AMF接种与根系分隔对红壤上间作玉米生长及磷素吸收的影响

通过盆栽模拟试验研究比较以Glomus mosseae(GM)和Glomus etunicatum(GE)为接种剂,设置不同根系分隔方式(不分隔,隔尼龙网,隔塑料膜)对间作玉米植株生长及磷素吸收累积的影响。结果表明,两种菌根真菌GM和GE对玉米根系的侵染效果相近,GM为玉米优势丛枝菌根真菌(AMF),接种GM使玉米根长、地上部和根系生物量、地上部和根系磷含量、磷吸收量均显著提高;接种GE显著降低了玉米根冠比、株高和根系磷吸收效率。间作体系不同根系分隔方式对玉米的影响也不同,根系隔尼龙网处理显著降低了玉米根长和根系生物量,显著提高了根系的磷含量;根系隔塑料膜处理对玉米的地上部和根系磷含量、磷吸收量以及根系磷吸收效率均起显著降低作用。所有复合处理中,以GM不分隔处理组合对间作玉米的生长及磷素累积的促进作用最好。

Effect of AMF Inoculation and Roots Separation on Plant Growth and Phosphorus Nutrition in Maize Growing on Red Soil under Intercropping Conditions

The plant growth and phosphorus(P) uptake by intercropped maize on red soil were studied. The intercropping maize and soybean roots were separated by different condition(not separated, nylon net separated, plastic-film separated) and inoculated with Glomus mosseae(GM) and Glomus etunicatum(GE). The results showed that the colonization rate of intercropping maize roots under inoculation of GM or GE had no significant difference. GM was the advantage of AMF for symbiotic with maize, and the inoculation of GM could significantly increase the roots length and biomass of maize, thereby making maize could uptake more P. While inoculation of GE significantly decreased maize roots/shoots ratio, plant height and roots P uptake efficiency. The effects of different roots separation on maize were also different respectively. Nylon net separated treatment significantly reduced maize roots length and roots biomass, but significantly increased the roots P concentration, and plastic-film separated treatment significantly reduced maize shoots and roots P concentration, P uptake and roots P uptake efficiency. In all treatments, the treatment of GM inoculation and roots not separated was the best for intercropping maize plants growth and P accumulation.