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| Influences of Arbuscular Mycorrhizal Fungi（AMF） on the Growth, Phosphatase Activities and Radioactive Nuclide Bioconcentration of sorghum haipense at Soil Contaminated with 137Cs |
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| KeyWord:137Cs; arbuscular mycorrhizal fungi（AMF）; growth; sorghum haipense; phosphatase; bioconcentration factor |
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| Abstract: |
| A pot experiment was conducted to investigate the effects of Glomus geosporum（G.g）, Glomus mosseae（G.m）, Glomus versiforme（G.v）, Glomus etunicatum（G.e） and Glomus diaphanum（G.d） on the growth, phosphatase activities and bioconcentration factor of 137Cs in sorghum haipense at soil contaminated with 137Cs. The results showed that G.g, G.m and G.e treatment significantly improved the growth indexes（P<0.05）, including stem diameter, plant height, leaf and root dry weight. Meanwhile, the increase of these growth indexes in G.m treatment was the most significant and the corresponding indexes increased by 25.63%，23.25%，26.07% and 16.73% compared with the control, respectively. The five AMF significantly increased N and K concentration in rhizomes of sorghum haipense and the increase range of the two element concentration was 6.63%~10.84% and 24.28%~29.70%, respectively. The treatment inoculated with G.m significantly increased acid phosphatase（0.31 mg·kg-1·h-1） and alkaline phosphatase activities（0.07 mg·kg-1·h-1）, but reduced the available P concentration of by 3.95 mg·kg-1. In addition, the bioconcentration factor of 137Cs in sorghum haipense treated with G.m, G.e and G.d was 2.79 times, 1.77 times and 1.36 times than that of the control, respectively. Moreover, there was a positive significant correlativity（P<0.01） between bioconcentration factor on 137Cs and acid or alkaline phosphatase activities, but bioconcentration factor of 137Cs exhibited a significant negative correlativity with available P concentration（P<0.01）. Based on our results, the means to repair radionuclide pollution soil by AMF-plant symbiont is very effetive in the future. |
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