Distribution and vertical stratification of carbon and nitrogen in soil under different managements in the Pampean region of Argentina
One of the expected benefits of no-tillage systems is a higher rate of soil C sequestration. However, higher C retention in soil is not always apparent when notillage is applied, due e.g., to substantial differences in soil type and initial C content. The main purpose of this study was to evaluate t...
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| Formato: | Artículo |
| Lenguaje: | Español |
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| Acceso en línea: | http://ri.agro.uba.ar/files/download/articulo/2011alvarez.pdf LINK AL EDITOR |
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| 245 | 1 | 0 | |a Distribution and vertical stratification of carbon and nitrogen in soil under different managements in the Pampean region of Argentina |
| 246 | 0 | 0 | |a Distribuição e estratificação vertical do carbono e nitrogênio em solos sob diferentes manejos na região do Pampa Argentino |
| 520 | |a One of the expected benefits of no-tillage systems is a higher rate of soil C sequestration. However, higher C retention in soil is not always apparent when notillage is applied, due e.g., to substantial differences in soil type and initial C content. The main purpose of this study was to evaluate the potential of no-tillage management to increase the stock of total organic C in soils of the Pampas region in Argentina. Forty crop fields under no-tillage and conventional tillage systems and seven undisturbed soils were sampled. Total organic C, total N, their fractions and stratification ratios and the C storage capacity of the soils under different managements were assessed in samples to a depth of 30 cm, in three layers [0-5, 5-15 and 15-30 cm]. The differences between the C pools of the undisturbed and cultivated soils were significant [p less than 0.05] and most pronounced in the top [0-5 cm] soil layer, with more active C near the soil surface [undisturbed greater than no-tillage greater than conventional tillage]. Based on the stratification ratio of the labile C pool [0-5/5-15 cm], the untilled were separated from conventionally tilled areas. Much of the variation in potentially mineralizable C was explained by this active C fraction [R 2 = 0.61] and by total organic C [R 2 = 0.67]. No-till soils did not accumulate more organic C than conventionally tilled soils in the 0-30 cm layer, but there was substantial stratification of total and active C pools at no till sites. If the C stratification ratio is really an indicator of soil quality, then the C storage potential of no-tillage would be greater than in conventional tillage, at least in the surface layers. Particulate organic C and potentially mineralizable C may be useful to evaluate variations in topsoil organic matter. | ||
| 650 | |2 Agrovoc |9 26 | ||
| 653 | 0 | |a C AND N STOCKS | |
| 653 | 0 | |a CARBON STRATIFICATION | |
| 653 | 0 | |a NO-TILLAGE | |
| 653 | 0 | |a SOIL ORGANIC MATTER FRACTIONS | |
| 653 | 0 | |a TILLAGE SYSTEMS | |
| 700 | 1 | |9 7471 |a Alvarez, Carina Rosa | |
| 700 | 1 | |9 7396 |a Costantini, Alejandro Oscar | |
| 700 | 1 | |a Bono, Angel Alfredo |9 16055 | |
| 700 | 1 | |a Taboada, Miguel Angel |9 9839 | |
| 700 | 1 | |9 6387 |a Gutiérrez Boem, Flavio Hernán | |
| 700 | 1 | |9 33912 |a Fernández, Patricia Lilia | |
| 700 | 1 | |9 9214 |a Prystupa, Pablo | |
| 773 | |t Revista Brasileira de Ciencia do Solo |g vol.35, no.6 (2011, p.1985-1994 | ||
| 856 | |u http://ri.agro.uba.ar/files/download/articulo/2011alvarez.pdf |i En internet |q application/pdf |f 2011alvarez |x MIGRADOS2018 | ||
| 856 | |u http://www.sbcs.org.br/en/ |x MIGRADOS2018 |z LINK AL EDITOR | ||
| 942 | 0 | 0 | |c ARTICULO |
| 942 | 0 | 0 | |c ENLINEA |
| 976 | |a AAG | ||