Abstract: Bast fiber seedling film is a new film material used for raising rice seedling by machine transplanting. Great deals of application practice have indicated that matting bast fiber seedling film on the bottom surface of seedling plate of seedling plug machine could stimulate the growth and development of seedling root system and improve seedling quality. However, its action mechanism is still unclear. This paper measured and analyzed the micro morphological characteristics of bast fiber seedling film, and investigated the compensation effect of oxygen supply to bottom plate through directly testing oxygen concentration at the bottom surface of seedling plate, combined with simulated demonstration method. The results showed that bast fiber seedling film could quickly compensate for oxygen consumption at the bottom of seedling plate. After the external oxygen entered the hole, microporous diffusion occured in the seedling film. Then oxygen was transfered to entire film surface, where oxygen could directly contact rice roots, ultimately increase the number of root system and oxygen uptaken, and then an effect similar to aerobic cultivation was achieved.

Key words: bast fiber seedling film, rice plug and seedling machine, root-zone oxygen, aerobic cultivation

摘要： 麻育秧膜是一种用于水稻机插盘育秧的新型膜材料，大量的应用实践表明在机插育秧盘底面垫铺麻育秧膜可显著促进秧苗根系生长发育，提高秧苗素质，然而其作用机理尚未明确。检测分析了麻育秧膜的微观形态特征，通过直接测定秧盘底面氧浓度，结合模拟演示方法，探索了在水稻机插育秧盘底面垫铺麻育秧膜对盘底氧供应的补偿效应。结果表明：盘底垫铺麻育秧膜可迅速补偿盘底面氧气消耗，外界氧气进入盘底小孔后，依赖麻育秧膜进行微孔扩散，转移到整个育秧膜面并与底层根系表面直接接触，最终显著增加可直接接触到氧气的根系数量，进而增加根系摄氧，从而达到类似于增氧栽培的效果。

关键词: 麻育秧膜, 机插育秧, 根际氧, 增氧栽培