| Title | Carbon stability in a texture contrast soil in response to depth and long-term phosphorus fertilisation of grazed pasture |
| Publication Type | Journal Article |
| Year of Publication | 2020 |
| Authors | Coonan E.C, Richardson A.E, Kirkby C.A, Macdonald L.M, Amidy M.R, Strong C.L, Kirkegaard J.A |
| Journal | Soil Research |
| Volume | 58 |
| Pagination | 21-34 |
| Type of Article | Article |
| ISBN Number | 1838-675X |
| Accession Number | WOS:000505188500002 |
| Keywords | ACCUMULATION, Agriculture, carbon fractions, density fractionation, fine fraction soil carbon, light-fraction, management, MECHANISMS, microbial communities, mid-infrared spectroscopy, nitrogen, nutrient stoichiometry, organic-matter turnover, soil carbon stocks, soil organic matter, stabilization, storage |
| Abstract | It is important to understand the stability of soil organic matter (SOM) sequestered through land management changes. In this study we assessed differences in carbon (C) stability of pasture soils that had high and low C content (2.35% vs 1.73% whole soil C in the 0-10 cm layer) resulting from long-term phosphorus fertilisation. We used soil size fractionation (fine fraction, coarse fraction and winnowing) to assess the amount of stable C and indicators of microbial decomposition capacity (catabolic profiles, metabolic quotient) to assess C stability. As a main effect throughout the 60-cm profile, C concentrations were higher in the fine fraction soil in the high (excess P fertiliser; P2) than low (no P fertiliser; P0) treatments, demonstrating a larger stable C fraction. For both P2 and P0, there was a strong correlation between C measured in the fine fraction and winnowed fraction in the 0-30 cm layer (R = 0.985, P 0.05). In addition, we conducted two incubation experiments to assess C stability in the treatments with depth and to assess C stability in the physical soil fractions. For the surface soils (0-10 cm), the highest respiration occurred in fractions containing plant material, including roots (coarse fraction, 0.65 g CO2-C kg(-1) soil; whole soil, 1.48 g CO2-C kg(-1) soil), which shows that the plant material was less stable than the fine and winnowed soil fractions (0.43 and 0.40 g CO2-C kg(-1) soil respectively). Soil respiration, microbial metabolic quotient and substrate utilisation were similar in P0 and P2. Collectively, the data show that the increased C in P2 was associated with increased C concentrations in the more stable fine soil fraction, but with no change in the stability of the C within the fractions.
|
| Short Title | Soil Res |
| Alternate Journal | Soil Res. |
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Coonan, Elizabeth C. Richardson, Alan E. Kirkby, Clive A. Macdonald, Lynne M. Amidy, Martin R. Strong, Craig L. Kirkegaard, John A.
Australian Government Research Training Program (RTP) ScholarshipAustralian GovernmentDepartment of Industry, Innovation and Science; Australian National University Dean's Merit Higher Degree Research Supplementary Scholarship in Science; CSIRO postgraduate scholarship
Elizabeth C. Coonan is supported by an Australian Government Research Training Program (RTP) Scholarship, an Australian National University Dean's Merit Higher Degree Research Supplementary Scholarship in Science and a CSIRO postgraduate scholarship. The authors thank Tony Swan and Melanie Bullock for assistance with the soil sampling for the incubation experiment, and Asta Hooge Poulsen for assistance with setting up the incubation experiment. The authors also thank Bounnaliam Thammavongsa, Nell Peisley and John Gouzos for assistance with soil nutrient analyses. Richard Simpson is thanked for his work in designing and maintaining the long-term Wallaroo P fertiliser experiment. Staff at CSIRO Ginninderra Experiment Station are thanked for their assistance in maintaining the long-term Wallaroo P fertiliser experiment and with soil sampling.
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