Crop‐livestock integration has declined in North America over the last century but economic and environmental priorities may reverse that trend (Russelle et al., 2007).Landowners, especially in drier climates ill suited to row crops, can reduce risks by integrating crops such as biofuels with their current livestock priorities (Allen et al.,2007).If biofuel cropping is to succeed in sub‐humid and semi‐arid climates and on a wide scale, it must integrate into existing systems, initially as a secondary crop until biofuel feedstock markets become stable.Landowner culture (Esterchild and Stanley‐Stevens, 2005) and unpredictable climate leave no other choice.In drought years, keeping herds and flocks alive will take priority for socio‐cultural and economic reasons while excess forage in high rainfall years can provide inexpensive biofuel stocks.Our challenge will be to design biofuel cropping systems that can best integrate into entrenched animal farming systems while still providing constant fuel supplies to future conversion plants.
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机译：上个世纪北美的农牧业一体化程度有所下降，但经济和环境方面的优先考虑可能会扭转这一趋势（Russelle等人，2007）。尤其是在干旱气候不适合大田作物的情况下，放牧者可以通过整合诸如此类的作物来降低风险。如果要在半湿润和半干旱气候下大规模推广生物燃料的种植，则必须将其整合到现有系统中，从最初作为次要作物，直到生物燃料原料市场趋于稳定。朗纳德文化（Esterchild and Stanley-Stevens，2005）和不可预知的气候别无选择。在干旱年份，出于社会文化和经济原因，保持牲畜和羊群的生存将是重中之重，而在高降雨中饲草过多年可以提供廉价的生物燃料库存。我们的挑战将是设计能够最好地整合到根深蒂固的动物养殖系统中同时仍提供稳定的生物燃料种植系统。向未来的转换工厂提供新台币燃料。
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