Cellulosic ethanol production: landscape scale net carbon strongly affected by forest decision making.
Cellulosic ethanol production: landscape scale net carbon strongly affected by forest decision making.
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DOI：
10.1016/j.biombioe.2015.08.002
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发表时间：
2015-12
影响因子：
6
通讯作者：
A. Brunner;W. Currie;Shelie A. Miller
中科院分区：
文献类型：
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作者：
A. Brunner;W. Currie;Shelie A. Miller
在利用森林生物质生产可再生生物燃料纤维素乙醇的过程中，生物燃料对化石燃料碳(C)排放的置换与不断加重的林地的高碳储存率之间存在权衡。为了评估这一权衡，必须考虑受原料收获影响的景观面积，这取决于许多因素，包括森林生产力、碎片化景观中的森林数量以及林地所有者将木材作为生物能源原料出售的意愿。我们将这些考虑因素结合到一个新的基本模拟模型CEBRAM中，并将其应用于美国密歇根州北部短轮伐期白杨林的假想景观，从而研究了景观尺度的净碳平衡。该模型对该地区森林物种、生长和生态系统碳储量以及森林覆盖的景观空间格局进行了参数化。为了了解森林所有者的决策过程并将其参数化，我们调查了密歇根州的505名非工业私有林主。调查结果表明，47%的NIPF所有者愿意采伐森林生物质作为生物能源。模型结果表明，在40年的时间范围内，在不考虑土地利用的情况下，在这个速度下，纤维素乙醇系统的净碳平衡为0.024千克/平方米。如果算上堆积的、未参与的NIPF土地上的碳贮量，40年来净碳平衡为1.09亿kg/m2。在该地区，通过白杨林的堆积比通过森林生物质生产的纤维素乙醇取代汽油可以实现更大的总体碳增量。
In producing cellulosic ethanol as a renewable biofuel from forest biomass, a tradeoff exists between the displacement of fossil fuel carbon (C) emissions by biofuels and the high rates of C storage in aggrading forest stands. To assess this tradeoff, the landscape area affected by feedstock harvest must be considered, which depends on numerous factors including forest productivity, the amount of forest in a fragmented landscape, and the willingness of forest landowners to sell timber as a bioenergy feedstock. We studied landscape scale net C balance by combining these considerations in a new, basic simulation model, CEBRAM, and applying it to a hypothetical landscape of short-rotation aspen forests in northern Michigan, USA. The model was parameterized for forest species, growth and ecosystem C storage, as well as landscape spatial patterns of forest cover in this region. To understand and parameterize forest owner decision making we surveyed 505 nonindustrial private forest (NIPF) owners in Michigan. Survey results indicated that 47% of these NIPF owners would willingly harvest forest biomass for bioenergy. Model results showed that at this rate the net C balance was 0.024 kg/m2for a cellulosic ethanol system without considering land use over a 40 year time horizon. When C storage in aggrading, nonparticipating NIPF land was included, net C balance was 1.09 kg/m2over 40 years. In this region, greater overall C gains can be realized through aspen forest aggradation than through the displacement of gasoline by cellulosic ethanol produced from forest biomass.