第二章盐碱土海滨锦葵有机基质穴盘育苗技术的构建 - 扬州大学农学院.docVIP

扬 州 大 学 本科毕业生论文 论文题目： 耐盐能源植物海滨锦葵苗期对不同盐分浓度的响应 学生姓名： 某 某 某 所在学院： 农 学 院 专业班级： 农 区 0401 班 指导教师： 某 某 某 教授 完成日期： 2008 年 5 月 耐盐能源植物海滨锦葵苗期对盐分浓度的响应 ，农村区域发展专业2004级，03号 指导教师：教授 摘要：采用有机物/土壤混合基质穴盘育苗方式进行海滨锦葵育苗试验，研究了不同盐分浓度(0、0.3%、0.6%、0.9%和1.2%)下海滨锦葵的出苗、苗的生育和生理特性。结果表明，随着盐分浓度的增加，海滨锦葵出苗率明显降低育苗基质中的盐分浓度0.6%时，可以保持80%以上的出苗率当盐分浓度在0.6%以下时，移栽成活率保持65%以上，若要使得移栽成活率维持在75%以上，盐分浓度应保持在0.3%左右。随着盐分浓度的增加，移栽后海滨锦葵根、茎、叶的生长发育均受到影响，主要表现为株高降低，叶片长度和宽度变小，主茎叶龄和出叶速度降低，各器官干重下降，植株根系活力减弱，叶片可溶性蛋白、SOD活性及其水平受到明显影响，游离氨基酸和脂类过氧化产物MDA积累速度大幅度上升且光合特性受到明显影响。当苗床基质和土壤盐分浓度小于0.6%时，所受的负面影响相对较小。 关键词：海滨锦葵；；生长发育；生理活性 The Impact of Salt Stress on Salt-tolerant Bio-energy Plant K. virginica (L ) Presl. Abstract: The objective of this research was to make a probe into the effects of stress (0, 0.3%, 0.6%, 0.9% and 1.2%) on the growth and physiological characteristics of K. virginica seedlings so as to provide a solid base for the further research of seedling breeding. The seeds were sown into the pots of seedling plastic matrix containing the cultural mixture of organic substrate and conventional soil. Generally, when salt concentration in the mixture was less than 0.6%, the emergence rate was about 80.0%. When salt concentration in the mixture is higher than 0.6%, the emergence rate and survival rate of seedlings were higher than 65.0%. If the survival rate is expected be higher than 75.0%, salt concentration in the mixture should be kept lower than 0.3%. After seed transplantation, as salt concentration strengthened, the growth of root and leaf was greatly inhibited, the length and width of true leaves was significantly smaller than the control, the leaf age and fresh weight of different organs decreased significantly, and the root activity decreased as well. The concentration of soluble protein and SOD activity decreased signifi