盐胁迫对互花米草和芦苇叶片光合作用的影响
毕业论文关键词： 盐胁迫；光合作用；互花米草；芦苇
Effects of salt stress on photosynthesis about leaves of Spartina and Reed
Abstract：Using Spartina and Reed as material, this research study the photosynthesis parameters of Spartina and Reed under different salt stress. The result shows that in Spartina, salt stress would curb photosynthesis. With the increase in salt concentration, the net photosynthetic rate, transpiration rate and stomatal conductance would decline, but rebounds are found at the salt concentration of 30g/L and 50g/L, yet the three parameters are still below the ones in control group. In Reed, before the salt stress reach 10g/L, the net photosynthesis rate keeps rising. Reaching the top at 10g/L, the rate start to decline, and after the salt concentration get to 30g/L, the rate becomes lower than that in control group. As the study shows, photosynthesis of Spartina and Reed is affected by salt stress, which is related to stoma. Under the salt stress, photosynthesis of Spartina is stronger than that of Reed, which means Spartina’s salt tolerance is better than Reed’s. Salt stress of low concentration would cause a rise in photosynthesis in Reed, while high concentration of salt would make the rate decline, even to a level that is lower than that in control group. Salt stress would make an effect on the photosynthesis of both Spartina and Reed.
Key Words：salt stress, photosynthesis, Spartina，Reed
目 录
1 绪论 3
1.1 盐碱地的概念及分布情况 3
1.2 研究意义 3
1.3 国内外对于盐胁迫对于光合作用的影响研究的概况及必要性 3
1.4 本实验设计的互花米草与芦苇的形态学资料以及光合作用有关资料 6
1.4.1 互花米草与芦苇的形态学资料 6
1.4.2植物光合作用、气孔导度、蒸腾作用的概念、所受影响的因素以及其他相关资料 6
2 材料与方法 8
2.1材料 8
2.2方法 8
2.2.1盐胁迫处理方法 8
2.2.2光合作用参数的测定方法 8
2.2.3光合作用参数的处理方法 8
3 结果与讨论 9
3.1 不同浓度NaCl盐胁迫下对互花米草、芦苇的光合速率的影响 9
3.2 不同浓度NaCl盐胁迫下对互花米草、芦苇的蒸腾作用的影响 11
3.3 不同浓度NaCl盐胁迫下对互花米草、芦苇的气孔导度的影响 12
3.4互花米草 气孔导度分别对蒸腾作用、光合速率的影响 13
4 讨论 14
1 绪论
1.1 盐碱地的概念及分布情况
盐碱地是盐类集聚的一个种类，指土壤中的PH值不呈现中性，而是H+或OH-含量过高，当H+含量过高时会呈现盐性，而OH-含量过高时则呈现碱性。土壤里面所含的盐分影响到作物的正常生长。各种盐碱土都是在一定的自然条件下形成的，其形成的实质主要是各种易溶性盐类在地面作水平方向与垂直方向的重新分配，从而使盐分在集盐地区的土壤表层逐渐积聚起来。影响盐碱土形成的主要因素有：气候条件；气候条件；土壤质地和地下水；河流和海水的影响；耕作管理的不当。我国盐碱土分布区是根据它的土壤类型和气候条件变化决定的，分为滨海盐渍区、黄淮海平原盐渍区、荒漠及荒漠草原盐渍区、草原盐渍区四个大类型。
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