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首页> 外文期刊>Bioenergy research >Effects of Forest Management on Total Biomass Production and CO2 Emissions from use of Energy Biomass of Norway Spruce and Scots Pine
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Effects of Forest Management on Total Biomass Production and CO2 Emissions from use of Energy Biomass of Norway Spruce and Scots Pine

机译：森林经营对挪威云杉和樟子松能源生物量利用对总生物量生产和CO2排放的影响

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The aim of this study was to analyze the effects of forest management on the total biomass production (t ha-1a-1) and CO2 emissions (kg CO2 MWh-1) from use of energy biomass of Norway spruce and Scots pine grown on a medium fertile site. In this context, the growth of both species was simulated using an ecosystem model (SIMA) under different management regimes, including various thinning and fertilization treatments over rotation lengths from 40 to 120 years in different pre-commercial stand densities. A Life Cycle Analysis/Emission calculation tool was employed to assess the CO2 emissions per unit of energy from the use of biomass in energy production. Furthermore, the overall balance between the CO2 uptake and emission (carbon balance) was studied, and the carbon neutrality (CN) factor was calculated to assess environmental effects of the use of biomass in energy production; i.e., how much CO2 would be emitted per unit of energy when considering direct and indirect emissions from forest ecosystem and energy production. In general, the total annual biomass production for both species was highest when management with fertilization and high pre-commercial stand density (4000鈥?000 trees ha-1) was used. In the case of Norway spruce, the highest annual biomass production was obtained with a rotation length of 80鈥?00 years, while for Scots pine a rotation length of 40鈥?0 years gave the highest annual production. In general, the CO2 emissions decreased along with an increasing rotation length. The reduction was especially large if the rotation length was increased from 40 years to 60 years. Scots pine produced remarkably smaller net CO2 emissions per year (on average 29%) than Norway spruce over all different densities and rotation lengths. The value of the CN factor was highest if a rotation of 100 years was used for Norway spruce stands and a rotation of 120 years for Scots pine. The CO2 emission per energy unit was substantially less than that from the use of coal, which was used as reference to assess environmental effects of the use of biomass in energy production. The use of higher density of pre-commercial stand than that currently recommended in the Finnish forestry, together with timely thinning and fertilization, could increase the total biomass production, but also simultaneously decrease the net CO2 emissions from the use of energy wood.
机译：这项研究的目的是分析森林管理对挪威云杉和苏格兰松树上生长的能源生物量的能源生物量利用对总生物量产量（t ha-1a-1）和CO2排放量（kg CO2 MWh-1）的影响。中等肥沃的地方。在这种情况下，使用生态系统模型（SIMA）在不同的管理制度下模拟了这两种物种的生长，包括在不同商业前林分密度下，自40至120年的轮作期进行了各种间伐和施肥处理。使用生命周期分析/排放量计算工具评估了在能源生产中使用生物质产生的每单位能源的二氧化碳排放量。此外，研究了二氧化碳吸收和排放之间的总体平衡（碳平衡），并计算了碳中和因子（CN）以评估能源生产中使用生物质的环境影响。即，当考虑森林生态系统和能源生产的直接和间接排放时，每单位能源将排放多少二氧化碳。通常，当使用施肥和高商业前林分密度（4000-000棵树ha-1）进行管理时，两个物种的年生物量总产量最高。在挪威云杉的情况下，年生物量产量最高，轮作长度为80'-0.00年，而对于苏格兰松树，轮伐长度为40'-0。年，则具有最高的年产量。通常，CO2排放随着旋转长度的增加而减少。如果旋转长度从40年增加到60年，则减少幅度特别大。在所有不同的密度和轮作长度下，苏格兰松树每年产生的净二氧化碳排放量均显着低于挪威云杉，平均减少了29％。如果挪威云杉林分旋转为100年，苏格兰松树旋转为120年，则CN因子的值最高。每个能源单位的二氧化碳排放量大大低于使用煤炭所产生的二氧化碳，煤炭被用作评估能源生产中使用生物质的环境影响的参考。使用比芬兰林业目前建议的密度更高的商业前林分，并及时进行疏伐和施肥，可以增加生物量的总产量，同时也减少了能源木的使用所产生的二氧化碳净排放量。

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