不同浓度海水胁迫对菊芋幼苗生长发育及磷吸收的影响

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。本试验通过不同浓度海水处理研究菊芋幼苗生长发育及对³²P吸收利用差异和离子吸收分布的情况。结果表明:在不同浓度海水浇灌下,菊芋地上部、地下部、总鲜重及干物质重从CK到50%海水浓度没有明显变化,在75%海水胁迫下显著下降,干物质百分比则为75%海水浇灌的最高;在中等P水平下,地上部在25%海水处理下对³²P吸收率最高;随海水浓度增高菊芋幼苗地上部单位干重积累的Na⁺和Cl^-依次增大;而K⁺与Na⁺积累情况不同,K⁺在25%海水胁迫下地上部单位干重积累的最多,其次是50%,CK和75%海水胁迫差不多;地下部单位干重积累的Na⁺、Cl^-和K⁺情况与地上部单位干重积累的各离子趋势相似。

Effects of different concentrations of seawater on growths, developments and absorption of P of Helianthus tuberosus seedlings

Growing plants that can resist salt and tolerate the seawater is one of valid steps in rightful use and exploiture of coastal soil. Pot experiments were carried out to study the effects of treatments with different concentrations of seawater on growths, distributions of ions, and different absorption of 32P of Helianthus tuberosus seedlings. The results were as follows: Compared with the control, there were slight changes of the fresh weight (FW) and the dry weight (DW) of roots and the shoots of Helianthus tuberosus seedlings treated with 25% and 50% seawater, while they significantly declined treated with 75% seawater. But the percentage of DW was highest under 75% seawater stress than others treatments. The absorption ratio of 32P was highest for the seedlings treated with 25% seawater under the moderate level of P. The contents of Na + and Cl - in the shoots added with the enhancements of seawater concentrations. Compared with Na +, the K + content was highest under 25% seawater stress, then 50%, control and 75% in turn. And the contents tendencies of Na +, Cl - and K + of the unitage dry weight in roots were similar with them in the shoots.