Composition of organic matter in a subtropical Acrisol as influenced by land use, cropping and N fertilization, assessed by CPMAS 13C NMR spectroscopy
12 pages, 5 figures, 4 tables, 34 references.
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Wiley-Blackwell
2005-12
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| Online Access: | http://hdl.handle.net/10261/82480 http://dx.doi.org/10.13039/501100003593 |
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dig-irnas-es-10261-824802018-09-12T11:50:34Z Composition of organic matter in a subtropical Acrisol as influenced by land use, cropping and N fertilization, assessed by CPMAS 13C NMR spectroscopy Dieckow, J. Mielniczuk, J. Knicker, Heike Bayer, C. Dick, D. P. Kögel-Knabner, I. Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil) 12 pages, 5 figures, 4 tables, 34 references. We know much about the influence of management on stocks of organic matter in subtropical soils, yet little about the influence on the chemical composition. We therefore studied by CPMAS 13C NMR spectroscopy the composition of the above-ground plant tissue, of the organic matter of the whole soil and of silt- and clay-size fractions of the topsoil and subsoil of a subtropical Acrisol under grass and arable crops. Soil samples were collected from three no-till cropping systems (bare soil; oats−maize; pigeon pea + maize), each receiving 0 and 180 kg N ha−1 year−1, in a long-term field experiment. Soil under the original native grass was also sampled. The kind of arable crops and grass affected the composition of the particulate organic matter. There were no differences in the composition of the organic matter in silt- and clay-size fractions, or of the whole soil, among the arable systems. Changes were observed between land use: the soil of the grassland had larger alkyl and smaller aromatic C contents than did the arable soil. The small size fractions contain microbial products, and we think that the compositional difference in silt- and clay-size fractions between grassland and the arable land was induced by changes in the soil's microbial community and therefore in the quality of its biochemical products. The application of N did not affect the composition of the above-ground plant tissue nor of the particulate organic matter and silt-size fractions, but it did increase the alkyl C content in the clay-size fraction. In the subsoil, the silt-size fraction of all treatments contained large contents of aromatic C. Microscopic investigation confirmed that this derived from particles of charred material. The composition of organic matter in this soil is affected by land use, but not by variations in the arable crops grown. CNPq for the fellowship awarded to Professor J. Mielniczuk, Professor C. Bayer and Professor D.P. Dick; FAPERGS for financially supporting the field experiment. Peer reviewed 2013-09-23T07:13:05Z 2013-09-23T07:13:05Z 2005-12 artículo http://purl.org/coar/resource_type/c_6501 European Journal of Soil Science 56 (6): 705–715 (2005) 1351-0754 http://hdl.handle.net/10261/82480 10.1111/j.1365-2389.2005.00705.x 1365-2389 http://dx.doi.org/10.13039/501100003593 en http://dx.doi.org/10.1111/j.1365-2389.2005.00705.x none Wiley-Blackwell |
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12 pages, 5 figures, 4 tables, 34 references. |
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil) |
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil) Dieckow, J. Mielniczuk, J. Knicker, Heike Bayer, C. Dick, D. P. Kögel-Knabner, I. |
| format |
artículo |
| author |
Dieckow, J. Mielniczuk, J. Knicker, Heike Bayer, C. Dick, D. P. Kögel-Knabner, I. |
| spellingShingle |
Dieckow, J. Mielniczuk, J. Knicker, Heike Bayer, C. Dick, D. P. Kögel-Knabner, I. Composition of organic matter in a subtropical Acrisol as influenced by land use, cropping and N fertilization, assessed by CPMAS 13C NMR spectroscopy |
| author_sort |
Dieckow, J. |
| title |
Composition of organic matter in a subtropical Acrisol as influenced by land use, cropping and N fertilization, assessed by CPMAS 13C NMR spectroscopy |
| title_short |
Composition of organic matter in a subtropical Acrisol as influenced by land use, cropping and N fertilization, assessed by CPMAS 13C NMR spectroscopy |
| title_full |
Composition of organic matter in a subtropical Acrisol as influenced by land use, cropping and N fertilization, assessed by CPMAS 13C NMR spectroscopy |
| title_fullStr |
Composition of organic matter in a subtropical Acrisol as influenced by land use, cropping and N fertilization, assessed by CPMAS 13C NMR spectroscopy |
| title_full_unstemmed |
Composition of organic matter in a subtropical Acrisol as influenced by land use, cropping and N fertilization, assessed by CPMAS 13C NMR spectroscopy |
| title_sort |
composition of organic matter in a subtropical acrisol as influenced by land use, cropping and n fertilization, assessed by cpmas 13c nmr spectroscopy |
| publisher |
Wiley-Blackwell |
| publishDate |
2005-12 |
| url |
http://hdl.handle.net/10261/82480 http://dx.doi.org/10.13039/501100003593 |
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