摘要
为了研究钾对缓解樟子松苗木淹水胁迫的生理效应。该试验在盆栽条件下,以2a生樟子松为试材,设置0(CK)、4、8、12g/株4个钾肥施用量处理,3次重复。试验结果显示:(1)随淹水时间延长,樟子松光合速率降低,施用钾肥提高了光合速率,第7~10天,8g/株和12g/株处理显著高于4g/株;(2)施钾提高了第4~10天的蒸腾速率和气孔导度,第10天,8g/株和12g/株处理显著高于4g/株处理,且两者之间无显著差异;(3)施钾降低了淹水胁迫第4~10天的胞间CO_(2)浓度,第10天8g/株和12g/株处理显著低于4g/株;(4)施钾提高了第7~10天SOD和POD活性,第10天8g/株和12g/株处理显著高于4g/株和对照。(5)钾肥可以提高淹水胁迫下樟子松光合能力和保护酶活性,且随淹水时间延长效果越显著。表明:钾能够提高樟子松植株在淹水状态下的光合能力,也会通过影响植株保护酶活性来改善其胁迫状态。不同施用量分析认为钾肥施用量为8g/株可以有效缓解樟子松的淹水胁迫。
【Objective】The testwant to study the physiological effects of potassium on alleviating flooding stress of Pinus sylvestris var.mongolica Litv.seedlings.【Method】The test under potted condition,2-year-old Pinus sylvestris var.mongolica Litv.as the test material,then set four potassium fertilizer application rates by 0(CK),4g/plant,8g/plant,and 12g/plant,repeated three times.【Test results】(1)The Pinus sylvestris var.mongolica Litv.photosynthetic rate decreased with the prolongation of flooding time,and the application of potassium fertilizer increased the photosynthetic rate,the 8g/plant and 12g/plant treatments were significantly higher than 4g/plant on days 7-10;(2)Potassium application increased the transpiration rate and stomatal conductance from the 4th to 10th day,the 8g/plant and 12g/plant treatments were significantly higher than the 4g/plant treatments on the 10th day,and there was no significant difference between them;(3)Potassium application reduced the intercellular CO_(2) concentration on the 4th to 10th day under flooding stress,the 8g/plant and 12g/plant treatments were sig-nificantly lower than 4g/plant on the 10th day;(4)Potassium application increased SOD and POD activities from day 7 to day 10,and 8g/plant and 12g/plant treatments were significantly higher than those in 4g/plant and controlon day 10;(5)Potassium fertilizer can improve the photosynthetic capacity and protective enzyme activity of Pinus sylvestris var.mongolica Litv.under flooding stress,and the effect is more significant with the prolon-gation of flooding time.【Conclusion】Potassium can improve the photosynthetic capacity of Pinus sylvestris var.mongolica Litv.plants under flooding,and it alsocan improve the stress status by affecting the activities of plant protection enzymes.
作者
赵淑琴
ZHAO Shu-qin(Forestry Seedling Cultivation Center of Huairen City,Huairen,Shanxi 038300)
出处
《河北林业科技》
2022年第1期41-45,共5页
Journal of Hebei Forestry Science and Technology
关键词
钾肥
樟子松
淹水胁迫
光合作用
保护酶
potash fertilizer
Pinus sylvestris var.mongolica Litv.
flooding stress
photosynthesis
protective enzymes
作者简介
赵淑琴(1970-),女,学士,林业高级工程师,研究方向为森林培育。
