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复林项目的成本决定了它们与其它减轻大气中日益增加的CO_2浓度的方法的竞争力。我们量化了南美两国——厄瓜多尔和阿根廷——人工林和次生林地上生物量和土壤中的碳获取量,并计算了短期碳获取成本。每短期认证减排单位成本为0.1～2.7美元/MgCO_2,主要取决于机会成本、立地适宜性、贴现率和认证成本。在厄瓜多尔,次生林是一种可行并合算的方法;在阿根廷,在适宜性高的土地上进行复林相对便宜一些。我们的研究结果可用于设计有成本效益的CO_2汇项目和为土地所有者协商公平的碳价格。
The costs of reforestation projects determine their competitiveness with other approaches that reduce the concentration of CO 2 in the atmosphere. We quantified biomass and soil available carbon in plantations and secondary forests in South America and the United States - Ecuador and Argentina - and calculated short-term carbon acquisition costs. The unit cost of CERs per short-term certification is 0.1 ~ 2.7 US $ / MgCO 2, depending on the opportunity cost, site suitability, discount rate and certification cost. In Ecuador, secondary forest is a viable and cost-effective method; in Argentina, it is relatively cheaper to rehabilitate land on highly suitable land. Our findings can be used to design cost-effective CO 2 sink projects and negotiate fair carbon prices for landowners.