不同国家木质林产品碳流动对比

木质林产品碳流动对维持森林生态系统和大气之间的自然碳平衡发挥着重要作用,为支持中国参加气候变化谈判,亟须掌握主要缔约国木质林产品的碳流动及其变化。分别采用政府间气候变化专门委员会(IPCC)缺省法、储量变化法、生产法和大气流动法等方法估算了包括中国在内的11个国家木质林产品的碳排放和碳储量,以及不同转化因子对其碳储量变化的影响。结果表明:美国、中国、巴西和加拿大等4个国家木质林产品的碳排放和碳储量结果均较高,中国的木质林产品是一个不断增长的碳库;采用的计量方法不同也将导致结果差异,储量变化法和生产法估算日本产品是一个碳库,但大气流动法的结果却相反;此外不同的转化因子将造成碳储量变化的结果差异。

International comparison of carbon flows of harvested wood products

Carbon flow of harvested wood products （HWP） plays a very important role to maintain the natural carbon balance between forest and atmosphere. To facilitate China’s participation in the climate change negotiation，it is important to understand the carbon flows and the changes of HWP in the countries involved. Through the Intergovernmental Panel on Climate Change （IPCC） default approach，the stock change approach，the production approach, and the atmospheric flow approach，this paper analyzed the data on carbon emission and stock of HWP in eleven countries including China，and the influence of different conversion factors on carbon stock change. The results showed that carbon emission and stock of HWP in the United States， China, Brazil and Canada were higher than those in other countries. The wood products in China were a carbon pool. Different approaches would lead to different results. Both the stock change approach and production approach indicated that HWP in Japan was a carbon pool，however，the atmospheric flow approach indicated the opposite conclusion. Different conversion factors would affect the measure results of carbon stock change. ［Ch，3 fig. 1 tab. 23 ref.］