钠、硅及钠硅互作提高梭梭抗旱性的研究

Effects of Separate and Mutual Application of Na and Si on Drought Resistance of Haloxglon ammodendron

采用盆栽试验,施用不同浓度NaCl、H2SiO3及NaCl+H2SiO3对培育梭梭(Haloxylon a mmodendron)的生长、生理变化及抗逆性方面进行了研究。结果表明,0.3g.kg-1 NaCl、0.2g.kg-1 H2SiO3或0.3g.kg-1 NaCl+0.1g.kg-1 H2SiO3互作施用均能显著促进梭梭的生长并提高其抗旱性。单施NaCl时,0.3g.kg-1 NaCl处理培育的梭梭株高、冠幅和鲜重与对照相比分别增加了42%、91%和62%,其主茎直径、主根直径和主根长分别增加了40%、39%和23%。单施H2SiO3时,0.2g.kg-1 H2SiO3处理培育的梭梭株高、冠幅、鲜重与对照相比分别增加了36%、45%和27%,其主茎直径、主根直径和主根长分别增加了23%、23%和20%。与施用0.3g.kg-1 NaCl处理相比,0.3g.kg-1 NaCl+0.1g.kg-1 H2SiO3互作处理梭梭株高、冠幅、鲜重和主根长分别增加了9%、10%、17%和12%;与施用0.1g.kg-1 H2SiO3处理相比,0.3g.kg-1 NaCl+0.1g.kg-1 H2SiO3互作处理梭梭株高、冠幅和鲜重分别增加了28%、76%和68%,其主茎直径、主根直径和主根长分别增加了30%、32%和27%。这表明适量水平的NaCl+H2SiO3互作施用要比单独施用NaCl或H2SiO3能更有效地促进梭梭的生长并提高其抗旱性。

We studied pot cultivated Haloxylon ammodendron＇s growth, physiological changes and drought resistance under NaCl, H2SiO3 and NaCl＋ H2SiO3 treatments. Results show that 0.3 g.kg^-1 NaCl, 0.2 g. kg^-1 H2SiO3 or 0.3 g.kg^-1 NaCl＋0.1 g. kg^-1 H2SiO3 treatments can effectively promote the growth and improve the drought resistance ofHaloxylon ammodendron. Compared with that under no NaC1 treatment, Haloxylon ammodendron＇s height, crown diameter and fresh weight increased by 42 %, 91% and 62 % re- spectively under 0.3 g. kg^-1 NaCI treatment, and its main stem diameter, main root diameter and main root length increased by 40%, 39% and 23%, respectively. Compared with that under no H2SiO3 treatment, Haloxylon arnmodendron＇s height, crown diameter and fresh weight increased by 36 %, 45 % and 27 % respectively under 0. 2 g-kg^-1 HeSiO3 treatment, and its main stem diameter, main root diameter and main root length increased by 23%, 23% and 20%, respectively. Compared with that under 0. 3 g.kg^-1 NaCl treatment, Haloxylon arnmodendron＇s height, crown diameter, fresh weight and main root length in- creased by 9%, 10%, 17% and 12% respectively under 0.3 g.kg^-1 NaCl＋0.1 g.kg^-1 H2SiO3 treatment. Compared with that under 0.1 g. kg^-1 H2 SiO3 treatment, Haloxylon ammodendron＇s height, crown diame- ter and fresh weight increased by 28%, 76% and 68% respectively under 0.3 g.kg^-1 NaCl＋0.1 g.kg^-1H2SiO3 treatment, and its main stem diameter, main root diameter and main root length increased by 30%, 32% and 27%, respectively. It suggests that moderate level of NaCl＋H2SiO3 interaction can more effec- tively promote growth ofHaloxylon ammodendron and improve drought resistance ofHaloxylon ammo- dendron than separate application of NaCI or H2SiO3.