关键词:
metagenomics
microbial function
farmland
nutrient cycling
Loess Plateau
摘要:
Background,aim,and scope Soil microbes are important drivers of nutrient transformation and energy f *** forest land for agricultural use may have profound effects on soil properties and microbial ***,the response of soil microbial communities to soil reclamation in the dryland agroecosystem is less ***,it is necessary to investigate the changes of soil microbial communities driven by land use conversion to promote nutrient cycling in reclaimed *** and methods Based on the metagenomic technique,we evaluated the microbial composition and function of the newly created farmland(NF)after reclamation with two types of traditional farmland(slope farmland(SF),checkdam farmland(CF))on the Loess Plateau,and explored the response of nutrient cycling function to dominant genera and soil *** The results showed that Proteobacteria,Actinobacteria,and Acidobacteria were prevalent in the three types of *** with SF and CF,NF increased the relative abundance of Actinobacteria and Nocardioides,as well as genes related to amino acid metabolism and carbohydrate *** relative abundance of functional genes related to carbon and nitrogen cycling in the NF was higher than that in the traditional farmland(SF and CF).The relative abundance of nutrient cycling functional genes was positively correlated with dominant genera in the three types of *** for pH,soil physicochemical factors were negatively correlated with genes related to amino acid metabolism and carbon *** Previous studies have shown that the nutrient conditions of the soil may intensify the competition between the eutrophic and oligotrophic microbial *** long-term cultivation and fertilization,the soil properties of traditional farmland were significantly different from those of NF,leading to the differentiation of dominant microbial *** usually have functional redundancy to cope wi