Abstract
Biofuels can be solid, liquid or gaseous and can be made from various biomass resources (or feedstocks). Biofuels produced today for the transportation sector are mainly made from oil crops (biodiesel) or sugar and starch crops (ethanol), of which many are annual crops. Future generation biofuels may use lignocellulosic biomass from trees and grasses, all perennial plants, as raw material.
The impact of biofuels on soil carbon (C) (i.e., soil organic carbon, SOC) depends on the characteristics of the crop, the management system and the previous land use. Soils under cultivation of annual crops such as sugar beet (Beta vulgaris), wheat (Triticum aestivum) and rapeseed (Brassica napus) experience a loss of soil C unless a system of reduced cultivation intensity is in place. Residues from annual crops, e.g., straw, can help to maintain soil C stocks if left in the field after harvest but are also deemed a low-cost resource for biofuels that does not require land for production. For corn (Zea mays), not more than 25 ;% of the residue biomass (corncobs) should be removed for energetic use if the soil C level is to be maintained. Under perennial crops soil carbon may accumulate at about 1 Mg C ha−1 annually.
Land-use change for bioenergy production has potentially the strongest impact of all management measures on soil C. In the most severe case of converting rainforest to oil palm (Elaeis guineensis) plantations for biodiesel production, it is estimated that about 25–170 Mg soil C are lost when the rainforest grows on mineral soil and more that 700 Mg C when the rainforest grows on peatland, the latter resulting in a carbon dioxide (CO2) emission payback time of more than 400 years. On the other hand, more than 10 Mg C ha−1 can be accumulated if imperata (Imperata cylindrica) grassland is converted to oil palm plantations.
It is concluded that depending on the type of cropping system under which biomass for biofuels is produced the effect on soil C can be positive (i.e., an increase or maintenance of soil C stocks) or negative (i.e., a decrease in soil C stocks). Positive effects can be expected where biomass is produced in perennial systems or where annual crops are grown in low-tillage intensity systems and not more than 25 % of the residue mass is removed. Strong negative effects can be expected where land-use changes result in a reduction of soil C.
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Abbreviations
- BtL:
-
biomass-to-liquid
- C:
-
carbon
- °C:
-
degrees Celsius
- CO2 :
-
carbon dioxide
- DME:
-
dimethyl ether
- FT:
-
Fischer Tropsch
- GHG:
-
greenhouse gases
- Ha:
-
hectare
- Mg:
-
mega gram (equivalent to metric ton)
- SOC:
-
soil organic carbon
- SRC:
-
short rotation coppice
- R&D:
-
Research and Development
- w/w:
-
weight by weight
- y:
-
year
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Acknowledgements
Illustration of plants by Uli Schmidt http://www.uli-schmidt-paintings.com/. Text edited by Nicole Gaudet.
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Lewandowski, I. (2013). Soil Carbon and Biofuels: Multifunctionality of Ecosystem Services. In: Lal, R., Lorenz, K., Hüttl, R., Schneider, B., von Braun, J. (eds) Ecosystem Services and Carbon Sequestration in the Biosphere. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6455-2_14
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