Olsson Lennart, Ardö Jonas
Centre for Environmental Studies, Lund University, Box 170, SE-221 00 Lund, Sweden.
Ambio. 2002 Sep;31(6):471-7. doi: 10.1579/0044-7447-31.6.471.
The Kyoto Protocol opens new possibilities for using the biosphere as a carbon sink. Using agro-ecosystems as carbon sinks may be the most appropriate practice from both environmental and socioeconomic points of view. Degraded agro-ecosystems in Africa might benefit significantly from the improved land management that would be part of a carbon sequestration program. There are vast areas of these agro-ecosystems in Africa and their rehabilitation is an urgent matter. We agree with UNEP that there are potentially important synergies to be made between the Convention on Climate Change, the UN Convention to Combat Desertification and the UN Convention on Biodiversity. In this paper, we have investigated the potential for increasing soil carbon content in semiarid agro-ecosystems in the Sudan and found that increasing fallow periods will result in increased soil carbon content and converting marginal agricultural areas to rangeland will restore the carbon levels to 80% of the natural savannah carbon levels in 100 years. The economic gain from a future carbon sequestration program has the potential of a significant contribution to the household economy in these agro-ecosystems.
《京都议定书》为将生物圈用作碳汇开辟了新的可能性。从环境和社会经济角度来看，将农业生态系统用作碳汇或许是最为恰当的做法。非洲退化的农业生态系统可能会从作为碳固存计划一部分的土地管理改善措施中大幅受益。非洲有大片这样的农业生态系统，对其进行恢复是当务之急。我们赞同联合国环境规划署的观点，即《气候变化公约》《联合国防治荒漠化公约》和《生物多样性公约》之间有可能产生重要的协同效应。在本文中，我们研究了苏丹半干旱农业生态系统中增加土壤碳含量的潜力，发现延长休耕期将导致土壤碳含量增加，并且将边际农业地区转变为牧场将在100年内使碳水平恢复到天然稀树草原碳水平的80%。未来碳固存计划带来的经济收益有可能对这些农业生态系统中的家庭经济做出重大贡献。
