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为了探明华北落叶松(Larix gmelinii var.principis-rupprechtii)人工林的碳循环过程,该研究以河北围场地区的华北落叶松人工林为例,基于CO2FIX模型,以在当地的实际调查数据、文献数据作为输入数据,从生物量、土壤和木质林产品碳库3个方面探讨了华北落叶松人工林的碳循环过程和碳汇能力。结果表明:华北落叶松人工林土壤碳库最大,生物量碳库次之,林产品碳库最小,但是林产品碳库随时间呈逐渐增加的趋势;在一个轮伐期内(50年),每公顷华北落叶松人工林约固定了250t碳,其中约70%通过凋落物和采伐剩余物的方式进入土壤碳库,约30%进入木质林产品碳库;华北落叶松人工林在生长的大部分时间是一个碳的吸收汇,而在森林采伐时成为暂时的排放源,从长时间尺度上看,每公顷华北落叶松人工林每年大约固定0.3 t左右的碳。该研究结果表明了木质林产品碳库在人工林碳循环中的重要作用,这将有助于更加全面地认识人工林的碳循环过程和碳汇能力。
In order to explore the carbon cycle of Larix gmelinii var. Principis-rupprechtii plantations, this study took the Larix principis-rupprechtii plantation in Hebei paddy field as an example. Based on the CO2FIX model and the actual survey data in the local area, Data as input data, the carbon cycle and carbon sequestration of Larix principis-rupprechtii plantation were discussed from three aspects of biomass, soil and carbon pool of woody products. The results showed that: Larix principis-rupprechtii plantation had the highest soil carbon pool, followed by biomass carbon pool and the smallest forest plant carbon pool, but the carbon stocks of forest products tended to increase with time. During a rotation period (50 years) About 50% carbon dioxide per hectare plantation was fixed in the Larix principis-rupprechtii plantation, about 70% of which entered the soil carbon pool through litter and harvesting residues, and about 30% entered the carbon pool of woody products. Larix principis-rupprechtii Part of the time is a carbon sink and becomes a temporary source of emissions during deforestation. On a long-term scale, annual Larix principis-rupprechtii plantation per hectare is fixed at about 0.3 t carbon. The results of this study demonstrate the important role of the carbon pool of woody products in the carbon cycle of plantations, which will help to more fully understand the carbon cycle and carbon sequestration of plantations.