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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.)

Predicting soil C changes over sugarcane expansion in Brazil using the DayCent model

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Oliveira, Dener M. S. ; Williams, Stephen ; Cerri, Carlos E. P. ; Paustian, Keith
Total Authors: 4
Document type: Journal article
Source: Global Change Biology Bioenergy; v. 9, n. 9, p. 1436-1446, SEP 2017.
Web of Science Citations: 16

In recent years, the increase in Brazilian ethanol production has been based on expansion of sugarcane-cropped area, mainly by the land use change (LUC) pasture-sugarcane. However, second-generation (2G) cellulosic-derived ethanol supplies are likely to increase dramatically in the next years in Brazil. Both these management changes potentially affect soil C (SOC) changes and may have a significant impact on the greenhouse gases balance of Brazilian ethanol. To evaluate these impacts, we used the DayCent model to predict the influence of the LUC native vegetation (NV)-pasture (PA)-sugarcane (SG), as well as to evaluate the effect of different management practices (straw removal, no-tillage, and application of organic amendments) on long-term SOC changes in sugarcane areas in Brazil. The DayCent model estimated that the conversion of NV-PA caused SOC losses of 0.34 +/- 0.03 Mg ha(-1) yr(-1), while the conversion PA-SG resulted in SOC gains of 0.16 +/- 0.04 Mg ha(-1) yr(-1). Moreover, simulations showed SOC losses of 0.19 +/- 0.04 Mg ha(-1) yr(-1) in SG areas in Brazil with straw removal. However, our analysis suggested that adoption of some best management practices can mitigate these losses, highlighting the application of organic amendments (+0.14 +/- 0.03 Mg C ha(-1) yr(-1)). Based on the commitments made by Brazilian government in the UNFCCC, we estimated the ethanol production needed to meet the domestic demand by 2030. If the increase in ethanol production was based on the expansion of sugarcane area on degraded pasture land, the model predicted a SOC accretion of 144 Tg from 2020 to 2050, while increased ethanol production based on straw removal as a cellulosic feedstock was predicted to decrease SOC by 50 Tg over the same 30-year period. (AU)

Grantee:Dener Márcio da Silva Oliveira
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 14/08632-9 - Soil organic matter in land use change areas under sugarcane cultivation in south central region of Brazil
Grantee:Dener Márcio da Silva Oliveira
Support type: Scholarships in Brazil - Doctorate