期刊
BIOMASS & BIOENERGY
卷 114, 期 -, 页码 30-40出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2016.05.011
关键词
Sugarcane; Jatropha; Southern Africa; Biofuel feedstock; Carbon sequestration; Ecosystem services
资金
- Ecosystem Services for Poverty Alleviation Program (ESPA) [NE/L001373/1]
- UK Department for International Development (DFID)
- Economic and Social Research Council (ESRC)
- Natural Environment Research Council (NERC)
- Natural Environment Research Council [NE/L001373/1, NE/M021351/1, ESPA-EIRG-2011-180] Funding Source: researchfish
- NERC [NE/M021351/1, ESPA-EIRG-2011-180, NE/L001373/1] Funding Source: UKRI
Understanding changes in carbon sequestration due to land conversion is key for elucidating the true potential of biofuel landscapes to provide climate regulation ecosystem services. In this study, we focus on the two most promoted biofuel crops in southern Africa, Jatropha and sugarcane, to analyse the land use change effects and associated carbon impacts of growing biofuel crops in five study sites in Mozambique, Malawi and Swaziland. We found that, considering a 20-year cycle, carbon stocks in aboveground biomass are higher for sugarcane than for Jatropha. However, as soil organic carbon (SOC) is generally the main carbon pool, total carbon stocks (considering biomass and soil) will highly depend on SOC. Our results show that, in our study sites, sugarcane replaced land uses with low carbon stocks (lowdensity forest and agriculture), and as a result carbon gains occurred due to land use change. In the Jatropha projects, carbon gains are observed in the smallholder scheme as agricultural land was converted to Jatropha, but carbon debts occurred in the Jatropha plantation as high-density forest was cleared to grow this feedstock. Finally we show that, if a plantation of sugarcane or Jatropha is envisioned to be located in the studied regions, more forested land could potentially be converted into sugarcane (30 -44% of forest) than into Jatropha (24-32%), without creating carbon debts due to land conversion. To our knowledge, this is the first comparative study of the carbon impacts of land use change of the main biofuel crops in southern Africa. (C) 2016 Elsevier Ltd. All rights reserved.
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