Fecha/hora: 13/06/2024 15:30:49

Biblioteca(s): | INIA La Estanzuela.
Tipo de la producción científica: | Artículos en Revistas Indexadas Internacionales
Circulación/Nivel: | Internacional - --
Fecha corriente: | 15/03/2022
Fecha de la última actualización: | 15/03/2022
Autoria: | NÚÑEZ, A.; COTRUFO, M.F.; SCHIPANSKI, M.
Afiliación: | AGUSTIN NUÑEZ RUSSI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay./ Department of Soil and Crop Sciences, Colorado State University, 307 University Ave., Fort Collins, CO 80523-1170, USA.; M. FRANCESCA COTRUFO, Department of Soil and Crop Sciences, Colorado State University, 307 University Ave., Fort Collins, CO 80523-1170, USA.; MEAGAN SCHIPANSKI, Department of Soil and Crop Sciences, Colorado State University, 307 University Ave., Fort Collins, CO 80523-1170, USA.
Título: | Irrigation effects on the formation of soil organic matter from aboveground plant litter inputs in semiarid agricultural systems.
Año de publicación: | 2022
Fuente/Imprenta: | Geoderma, 2022, Volume 416, Article number 115804. doi: https://doi.org/10.1016/j.geoderma.2022.115804
DOI: | 10.1016/j.geoderma.2022.115804
Idioma: | Inglés
Notas: | Article history: Received 28 October 2021/ Revised 25 February 2022/ Accepted 25 February 2022/ Available online 7 March 2022 /Version of Record 7 March 2022.

Contenido:

ABSTRACT: In semiarid agricultural systems, irrigation may increase soil organic matter (SOM) due to higher biomass 
production. However, aboveground production tends to increase more than belowground biomass, and in no-till 
systems SOM responses to irrigation would strongly depend on the fate of crop residues left on the soil surface. 
Litter decomposition and SOM formation can also be affected by irrigation due to changes in water dynamics, but 
little is known about the impacts of irrigation on the pathways of SOM formation. We used dual 13C and 15N 
labeled maize litter to quantify the effect of irrigation on the contribution of aboveground crop residues to SOM 
formation in semiarid, no-till agricultural systems. We incubated the litter in a continuous maize cropping system 
with two treatments, dryland and irrigated, and measured litter decomposition and its contribution to different 
SOM pools. Irrigation had a larger effect on litter C and N losses than on the formation of new SOM. After 13 
months the C and N losses from the litter layer were 24% higher under irrigation, but there were no treatment 
differences in the litter-derived C and N recovered in SOM. Most of the litter-derived organic matter (OM) was 
found in the mineral associated OM pool (MAOM), but irrigation did not affect the amount of litter-derived OM 
found as MAOM or as particulate organic matter. Irrigation increased the amount of litter-derived OM found in 
macroaggregates, and this observation was more related to a higher aggregation than to aggregate enrichment in 
the irrigated treatment. Our results suggest that a smaller proportion of aboveground crop residues will form 
SOM in irrigated systems compared to dryland conditions and may help to partially explain why irrigation has a 
stronger relative effect on crop productivity and C inputs than on SOC stocks in semiarid agricultural systems.

Palabras-Clave: | 13C; 15N; Aggregates; Litter decomposition; Physical fractionation; Table isotopes.
Categoría del tema: | --
Registro original: | INIA La Estanzuela (LE)
Ejemplares: | LE - (103499-1) - PXI - AP - DD - PP/Geoderma, 2022 -  -  - DIS