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OALib Journal期刊
ISSN: 2333-9721
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土壤水分状况对麻疯树幼苗光合作用、超微结构和生理特征的影响
DOI: 10.3724/SP.J.1145.2010.00483, PP. 483-488
Keywords: 麻疯树,土壤水分含量,光合作用,超微结构,稳定碳同位素比率,n含量,水分利用效率
Abstract:
在控制试验条件下通过盆栽试验设置3个土壤水分[分别为田间持水量（fc）的80%、50%和30%]处理，研究土壤水分状况对麻疯树幼苗光合作用、超微结构及生理特征的影响.结果表明：土壤含水量为80%fc时，麻疯树叶片净光合速率（pn）、光合色素含量、稳定碳同位素比率（δ13c）、n含量和水分利用效率（wue）最低；丙二醛（mda）和过氧化氢（h2o2）含量、气孔导度（gs）、胞间co2浓度（ci）和蒸腾速率（tr）最高；叶肉细胞超微结构显示，叶绿体内部形成较大的淀粉粒，挤压严重.土壤含水量为50%fc时，mda和h2o2含量、gs、ci和tr显著地高于30%fc处理，而叶片n含量和δ13c与30%fc处理无显著差异.土壤含水量为30%fc时，pn、光合色素含量、叶片n含量和wue最大，mda和h2o2含量最低；叶绿体内部淀粉粒和嗜饿颗粒体积较小，内部结构清晰可见，叶绿体膜结构完整.考虑到麻疯树是主要以种子为经济价值的树种，结合四川攀西地区的土壤养分状况，土壤湿度应控制在田间持水量的30%~50%左右，此时麻疯树光合作用最强，叶片n含量最高，wue最大，将更有利于其生长结实，而过多的土壤水分可能会导致其徒长.图4表1参28
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