soil carbon gains

Cited by 7 publications

References 105 publications

Pore structure in detritusphere of soils under switchgrass and restored prairie vegetation community

Pore structure in detritusphere of soils under switchgrass and restored prairie vegetation community

Composition and metabolism of microbial communities in soil pores

A new conceptual framework explaining spatial variation in soil nitrous oxide emissions

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