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种植抗盐耐海水植物是合理利用和开发海涂资源的有效措施之一。采用沙培的方式,研究了不同浓度海水对菊苣幼苗生物量、离子吸收分布、叶绿素含量以及光合作用变化的影响。结果表明:1)10%海水处理下,菊苣幼苗生物量、叶绿素含量、净光合速率与对照相比差异不显著,表明较低浓度的海水处理对菊苣幼苗生长没有明显的抑制作用;而20%、30%和40%的海水处理则显著降低了菊苣幼苗的生物量、叶绿素含量、净光合速率、气孔导度和蒸腾速率,说明高浓度海水抑制了菊苣幼苗叶绿素含量,降低了光合碳同化能力,不利于幼苗的生长;2)随海水浓度增高菊苣幼苗地上部与地下部单位干质量积累的Na+和Cl-依次增大,而K+积累情况则不同,K+在20%海水胁迫下地上部单位干质量积累的最多,地下部单位干质量积累的K+情况仍然呈现显著升高的趋势。表明菊苣幼苗具有一定耐盐性,具备咸水微咸水灌溉栽培的潜势。
Planting salt resistant seawater plants is one of the effective measures to make rational use and development of marine resources. The effects of seawater with different concentrations on the biomass, ion absorption distribution, chlorophyll content and photosynthesis of chicory seedlings were studied using sand culture method. The results showed that: 1) The biomass, chlorophyll content and net photosynthetic rate of chicory seedlings under 10% seawater treatment showed no significant difference compared with the control, indicating that seawater treatment at low concentration did not significantly inhibit the growth of chicory seedlings; while 20% , 30% and 40% seawater treatment significantly reduced the biomass, chlorophyll content, net photosynthetic rate, stomatal conductance and transpiration rate of chicory seedlings, indicating that high concentrations of seawater inhibited chlorophyll content and reduced photosynthetic carbon assimilation capacity , Which is unfavorable to the growth of seedlings. (2) Na + and Cl- accumulation of dry mass accumulate in above and below ground units of chicory seedlings increased with increasing seawater concentration, but K + accumulation was different. K + The K + accumulation with the highest mass accumulation and dry mass accumulation in the underground units still shows a significant increase trend. Show chicory seedlings have a certain salt tolerance, with salt water brackish water irrigation potential cultivation.