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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Spatial and temporal variability of soil CO2 emission in a sugarcane area under green and slash-and-burn managements

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Panosso, A. R. [1] ; Marques, Jr., J. [1] ; Pereira, G. T. [1] ; La Scala, Jr., N. [1]
Total Authors: 4
[1] FCAV UNESP, BR-14884900 Jaboticabal, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: SOIL & TILLAGE RESEARCH; v. 105, n. 2, p. 275-282, NOV 2009.
Web of Science Citations: 47

Soil management causes changes in physical, chemical, and biological properties that consequently affect soil CO(2) emission (FCO2). Here, we studied the soil carbon dynamics in areas with sugarcane production in southern Brazil under two different sugarcane management systems: green (G), consisting of mechanized harvesting that produces a large amount of crop residues left on the soil surface, and slash-and-burn (SB), in which the residues are burned before manual harvest, leaving no residues on the soil surface. The study was conducted during the period after harvest in two side-by-side grids installed in adjacent areas, having 60 points each. The aim was to characterize the temporal and spatial variability of FCO2, and its relation to soil temperature and soil moisture, in a red latosol (Oxisol) where G and SB management systems have been recently used. Mean FCO2 emission was 39% higher in the SB plot (2.87 mu mol m(-2) s(-1)) when compared to the G plot (2.06 mu mol m(-2) s(-1)) throughout the 70-day period after harvest. A quadratic equation of emissions versus soil moisture was able to explain 73% and 50% of temporal variability of FCO2 in SB and G, respectively. This seems to relate to the sensitivity of FCO2 to precipitation events, which caused a significant increase in SB emissions but not in G-managed area emissions. FCO2 semivariogram models were mostly exponential in both areas, ranging from 72.6 to 73.8 m and 63.0 to 64.7 m for G and SB, respectively. These results indicate that the G management system results in more homogeneous FCO2 when spatial and temporal variability are considered. The spatial variability analysis of soil temperature and soil moisture indicates that those parameters do not adequately explain the changes in spatial variability of FCO2, but emission maps are clearly more homogeneous after a drought period when no rain has occurred, in both sites. (C) 2009 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 08/58187-0 - Impact of management practices on soil CO2 emission in sugarcane production areas, Southern Brazil
Grantee:Newton La Scala Júnior
Support type: Research Program on Global Climate Change - Thematic Grants