外源菌根对重金属胁迫下的香根草营养品质的影响

通过盆栽试验，探讨在添加外援菌根的情况下，重金属胁迫下的香根草作为牧草营养品质的变化。试验设计重金属污染水平为锌800mg／kg、镉10mg／kg，外源菌根为为摩西球囊霉、幼套球囊霉和聚丛球囊霉。试验结果表明，外源菌根对重金属污染土壤香根草灰分含量影响不大；与对照相比，除摩西球囊霉处理香根草植株内粗蛋白含量下降外，其他处理均有所升高；与单纯重金属锌镉胁迫相比，摩西球囊霉处理粗蛋白表现出了下降而幼套球囊霉和聚丛球囊霉处理出现上升的趋势；对照处理香根草中磷的含量高于其他处理，且显著高于未添加菌根处理；同等重金属胁迫下，三组添加外源菌根处理植株内磷含量均有增加趋势；在所有处理中，对照处理内的钙含量最低。

Effect of Exogenous Mycorrhiza on Nutrient Quality of Vetiveria Zizanioides in Heavy Metal Contaminated Soils

By soil incubation experiment,as heavy metals stress,the nutrient qualities variation of Vetiveria zizanioides with the addition of exogenous mycorrhiza were studied.The levels of heavy metal pollution were that Zn was 800mg/kg,Cd was 10mg/kg,the exogenous mycorrhizas were G.mosseae,G.etunicatum and gloms aggregatum.The experiment results showed that,exogenous mycorrhizas had not big influence on ash content of Vetiveria zizanioides in heavy metal contaminated soils;Compared to contrast,the crude protein content of the other treatments were increased except for the G.moosseae treatment;Compared to the simple heavy metal stress,the crude protein content with addition of G.mosseae treatment decreased,and the crude protein content with addition of G.etunicatum and gloms aggregatum had ascend trend;The P content of contrast treatment was higher than the other treatments,and was higer significant than without the treatments mycorrhiza;With the same heavy metal stress,all of the P contents with the addition of exogenous mycorrhiza had ascend trend;The Ca of contrast treatment content was minimum among all the treatments.