气候变化研究进展 ›› 2013, Vol. 9 ›› Issue (3): 204-209.doi: 10.3969/j.issn.1673-1719.2013.03.008

• 温室气体排放 • 上一篇    下一篇

黔东南低效林改造碳汇潜力情景分析

张小全, 马剑   

  1. 美国大自然保护协会 中国部
  • 收稿日期:2012-11-22 修回日期:2012-12-19 出版日期:2013-05-30 发布日期:2013-05-30
  • 通讯作者: 张小全 E-mail:zxiaoquan@tnc.org

Scenario Analyses on the Carbon Sequestration Potential of Improving Management of Low-Value Forests in Southeast Guizhou Province

Zhang Xiaoquan, Ma Jian   

  1. The Nature Conservancy China Program
     
  • Received:2012-11-22 Revised:2012-12-19 Online:2013-05-30 Published:2013-05-30
  • Contact: Zhang Xiaoquan E-mail:zxiaoquan@tnc.org

摘要: 对黔东南以杉木和马尾松为主的低效林改造规划的案例分析表明,相对于维持现状的基线情景,低效林改造的碳汇效益的有无或大小取决于现有基线林分状况、低改措施以及林分的经营目的。如果以培育长周期大径材为目标,即项目期内无主伐,则将有明显的碳汇效益;但是,如果以短周期工业原料林或速生丰产林为经营目标,即项目期内发生一次或多次主伐,则碳汇效益十分有限,甚至相对基线情景,生物量中的长期碳储量将减少;择伐可大大提高低效林改造的碳汇效益。因此,要使低效林改造产生较大的净碳汇效益,甚至纳入碳交易,应尽可能避免短轮伐期;如果必须要主伐,也应尽可能采用择伐方式,以提高碳储量的长期平均水平。

关键词: 低效林改造, 碳汇潜力, 情景分析

Abstract: In the last 30 years, China has achieved a great success in the increase of both forest area and stocking volume. However, a large scale of low-value forests, in terms of timber yield and ecological services, have appeared all over China, mainly resulted from illegal logging, inappropriate choice of tree species for specific site conditions, insufficient unit investment for forestation, poor quality of seedlings and lack of effective tending and forest management, as well as frequent natural disasters. In recent years, Chinese government has initiated and enhanced the improvement of low-value forests including establishing financial incentive mechanism, and formulated a quantitative target in the Guidelines on the National Forest Plan (2010-2020). However, few studies on the carbon sequestration potential of the improving low-value forests have been conducted. Through scenario analysis on the case of improving low-value Chinese fir and masson pine forests implemented in Southeast Guizhou Province, we found that the carbon sequestration potential of improving low-value forests depends highly on existing state of low-value forests, measures for improvement to be taken and the management goals. For the purpose of long-term timber forests (without final harvest within 30 years), apparent net carbon credits are expected relative to the baseline scenario. However, for the purpose of short-term industrial material or fast-growth timber forest, the net carbon credits are very limited, with a long-term carbon stock in the tree biomass in some cases even lower than the baseline scenario. Selective harvest would largely increase the long-term carbon stock and result in apparent net carbon credits relative to the baseline scenario. We concluded that for the purpose of carbon sequestration, especially for the carbon offsetting, short-rotation should be avoided. Long-term rotation and selective harvest or no harvest are desired measures in order to increase the long-term carbon stock.

Key words: improving low-value forest, carbon sequestration potential, scenario case analysis

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