Effects of Different Organic Substitutes on Soil Microbial Community in Dryland Wheat Fields
In order to investigate the effects of different organic substitutes on soil functional microorganisms and functional enzyme genes involved in nitrogen cycling,organic fertilizer(OF)and humic acid(HF)were set up in a long-term location experiment based in the dryland wheat field of Hongtong,Shanxi Province.The results revealed that the changes in the diversity and structure of soil fungal communities were notably more pronounced than those in bacterial communities resulting from various organic substitutes.Net-work analysis showed that different organic substitutes increased the number of edges,nodes,and average neighbors in the microbial co-occurrence network,making the interactions between bacterial communities more complex.The abundance of biological control a-gents for plant pathogens,such as Streptomyces,Paenibacillus,Chaetomium,and Talaromyces,was higher in OF compared to the HF.The abundance of plant pathogenic fungi,Fusarium and Acremonium,showed the lowest abundance in the OF,which was 33%and 37%lower than that in the HF.A total of 11 enzyme genes involved in the nitrogen cycle showed a 47%increase in abundance in the OF compared to the HF.In particular,the abundance of enzyme genes EC 1.7.2.6 and EC 1.7.99.-increased by 126%and 95%in the OF compared to the HF,potentially enhancing nitrogen nutrient availability.In addition,the abundance of potential phosphate-solubilizing microbes also showed an increasing trend in different organic substitute treatments.In conclusion,organic fertilizer substi-tute provides more favorable conditions for dryland wheat growth in southern Shanxi compared to humic acid substitution,making it suitable for regional promotion.
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