外源磷与AMF对间作玉米种植红壤无机磷形态的影响

通过三室隔网分室盆栽模拟试验,研究了分室不同磷(P)源无机磷(磷酸二氢钾)和有机磷(大豆卵磷脂),P添加量均为50 mg·kg-1]添加和根室接种不同丛枝菌根真菌(AMF)Glomus mosseae(GM)、Glomus etunicatum(GE)]对间作玉米种植红壤无机磷形态的影响。结果表明:无论接种与否,间作处理使根室土壤有效磷含量显著降低,说明间作能够促进玉米植株对土壤有效磷的吸收,且有效磷的耗竭从根际土壤开始。除OP50-单作玉米处理的Org-P外,接种AMF均一定程度增加了各形态无机磷含量。此外,根室土壤有效磷的主要组分为Ca2-P、Al-P和Org-P,其中Org-P与土壤有效磷有着极显著的负相关关系。

Effect of phosphorus addition and different AMF on inorganic phosphorus forms in red soil under intercropping maize plants

A pot simulation experiment was conducted to study the phosphorus ( P ) forms in red soil under different P sources inorganic phosphorus ( potassium dihydrogen phosphate) and organic phosphorus ( soy lecithin) ] addition to com-partment chamber ( P 50 mg · kg-1 soil respectively ) and two different kinds of arbuscular mycorrhizal fungi ( AMF ) , i. e. Glomus mosseae ( GM) and Glomus etunicatum ( GE) , inoculation for intercropping maize planting condition. The re-search results showed that regardless of the inoculation of AMF, intercropping treatment significantly decreased the available P content in soil of root chamber, which indicated that intercropping promoted the absorption of available P by maize plants from soil, and the available P exhaust began from the rhizosphere soil. Except the Org-P under OP50 addition and mono-maize treatment, AMF inoculation increased the contents of all inorganic P forms to a certain extent. Ca2-P, Al-P and Org-P were the main group of soil available P in the soil of root chamber, and the Org-P was significantly negative correlated with available P in red soil.