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为了明确水分胁迫对挖沙废弃地生境中柳枝稷(Panicum virgatum L.)生长和生物质品质的影响,在温室中通过盆栽试验,研究土壤相对含水量(80%、60%和40%)对3个柳枝稷品种(Alamo、Bay Canada、Cave-in-Rock)农艺性状、生理特性和生物质品质的影响。结果表明:随水分胁迫程度增加,柳枝稷株高降低、分蘖减少、生物量下降、根冠比增加;叶片净光合速率、气孔导度、胞间CO2浓度、蒸腾速率均显著下降;植株生物质中纤维素质量分数显著降低,半纤维素质量分数和热值有降低的趋势,木质素质量分数有升高趋势,但均无显著性差异。3个品种对水分胁迫的响应存在显著差异,其中Alamo综合表现最好,其长势、净光合速率、水分利用效率和干物质积累量最高,Cave-in-Rock次之,Bay Canada最低。
In order to clarify the effect of water stress on the growth and biomass quality of switchgrass (Panicum virgatum L.) in abandoned habitat, pot experiments were conducted to study the effect of soil relative water content (80%, 60% and 40% Effects of Agronomic Traits, Physiological Characteristics and Biomass Quality on Alamo, Bay Canada, Cave-in-Rock. The results showed that with the increase of water stress, the plant height of switchgrass decreased, tillers decreased, biomass decreased, and the ratio of root and shoot increased. The net photosynthetic rate, stomatal conductance, intercellular CO2 concentration and transpiration rate of the leaves decreased significantly. The cellulose content decreased significantly, the hemicellulose content and caloric value decreased, while the lignin content increased. However, no significant difference was found. There were significant differences in response to water stress among the three cultivars. Among them, Alamo was the best, with the highest growth, net photosynthetic rate, water use efficiency and dry matter accumulation, followed by Cave-in-Rock and Bay Canada.