Impacts of land use change due to biofuel crops on climate regulation services: Five case studies in Malawi, Mozambique and Swaziland
Impacts of land use change due to biofuel crops on climate regulation services: Five case studies in Malawi, Mozambique and Swaziland
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DOI：
10.1016/j.biombioe.2016.05.011
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发表时间：
2018-07-01
影响因子：
6
通讯作者：
Willis, Katherine J.
中科院分区：
文献类型：
--
作者：
Romeu-Dalmau, Carla;Gasparatos, Alexandros;Willis, Katherine J.
了解土地转换引起的碳固存变化是阐明生物燃料景观提供气候调节生态系统服务的真正潜力的关键。在这项研究中，我们专注于南部非洲最受欢迎的两种生物燃料作物，麻风树和甘蔗，以分析莫桑比克，马拉维和斯威士兰五个研究地点种植生物燃料作物的土地利用变化效应和相关的碳影响。我们发现，考虑到20年的周期，甘蔗地上生物量的碳储量高于麻风树。然而，由于土壤有机碳（SOC）通常是主要的碳库，总碳储量（考虑生物量和土壤）将高度依赖于SOC。我们的研究结果表明，在我们的研究地点，甘蔗取代土地利用与低碳储量（低密度森林和农业），并作为一个结果碳收益发生由于土地利用变化。在麻风树项目中，在小农计划中观察到碳收益，因为农业用地被转化为麻风树，但在麻风树种植园中出现碳债务，因为高密度森林被清除以种植这种原料。最后，我们表明，如果甘蔗或麻风树种植园被设想位于研究区域，那么更多的林地可能会转化为甘蔗（森林的30 - 44%）而不是麻风树（24-32%），而不会产生碳债务由于土地转换。据我们所知，这是对南部非洲主要生物燃料作物土地利用变化的碳影响的第一次比较研究。(C)2016爱思唯尔有限公司版权所有
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.