硅酸盐细菌的生物效应和根际效应

Biological and Rhizospherical Effects of Silicate Bacteria

通过土培和水培试验,探讨了硅酸盐细菌的生物效应和根际效应。结果表明,当硅酸盐细菌的处理浓度在0～250g·L-1浓度范围内时,对小麦种子的发芽率几乎无影响。在0～2g·L-1浓度内,促进小麦苗和根的生长,以2g·L-1浓度对小麦苗和根的促生效果最佳;浓度为2～250g·L-1时,生长促进作用逐渐减弱直至抑制小麦的生长。硅酸盐细菌也能促进玉米苗的生长,对玉米根的促生效果优于地上部。硅酸盐细菌处理的小麦根际pH和速效P含量明显低于对照,而速效K则高于对照。

Biological and rhizospherical effects were discussed by soil and water culture experiments. It has been found that there was no effect on germinating rate of wheat at the concentrations of the silicate bacteria in a range of 0 to 250 g·L-1. From 0 to 2 g·L-1, the silicate bacteria could promote wheat shoot and root growth. The concentration of 2 g·L-1 was discovered to be the optimal concentration for growth promotion. From 2 g·L-1 to 250 g·L-1, growth-promoting effect decreased until refraining plant growth. In addition, silicate bacteria were found to be capable of promoting corn shoot growth,root growth more effective than the upper parts. pH and available P in wheat rhizosphere treated with silicate bacteria were significantly lower than those of Ck, but available K was vise versa.