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首页> 外文期刊>Bioenergy research >Twenty-Year Biomass Yields of Eight Switchgrass Cultivars in Alabama
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Twenty-Year Biomass Yields of Eight Switchgrass Cultivars in Alabama

机译：阿拉巴马州8个柳枝C品种的20年生物量产量

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摘要

Long-term experiments with perennial cellulosic energy crops are needed to determine stand longevity and yield trends over time, as affected by weather. Consequently, the objectives of this study were to determine the long-term biomass yields of eight switchgrass (Panicum virgatum L.) cultivars in Alabama and to evaluate effects of weather variables on annual yields. Two lowland cultivars (Alamo and Kanlow) and six upland cultivars (Blackwell, Cave-in-Rock, Kansas-Native, Pathfinder, Summer, and Trailblazer) were evaluated in a small-plot experiment in central Alabama. Plots were planted in 1989 and fertilized with 84 kg N ha−1 annually, split into two equal applications. The experiment received no P and K fertilizer, herbicides, or irrigation. Annual yields were determined by harvesting plots twice each year, from 1990 to 2009. Growing season (March 1 to October 31) precipitation ranged from 405 to 1,294 mm. All plots remained productive during the experimental period. Average yields were generally higher than those reported from other experiments and that of Alamo (23.5 Mg ha−1 year−1) was higher than yields of the other seven cultivars. Although yields of lowland cultivars varied over time, this variation was not related to age of stand or precipitation. In contrast, yields of all upland cultivars increased over the first 12 years, and yields of Blackwell, Cave-in-Rock, Kansas-Native, and Summer were positively related to precipitation. It is concluded that under similar soil, environmental, and management conditions, stands of switchgrass should be productive for 20 years or more.
机译：需要对多年生纤维素能源作物进行长期试验，以确定受天气影响的林木寿命和产量随时间的变化趋势。因此，本研究的目的是确定阿拉巴马州八个柳枝switch（Panicum virgatum L.）品种的长期生物量产量，并评估天气变量对年产量的影响。在阿拉巴马州中部进行的小规模试验中，评估了两个低地品种（阿拉莫和坎洛）和六个高地品种（布莱克韦尔，岩洞，堪萨斯州原生，探路者，夏季和开拓者）。地块种植于1989年，每年施肥84千克N·ha-1，分为两等份。该实验未施用磷钾肥，除草剂或灌溉。从1990年到2009年，每年通过两次收获土地来确定年产量。生长季节（3月1日至10月31日）的降水量在405毫米至1,294毫米之间。在实验期间，所有地块均保持生产力。平均产量普遍高于其他实验报告的产量，阿拉莫（23.5 Mg ha-1 year-1）的平均产量高于其他七个品种的产量。尽管低地品种的产量随时间变化，但这种变化与林分年龄或降水量无关。相比之下，在前12年中，所有陆地棉品种的产量都增加了，布莱克韦尔，岩洞，堪萨斯州和夏季的产量与降水量呈正相关。可以得出结论，在相似的土壤，环境和管理条件下，柳枝stands的林分生产力应达到20年或更长时间。

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