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土壤有机碳在可持续森林生产力的维持中起重要作用。本文以北京鹫峰地区栓皮栎林和油松林为研究对象,对土壤有机碳及其组分的含量与密度进行了研究。结果表明,在0~20 cm土层中,栓皮栎林土壤总有机碳、轻组有机碳和易氧化碳的含量分别达到14.05 g kg-1、2.97 g kg-1和0.38 g kg-1,显著高于油松林。栓皮栎林0~20 cm土层内土壤颗粒有机碳、轻组有机碳和易氧化碳密度分别较油松林高39.68%、77.77%、145.45%,两植被类型间的的差异均达到了显著水平。在土壤总有机碳中,颗粒有机碳、轻组有机碳和易氧化碳的分配比例分别为23.60%~41.40%、9.10%~33.33%和1.39%~2.80%。因此,栓皮栎林较油松林更有利于土壤总有机碳和活性有机碳的积累。
Soil organic carbon plays an important role in the maintenance of sustainable forest productivity. In this paper, the Quercus variabilis forest and Pinus tabulaeformis forest in Jiufeng, Beijing were studied to study the content and density of soil organic carbon and its components. The results showed that soil total organic carbon, light organic carbon and readily oxidizable carbon content in the soil layer of 0 ~ 20 cm were 14.05 g kg-1, 2.97 g kg-1 and 0.38 g kg-1, respectively, Significantly higher than the pine forest. The density of soil organic carbon, light organic carbon and readily oxidizable carbon in 0 ~ 20 cm soil layer of Pinus tabulaeformis forest was 39.68%, 77.77% and 145.45% higher than that of Pinus tabulaeformis forest respectively. The differences among the two vegetation types reached the significant level . Among the total soil organic carbon, the proportions of particulate organic carbon, light organic carbon and easily oxidizable carbon were 23.60% ~ 41.40%, 9.10% ~ 33.33% and 1.39% ~ 2.80%, respectively. Therefore, Quercus variabilis forest is more favorable to the accumulation of soil total organic carbon and active organic carbon than Pinus tabulaeformis forest.