Glomalin contribution to soil organic carbon under different pasture managements in a saline soil environment
The glomalin produced by arbuscular mycorrhizal fungi has beneficial effects on soils. We studied the vertical profile of glomalin-related soil protein (GRSP) in pasturelands grown under saline soils and exposed to different management practices. Treatments included haying and grazing of Chloris gayana subject to either N-fertilization or not. We measured mycorrhizal colonization, spores, root biomass, total GRSP, GRSP-carbon (GRSP-C), organic carbon (OC) and total nitrogen (TN). In the meanwhile, we also developed a mathematical procedure to fit continuous power functions to binned soil data. Power decay functions adjusted excellently well the measured data across the 1-meter soil profile. Meaningful increases of root biomass, OC, TN, GRSP and GRSP-C values were associated with grazing and fertilization. Particularly, GRSP-C averaged 1,134 kg C ha−1 at the beginning experiments and increased significantly up to 1,261 kg C ha−1 in grazed and fertilized pastures at the end of the study period. Carbon accounted for between 17% and 50% of GRSP, representing in turn 0.52–1.62% of SOC stock. So, a tropical perennial grass can contribute to the carbon stock in saline soils by promoting production of GRSP. This contribution increases when inputs and cycling of nutrients are enhanced (grazing and N-fertilization).
| Main Authors: | , , , , |
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| Format: | info:ar-repo/semantics/artículo biblioteca |
| Language: | eng |
| Published: |
Taylor & Francis
2020-10-23
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| Subjects: | Chloris Gayana, Suelo Salino, Grasses, Saline Soils, Soil Organic Carbon, Grassland Management, Gramíneas, Carbono Orgánico del Suelo, Manejo de Praderas, Total Glomalin, Glomalin-Carbon Content, Tropical Perennial-Grasses, |
| Online Access: | http://hdl.handle.net/20.500.12123/10621 https://www.tandfonline.com/doi/full/10.1080/03650340.2020.1834536 https://doi.org/10.1080/03650340.2020.1834536 |
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