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| DOI: | 10.2136/sssaj2012.0333 |
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| Web URL(s): | https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2012.0333
Last checked: 02/26/2024
Access conditions: Item is within a limited-access website
Notes: Abstract only
https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2012.0333
Last checked: 02/26/2024
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Mudge, P. L.;
Schipper, L. A.;
Ghani, A.;
Upsdell, M.;
Baisden, W. T. |
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| Author Affiliation: | Mudge and Schipper: Department of Earth and Ocean Sciences, University of Waikato, Hamilton, NZ; Mudge, Ghani and Upsdell: AgResearch Ruakura Research Centre, Hamilton, NZ; Mudge: Landcare Research, Hamilton, NZ; Baisden: National Isotope Center, GNS Science, Lower Hutt, NZ |
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| Title: | Changes in natural 15N abundance in pastoral soils receiving differing amounts of superphosphate fertilizer and irrigation for 50 years |
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| Section: | Soil biology & biochemistry
Other records with the "Soil biology & biochemistry" Section
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| Source: | Soil Science Society of America Journal. Vol. 77, No. 3, May 2013, p. 830-841. |
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| Publishing Information: | Madison, Wisconsin: Soil Science Society of America |
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| # of Pages: | 12 |
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| Keywords: | TIC Keywords: Cultural methods; Fertilization; Irrigation frequency; Isotopes; Nitrogen cycle; Nitrogen losses; Pasture soils; Superphosphates
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| Abstract/Contents: | "Intensification of pastoral agriculture has led to increased N losses to the wider environment. This has led to an emphasis on improving our understanding of soil N dynamics, and development of management practices which mitigate N losses. The natural abundance of the stable isotope 15N relative to 14N (δ15N) in soils can provide an integrated measure of past N cycle processes, and in particular soil δ15N can reflect past N losses, because during most N transformation processes 14N is preferentially lost. We therefore hypothesized that pastoral soils under intensive management regimes (with high N inputs, cycling, and loss) would become progressively enriched with 15N relative to soils under less intensive management. To test this hypothesis we analyzed archived surface soils from two long-term grazed field trials in New Zealand, where different rates of irrigation and superphosphate fertilizer had been applied for ~50 yr. In all treatments except one (a control treatment receiving no fertilizer), δ15N increased with time and the increase was greater in treatments receiving more superphosphate or irrigation (average increases ranged from ~0.015-0.034 % yr-1). Pasture production and grazing intensity also increased with increasing fertilizer rate and irrigation frequency, and we found positive correlations between the average rate of change in soil δ15N, and total pasture production (r2 = 0.77, p = 0.02), clover production (r2 = 0.95, p < 0.001), and calculated N losses (r2 = 0.98, p < 0.001) over ~50 yr. We suggest that most of the difference in δ15N observed between treatments was due to the influence fertilizer and irrigation had on pasture production, and the resulting effects this had on isotope fractionating N loss processes. Soil δ15N could therefore be a useful indicator of past management intensity and N cycling and loss from pastoral systems." |
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| Language: | English |
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| References: | 77 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Mudge, P. L., L. A. Schipper, A. Ghani, M. Upsdell, and W. T. Baisden. 2013. Changes in natural 15N abundance in pastoral soils receiving differing amounts of superphosphate fertilizer and irrigation for 50 years. Soil Science Society of America Journal. 77(3):p. 830-841. |
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| DOI: 10.2136/sssaj2012.0333 |
| Web URL(s):
https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2012.0333
Last checked: 02/26/2024
Access conditions: Item is within a limited-access website
Notes: Abstract only
https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2012.0333
Last checked: 02/26/2024
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: b2199342a |
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