| 摘要: |
| 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。 |
| 关键词: 柳枝稷 水分胁迫 边际土地 生物质 |
| DOI：10.11841/j.issn.1007-4333.2012.02.011 |
| 投稿时间：2011-09-14 |
| 基金项目:北京市科技计划(Y06050600000701,Z07000601580708); 北京市农林科学院青年科研基金(QNJJ201019) |
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| Effects of water stress on growth and biomass quality of switchgrass |
|
ZHU Yi1,2, FAN Xi-feng2, WU Ju-ying2, DUAN Liu-sheng1, HOU Xin-cun2
|
| (1.Key Laboratory of Farming System of Ministry of Agriculture/College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China;2.Beijing Research and Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China) |
| Abstract: |
| The effects of water stress (the relative water contents were 80%,60% and 40% respectively) on growth and biomass quality of switchgrass (Panicum virgatum L.) were studied using three cultivars,namely Alamo,Cave-in-Rock and Bay Canada,in pots with soil from marginal land of sand with gravel in greenhouse.It showed that all the plant height,tiller number and biomass accumulation were decreased with the increase of the intensity of water stress;whereas the root/shoot ratio was increased.The net photosynthetic rate,stomatal conductance,intercellular CO2 concentration and transpiration rate were lowered significantly under water stress.Water stress reduced significantly the concentrations of cellulose and hemicellulose and the gross caloric values;while increased the lignin concentration.Three cultivas showed different responses to water stress.When concerned growth,net photosynthetic rate,water use efficiency and dry biomass accumulation in this experiment,Alamo was better than Bay Canada and Cave-in-Rock. |
| Key words: switchgrass water stress marginal land biomass |
