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首页> 外文期刊>Bioenergy research >Impacts of Supplyshed-Level Differences in Productivity and Land Costs on the Economics of Hybrid Poplar Production in Minnesota, USA
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Impacts of Supplyshed-Level Differences in Productivity and Land Costs on the Economics of Hybrid Poplar Production in Minnesota, USA

机译：美国明尼苏达州生产力水平和土地成本的供应水平差异对杂交杨树生产经济学的影响

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The joint effects of poplar biomass productivity and land costs on poplar production economics were compared for 12 Minnesota counties and two genetic groups, using a process-based model (3-PG) to estimate aboveground biomass productivity. The counties represent three levels of productivity which, due to spatial stratification, were analogous to three biomass supplysheds. An optimal rotation age (ORA) was calculated that minimizes the annualized, discounted per-dry megagrams biomass cost for each county, genetic group and land cover, and for two discount rates (5 and 10 %). The ORA for the lowest-cost county (Todd) with specialist genotypes and a 5 % discount rate is 14 years and the breakeven price at that age is US$71 dry Mg−1, while for the highest-cost county (McLeod), the generalist genotype and a 10 % discount rate, the ORA is 10 years and the breakeven price at that age is US$175 dry Mg−1. Planting after a previous poplar stand increased breakeven prices and increased the ORAs by 1 to 2 years relative to planting after a previous annual crop. An ANOVA analysis showed a significant genetic group effect and significant productivity class × land rent interactions. All other factors being equal, an increase in the discount rate from 5 to 10 % is expected to reduce ORAs by 2 to 3 years. High-productivity supplysheds can also be expected to have ORAs that are 2 to 3 years shorter than low-productivity ones. Land costs were not as closely correlated to productivity as we expected.
机译：使用基于过程的模型（3-PG）估算地上生物量生产力，比较了明尼苏达州12个县和两个遗传群体的杨树生物量生产力和土地成本对杨树生产经济学的共同影响。县代表三个生产力水平，由于空间分层，类似于三个生物质供应场。计算的最佳轮换年龄（ORA）使每个县，遗传群体和土地覆盖的年度折现每干兆克生物量成本最小化，并且两个折现率分别为（5％和10％）。成本最低的县（Todd）具有专业基因型且折扣率为5％的ORA为14年，该年龄的损益平衡价格为71美元干Mg-1，而成本最高的县（McLeod）的ORA为基因型和10％的折现率，ORA为10年，该年龄的盈亏平衡价格为175美元干Mg-1。与先前的一年生作物相比，先前的杨树生长后的种植增加了收支平衡价格，并使ORA增加了1至2年。方差分析表明，显着的遗传群体效应和显着的生产力类别×××地租相互作用。在所有其他因素相同的情况下，折现率从5％提高到10％预计将使ORA减少2至3年。高生产率供应流域的ORA预计比低生产率供应流域短2至3年。土地成本与生产率没有像我们预期的那样紧密相关。

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