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土壤黑碳由于具有生物化学惰性被视为土壤稳定碳库的主要成分.本文量化了大兴安岭中段森林土壤黑碳,分析了黑碳在各粒级内的分布,并探讨了黑碳的稳定机制及其在土壤碳库中的重要性.结果表明:土壤黑碳表聚现象明显,表层黑碳占总剖面(64 cm)的68.7%,随着土层加深黑碳含量显著降低,但黑碳占有机碳的比例却呈现上升趋势.气候条件影响大兴安岭地区土壤黑碳的分布,相对寒冷和湿润的气候条件提高了土壤固持黑碳的潜力;土壤黑碳在各粒级内所占比例表现为黏粒>粉粒>细砂>粗砂,尽管黏粒中黑碳含量最高,并随土层深度增加而升高,但黏粒中黑碳占有机碳的比例却无明显变化,黑碳/有机碳的升高主要源于细砂与粉粒中黑碳的增加;黑碳的生物化学惰性是表层黑碳的主要稳定机制,而深层的黑碳除了其自身抗性外,黏粒矿物的化学保护发挥着重要作用;黑碳不仅作为稳定碳库的主要成分,在颗粒有机碳组分中仍占相当大的比例,因此黑碳的存在提高了土壤稳定性碳储量与碳汇能力.
Soil black carbon is regarded as the main component of soil stable carbon pool due to its biochemical inertness.This paper quantifies the distribution of black carbon in forest soil black carbon in the middle section of Daxinganling and analyzes the stability mechanism of black carbon And its importance in the soil carbon pool.The results showed that the phenomenon of black carbon aggregates was obvious in the soil, the surface black carbon accounted for 68.7% of the total profile (64 cm), and the content of black carbon decreased significantly with the deepening of the soil layer The proportion of carbon in the soil showed an upward trend.The climatic conditions affected the distribution of soil black carbon in the Greater Hinggan Mountains and the relative cold and humid climatic conditions increased the potential of soil to retain black carbon.The percentage of soil black carbon in each grain was Granules> silt> fine sand> coarse sand, though the content of black carbon in clay is the highest and increases with the depth of soil, the ratio of black carbon to organic carbon in clay does not change significantly. The increase of carbon was mainly attributed to the increase of black carbon in the fine sand and silt; the biochemical inertness of black carbon was the main stable mechanism of surface black carbon, while the deep black carbon addition to its own resistance, the chemistry of clay minerals Protection plays an important role; black carbon is not only Stable carbon as a main component of the library, still a substantial proportion of particulate organic carbon component, there is black carbon increases the carbon storage stability and soil carbon sequestration ability.