Factors affecting the distribution and dynamics of14C in two soils cropped to barley

Dinwoodie, Gordon; Juma, N. G.

doi:10.1007/bf02143546

Cited by 10 publications

(2 citation statements)

References 25 publications

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“…Water availability could increase the production of plant biomass, root exudation, and residues that can be incorporated into the soil. It could, over the long term, also feedback into additional organic carbon accrual (Dinwoodie and Juma, 1988). The highest SOC concentration (> 25 %) was observed at a low estimated water table depth (< 0.2 m) and elevation, where the mass of the fungi community was in a higher range (> 110 nmol g -1 soil) in both lands.…”

Section: Topography Variables In Relation To Soil Quality Indicators In Different Land-usesmentioning

confidence: 98%

Spatial variation of soil quality indicators as a function of land use and topography

Kiani¹,

Hernandez‐Ramirez

Quideau

2020

Can. J. Soil. Sci.

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Soil quality (SQ) indicators such as plant available water (PAW), soil organic carbon (SOC), and microbial biomass carbon (MBC) can reveal agroecological functions; however, their spatial variabilities across contrasting land uses need to be better understood. This study examined the spatial variation of these key SQ indicators as a function of two land-use systems and using topography covariates. We sampled a total of 116 point locations in a native grassland (NG) site and an irrigated cultivated (IC) site located near Brooks, Alberta. Compared with NG, cultivation altered soil pore-size distribution by sharply reducing macroporosity by 25%. However, conditions in the IC soil supported greater accrual of microbial growth (MBC of 601 vs. 812 nmol phospholipid fatty acids g−1 soil) probably due to more availability of water and nutrients. Focusing on the effects of topography on SQ indicators, terrain elevation (by light detection and ranging) and estimated depth-to-water were found to be key controllers of SQ at the two land-use systems. Also, there were gradual increases in both SOC and MBC where estimated water table was deeper, and higher SOC also associated with lower elevation. A comparison of ordinary kriging and cokriging (coK) geostatistical mapping indicated that the coK method performed better as demonstrated by improvements in the accuracies of spatial estimations of PAW, SOC concentration, and MBC. Thus, implementing coK using the aforementioned topography covariates enhances the capability for predictive mapping of SQ, which is particularly useful when spatial data for key SQ indicators are sparse and challenging to measure.

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Section: Topography Variables In Relation To Soil Quality Indicators In Different Land-usesmentioning

confidence: 98%

Spatial variation of soil quality indicators as a function of land use and topography

Kiani¹,

Hernandez‐Ramirez

Quideau

2020

Can. J. Soil. Sci.

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“…Xu. Dinwoodie and Juma used 14 C to study carbon dynamics in barley plots, using a Minaxi β Tri-Carb 4000 series scintillation counter to measure 14 C activity (Dinwoodie and Juma 1988). Later, Xu and Juma used 14 C to study kinetics in root systems (Xu and Juma 1993, 1995.…”

Section: Radioactive Isotope Workmentioning

confidence: 99%

Isotope applications to soil science at the University of Alberta — an historical perspective

Feland

Quideau

2020

Can. J. Soil. Sci.

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For the past 70 yr, researchers in the Soil Science/Renewable Resources Department at the University of Alberta have used isotopes to study topics of ecological importance. This review highlights the soil isotope research conducted within our department over this time, including an historical overview of studies of interest. Analytical techniques and advances in instrumentation are discussed, focusing on the measurement of light stable isotope ratios (i.e., for C, H, N, S, and O) using isotope ratio mass spectrometry (IRMS). Early soil isotope work (1950–2000s) focused on agricultural soils and soil fertility issues. These studies included the use of radioactive isotopes such as 14C and 35S, and (or) artificially enriched stable isotopes including 15N-labelled fertilizers. More recently (2000–present), the scope of research widened to include natural-abundance stable isotope ratio studies as higher-sensitivity IRMS systems became more prevalent. Current isotope research topics include N biogeochemistry in natural and managed ecosystems, land management effects on greenhouse gas emissions, carbon cycling in northern landscapes, paleo-reconstruction in peatlands, carbon sequestration in boreal forests, and biodegradation of petroleum hydrocarbons. Further technological progress also enabled new techniques such as compound-specific IRMS analysis, including δ13C and δ2H measurements of soil n-alkanes and phospholipid fatty acids. In conclusion, current IRMS instrumentation presents unparalleled opportunities for multidisciplinary research to track carbon, plant nutrients, and pollutants as they move through soils.

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Dynamics of microbial biomass and soil fauna in two contrasting soils cropped to barley (Hordeum vulgare L.)

Rutherford

Juma

1989

Biol Fert Soils

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Factors affecting the distribution and dynamics of14C in two soils cropped to barley

Cited by 10 publications

References 25 publications

Spatial variation of soil quality indicators as a function of land use and topography

Spatial variation of soil quality indicators as a function of land use and topography

Isotope applications to soil science at the University of Alberta — an historical perspective

Dynamics of microbial biomass and soil fauna in two contrasting soils cropped to barley (Hordeum vulgare L.)

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