AMF与分室磷添加对红壤上间作大豆生长及无机磷利用的影响

Effect of AMF Inoculation on Plant Growth and P Utilization of Intercropped Soybeans under P Addition to Chamber on Red Soil

【目的】近年来,间作或菌根技术强化作物对土壤磷(P)的高效利用及粮油增产的效应受到越来越多的关注。【方法】采用三室隔网盆栽模拟试验探究了分室磷处理[不添加磷(P0)、添加无机磷(IOP50)]和根室不接种(NM)、接种丛枝菌根真菌Funneliformis mosseae(FM)对大豆生长及磷素利用的影响。【结果】所有复合处理中以间作-FM-IOP50组合处理的根系最长。接种FM条件下,无论磷添加与否,间作处理的根长均显著高于单作处理。间作-IOP50和间作-P0处理下,FM处理的大豆植株生物量较NM处理分别提高了65.41%和48.76%,单作-IOP50和单作-P0条件下,大豆植株生物量均以FM处理高于NM处理,分别增加了70.13%和28.75%。无论是否接种,间作-IOP50处理的大豆地上部磷含量均显著高于单作-IOP50处理,且在P0处理下具有相同趋势。无论是否接种,单作-IOP50处理的大豆根系磷含量均显著高于单作-P0处理,且无论分室磷添加与否,大豆根系磷含量均以FM处理显著高于NM处理。NM条件下,无论分室磷添加与否,间作大豆地上部磷吸收量均显著高于单作,而间作根系磷吸收量也显著高于单作。接种FM条件下,除单作-IOP50处理外,间作大豆根系磷吸收量明显高于单作处理。【结论】综合菌根侵染与植物生长,磷含量与吸收、磷吸收效率等指标,所有复合处理中以间作-FM-IOP50组合对大豆地上部的促生作用最好、磷素吸收最多,可望有效强化红壤磷素的利用。

【 Objective】 In recent years, more and more attention had been paid to the use of intercropping or mycorrhizal technology to strengthen soil phosphorus （P） efficient utilization and increase grain yield.【 Method】A root growth chamber with two different P treatment ways [ none P （ P0） , inorganic P （ potassium dihydrogen phosphate） with 50 mg/kg soil） ] and two mycorrhizal treatments [ no AMF （ NM）, Funneliformis mosseae （FM） inoculation] was conducted to investigated the plant growth and P utilization of soybean intercropped with maize （Zea mays L. ） on red soil.【 Result】 The results showed that among all composite treatments, the longest root length occurred under the con-dition of intercropping-FM-IOP50 treatment, and for the FM treatment, regardless of P addition, root length of intercropping soybean was sig-nificantly higher than that of mono-cropping treatment. The biomass of soybean plant for FM treatment increased by 65.41 % and 48.76 % respectively over NM treatment under intercropping IOP50 and P0 conditions, and the biomass of soybean plant for FM treatment was higher than that for NM treatment,increased by 70. 13 % and 28. 75 % under mono-cropping IOP50 and P0 conditions. Whether AMF inoculation or not, P concentration in soybean shoots under intercropping IOP50 treatment was significantly higher than mono-cropping IOP50 treatment, and the same as for P0 treatment. Whether AMF inoculation or not, P concentration of soybean roots under mono-cropping IOP50 treatment was significantly higher than mono-cropping P0 treatment, and whatever of P addition or not, P concentration of soybean roots under FM treat-ment was also significantly higher than NM treatment. Under the NM treatment, regardless of P addition, the P uptake by soybean shoots androots under intercropping treatment was also significantly higherthan mono-cropping treatment. Under the FM treatment, except mono-cropping-IOP50 treatment, the P uptake by soybean roots for intercropping treatment was also significantly higher than that for mono-cropping treatment.【Conclusion 】Thus AMF in-oculation, P application and intercropping planting could pro-mote plant growth to a certain extent respectively, and the treatment of intercropping-FM-IOP50 was the best one for shoot growth and P up-take of intercropped soybean, which could effectively strengthing P use on red soil.