论文部分内容阅读
为了探讨干旱条件下不同种类和不同施用量的保水剂对海滨雀稗光合作用及生理特性的影响,本试验对海滨雀稗施用了3种不同保水剂S1、S2和S3,每种保水剂施用量均为0、10、20和30g/m~2,在自然干旱条件下连续处理28 d,以正常管理作为对照组。结果表明,同单一干旱胁迫相比,保水剂提高了土壤含水量,增加了根系生物量和根系活力,改善了坪观质量,缓解了叶片相对含水量和叶绿素含量的下降,减少了电解质渗透率和丙二醛含量的上升,同时,保水剂还提高了净光合速率、蒸腾速率和气孔导度。因此,保水剂可以提高海滨雀稗的抗旱性,并且抗旱性随着保水剂施用量的增加而增强。在施用量相同时,不同种类的保水剂对海滨雀稗抗旱性的影响存在一定差异,3种保水剂保水抗旱的效果依次为S1>S2>S3。
In order to investigate the effects of different types and amounts of water-retaining agents on the photosynthesis and physiological characteristics of paspalums in the dry conditions, three different water-retaining agents S1, S2 and S3 were applied to the seashore paspalum. The treatments were 0, 10, 20 and 30g / m ~ 2, respectively, and were treated for 28 days under natural drought conditions. Normal control was used as the control group. The results showed that, compared with the single drought stress, the water-retaining agent increased soil water content, increased root biomass and root activity, improved Pingguanyin quality, alleviated the decline of leaf relative water content and chlorophyll content, and reduced the electrolyte permeability And the content of malondialdehyde increased. Meanwhile, the SAP also increased net photosynthetic rate, transpiration rate and stomatal conductance. Therefore, the water-retaining agent can improve the drought resistance of seashore paspalum, and the drought-resistance increases with the increasing amount of water-retaining agent. At the same application rate, the effects of different types of water-retaining agents on the drought resistance of paspalum selaginella are different. The effects of three kinds of water-retaining agents on water and drought resistance are S1> S2> S3.