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|Title: ||Stratification ratio of organic matter pools influenced by management systems in a weathered Oxisol from a tropical agro-ecoregion in Brazil|
|???metadata.dc.creator???: ||Figueiredo, C. C.|
Resck, D. V. S.
Carneiro, Marco Aurélio Carbone
Ramos, M. L. G.
Sá, J. C. M.
Soil microbial biomass
|Publisher: ||Universidade Federal de Lavras|
|Issue Date: ||1-Mar-2013|
|Citation: ||FIGUEIREDO, C. C. et al. Stratification ratio of organic matter pools influenced by management systems in a weathered Oxisol from a tropical agro-ecoregion in Brazil. Australian Journal of Soil Research, Melbourne, v. 51, p. 133-141, 2013.|
|Abstract: ||Enhancement of organic matter plays an essential role in improving soil quality for supporting sustainable food
production. Changes in carbon stocks with impacts on emissions of greenhouse gases may result from the stratification of
organic matter as a result of soil use. The objective of this study was to evaluate the impact of soil management systems on
soil carbon stocks and stratification ratios (SR) of soil organic matter pools. Total organic carbon (TOC), particulate organic
carbon (POC), mineral-associated organic carbon, microbial biomass carbon (MBC) and nitrogen, basal respiration, and
particulate organic matter nitrogen (PON) were determined. The field experiment comprised several tillage treatments:
conventional tillage, no-till with biannual rotation, no-till with biannual rotation combined with a second crop, no-till with
annual rotation, and pasture. The labile fractions indicated a high level of variation among management systems. Pasture
proved to be an excellent option for the improvement of soil carbon. While the conventional tillage system reduced total
carbon stocks of the soil (0–40 cm), no-tillage presented TOC stocks similar to that of native vegetation. Sensitivity of the
TOC SR varied from 0.93 to 1.28, a range of 0.35; the range for POC was 1.76 and for MBC 1.64. The results support the
hypothesis that the labile fractions (POC, MBC, and PON) are highly sensitive to the dynamics of organic matter in highly
weathered soils of tropical regions influenced by different management systems. Reductions to SRs of labile organic matter
pools are related to the impacts of agricultural use of Cerrado soils|
|Appears in Collections:||DCS - Artigos publicados em periódicos|
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