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1977~2008年中国森林生物量碳汇的时空变化

, PP. 421-431

Keywords: 森林,生物量碳库,碳汇,森林资源清查,中国

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Abstract:

森林在区域和全球碳循环中起着关键作用.研究中国森林生物量碳源汇变化对于估算区域碳收支和制定应对气候变化的森林管理政策有重要意义.利用1977~2008年间6期的森林资源清查资料,通过评估生物量碳库变化来估算中国森林生物量碳汇大小及其变化.森林按其用途和形态特征,分为林分、经济林和竹林三大类别.采用连续生物量转换因子法估算林分生物量碳库,平均生物量法估算经济林和竹林生物量碳库.结果显示,在1977~2008年间,中国森林生物量碳库累计增加(即生物量碳汇)1896TgC(1Tg=1012g),其中,林分、经济林和竹林分别增加1710,108和78TgC;年均生物量碳汇为70.2TgC/a,相当于抵消中国同期化石燃料排放CO2的7.8%.研究还表明,中国人工林的生物量碳库持续增加,生物量碳汇为818TgC,占林分总碳汇的47.8%;各龄级林分的生物量碳汇都有不同程度的增加:老龄林、中龄林和幼龄林分别增加930,391和388TgC.由于现阶段中国森林具有林龄小、平均碳密度低和人工林面积大的特点,因此未来中国森林生物量增汇潜力巨大.

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