黑碳在杉木人工林土壤不同组分中的分配规律研究

黑碳(BC)是土壤惰性 C 库的重要组分,在土壤 C 循环中占有重要地位.本文利用相对密度分组方法研究BC在杉木人工林土壤不同组分中的分配规律.结果表明:杉木人工林土壤轻组分中黑碳(LFBC)含量为 0.05 ～ 0.64 g/kg,而重组分中黑碳(HFBC)含量为 0.23 ～ 1.09 g/kg.LFBC/BC的比例为 12.9% ～ 37.5%,HFBC/BC的比例为62.5% ～ 87.1%,表明 BC 主要存在重组分中.但是,LFBC含量占轻组有机碳(LFOC)含量的比例(LFBC/LFOC)为4.0% ～ 27.9%,而HFBC含量占重组有机碳(HFOC)含量的比例(HFBC/HFOC)仅为 6.5% ～ 8.9%,前者比例大多高于后者,说明轻组分中不仅存在 BC,而且 BC 占该组分 C 库的比例较高.

Distribution of black carbon from soil different fractions in Chinese fir plantation

Black carbon (BC), an important component in the inert carbon pool of soils, represents an appreciable sink of carbon in the global carbon cycle. The objective of this study was to investigate the distribution of BC from soil fractions in Chinese fir plantation. The results indicated that the contents of BC in light fraction (LFBC) and heavy fraction (HFBC) ranged from 0.05 to 0.64 g/kg and 0.23 to 1.09 g/kg respectively. The proportion of LFBC to BC varied from 12.9% to 37.5%, whereas that of HFBC to BC ranged between 62.5% and 87.1%, which indicated that the BC was mainly present in the heavy fraction. However, the LFBC/LFOC and HFBC/HFOC ratios were 4.0% ~ 27.9% and 6.5% ~ 8.9% respectively, which indicated that BC was an important constituent of C pool in light fraction.