Impact of arbuscular mycorrhizal fungi on ecological interception effect of different treatment modes of lead-zinc slag
[Objective]Arbuscular mycorrhizal fungi(AMF),as a symbiotic fungus of most plants,plays a positive role in the enrichment of heavy metals in plants and the improvement of plant tolerance.In the study,the differences and correlation changes of the spore number and infection rate of arbuscular mycorrhizal fungi on soil related indexes,plant growth indexes,root morphology and soil heavy metal loss in different slag treatment modes were analyzed.The effect of AMF on the ecological interception of four treatment modes was revealed.[Method]With koelreuteria as the main test plant,four treatment groups were designed:CK(100%slag),K0(90%slag+5%mushroom slag+5%CaCO3),S(Koelreuteria),CP(Koelreuteria+oleander+vetiver),and the experiment was carried out by simulating the mine glass device system.[Objective]1)The spore density of AMF soil in four slag treatment modes was CP＞S＞K0＞CK,and the change trend base of soil porosity,water content and organic matter content in four slag treatment modes was consistent with the change trend of spore number.Urease and phosphatase increased with the increase of amendments and plant planting,and were positively correlated with the number of spores.The general pattern of catalase was CK＞K0＞CP＞S group,and the difference was significant,and the spore number of AMF was negatively correlated with the four treatment groups.2)There were significant differences in plant height and biomass between group S and group CP,and AMF in group S was significantly correlated with plant biomass.After compound planting,AMF was significantly correlated with plant height,above-ground biomass and total biomass and extremely significantly correlated with subsurface biomass,and plant root morphology was significantly improved.3)The pattern of Pb loss was CK＞K0＞S＞CP,which was negatively correlated with the number of AMF spores.After addition of amendments,soil Pb loss was greatly reduced.After planting koelreuteria the soil loss gradually tended to be stable,and the Zn loss showed a rule of K0＞CK＞S＞CP.After adding the amendment,the number of spores increased and the loss of Zn was higher than that in the blank group.When planting koelreuteria,the AMF increased significantly,the loss of Zn decreased significantly and the stability increased.[Conclusion]AMF can regulate the pH of soil and positively promote the growth and development of plants.Plant complex planting root system is more complex,can promote the growth and spread of AMF and increase the sharing of nutrients and water between plants,and can penetrate deep into the soil to affect the migration and transformation of Pb and Zn elements.The content of Zn and Pb in plants mainly concentrated in the roots,and the correlation between AMF and Zn and Pb flowing into plants was mainly reflected in stems and leaves.The effect of AMF in the underground part on Zn element was significant.In the growth stage of koelteria,the effect of AMF was mainly reflected in improving the migration and transformation of Zn and transporting it to the stems and leaves above ground,but the effect on Pb element was not obvious.
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