供应不同形态氮肥VA菌根对三叶草苗期生长和磷素营养的影响

本试验采用三室盆栽系统研究两种不同形态的氮肥(铵态氮和硝态氮)接种泡囊——丛枝(VA)菌根真菌对三叶草苗期植株生长和磷素营养的影响。测定各处理植株的生长量和根系的总长度,分析植株 N,P,K 等养分的含量和收获后中室边室土壤 Olsen-P 浓度及 pH值。结果表明,施用两种不同形态的氮肥,接种菌根真菌显著增加了植株的干物重,提高了植株中 P 的含量,且在 NH_4-N 的处理中,菌根效应要大于 NO_3-N 的处理。施 NH_4-N,菌根处理的边室土壤 pH 值和 Olsen-P 的含量都显著低于未接种的处理,而施硝态氮的处理菌根对pH 值的影响不显著。说明菌根对寄主植物的营养效应与环境中氮素的形态有密切的关系。

Effect of VA-Mycorrhiza on the Growth and P-Uptake by Red Clover Plants Supplied with Different N-Forms

The effect of different forms of nitrogen(ammonium and nitrate)on the growth of red clover(Trifolium prafensel)inoculated by VA mycorrhizal fungi was studied in a greenhouse experiment. The result showed that the shoot dry weight of the infected plants was greater than that of the plants without infection.Both nitrogen forms and mycorrhizal fungi,affected the host plant roots morphology, such as:the total length of the roots,root diameter and root/shoot ratio,mycorrhizal roots were short- er and its diamete...