不同氮磷浓度对AM真菌生长和养分吸收的影响

以高粱为宿主植物，三室隔离培养盒为培养容器，研究在菌丝室施加不同浓度的N，P肥料下接种AM真菌对高粱生长和养分吸收的影响。结果显示：接种AM真菌的高粱菌根侵染率达到70%以上；接菌高粱生物量和叶绿素含量均比未接菌时高，且总氮总磷含量均有显著的提高。在接菌情况下，高粱总氮含量随氮浓度的升高而升高，随磷浓度的升高而降低；且在施肥处理为4 mmol·L-1氮肥、0。01 mmol·L-1磷肥（N2P1）情况下高粱总氮含量最高，高粱的总磷含量随氮、磷浓度的升高而升高，并在施肥处理为4 mmol·L-1氮肥、0。1 mmol·L-1磷肥（N2P2）情况下含量达到最高。研究结果表明，AM真菌吸收氮磷营养的能力存在交互作用。

Effect of arbuscular mycorrhiza on growth and nutrition absorption of sorghum under different nitrogen and phosphorus fertilizer levels

Arbuscular mycorrhiza （AM） was innoculated to the host plant （sorghum） and grown in three compartment pot culture system. With addition of different supply levels of nitrogen and phosphorus fertilizer into the mycelium compartment， the aim of this paper was to investigate the effect of arbuscular mycorrhiza on sorghum growth and nutrition absorption ability. The results showed that the arbuscular mycorrhiza colonization rate reached 70%; the innoculation increased the dry matter and chlorophyll content， and significantly increased the total nitrogen and phosphorus contents of sorghum. In the innoculation of sorghum， the nitrogen content was increased significantly with the increasing N levels， while decreased with the increasing P levels. When in the treatment of 4 mmol·L-1 nitrogen and 001 mmol·L-1 phosphorus （N2P1）， the plant total nitrogen content was the highest. The phosphorus content was increased with the increasing N and P levels， when in the treatment of 4 mmol·L-1 nitrogen and 0。1 mmol·L-1 phosphorus （N2P2）， the plant total phosphorus content was the highest. Wherefore the nutrition absorption of AM fungi was affected by the interaction of nitrogen and phosphorus.