INVESTIGADORES
ECHARTE Laura
artículos
Título:
Sequestration of native soil organic carbon and residue carbon in complex agroecosystems
Autor/es:
BICHEL, A., ; OELBERMANN, M., ; VORONEY, R.P.,; ECHARTE, L
Revista:
Carbon Management
Editorial:
Taylor & Francis
Referencias:
Año: 2016 vol. 7 p. 261 - 270
Resumen:
Knowingshort-term gains and losses of soil organic carbon (SOC) is crucial forunderstandingtherole of different land management practices in climate change mitigation. Thisstudyevaluatedthe flowof carbon (C) in soil from two differently configured intercrops [1:2 (one rowofmaize and two rows soybean); 2:3 (two rows of maize and three rows of soybean)]comparedtoa maize and soybean sole crop as a result of residue addition. Addition ofsoybean or maizeresiduessignificantlyincreased (p < 0.05) SOC, light fraction (LF-C), and soil microbial biomass(SMB).Soil organic C from native sources was significantly greater (p < 0.05) than C from new(residue)sources. The LF had a significantly greater (p < 0.05) C content from new sources.Treatmentsamended with soybean residue had a significantly greater (p < 0.05) contributionfromnew C sources for SOC and LF than treatments amended with maize residue. TheSMB-Cwassignificantlygreater (p < 0.05) in the 2:3 intercrop. Cumulative soil CO2 emission wassignificantly lower (p < 0.05) in intercrops than in sole crops. CO2 emissions derived from newCsources was significantlygreater (p < 0.05) than that derived from native sources in maizeamendedtreatments; and not significantlydifferent (p < 0.05) for treatments amended withsoybeanresidues.