N-cycle gene abundance determination of N mineralization rate following re-afforestation in the Loess Plateau of China
作者机构：College of AgronomyNorthwest A&F UniversityYangling 712100China Shaanxi Engineering Research Center of Circular AgricultureCollege of AgronomyNorthwest A&F UniversityYangling 712100China
出 版 物：《Soil Ecology Letters》 (土壤生态学快报（英文）)
年 卷 期：2024年第6卷第1期
页 面：97-106页
核心收录：
学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学]
基 金：supported by the National Natural Science Foundation of China(No.41907031) the China Postdoctoral Science Foundation(No.2021T140565) the China Postdoctoral Science Foundation(No.2019M650276)
主 题：afforestation soil N mineralization rate denitrification genes nitrification genes the Loess Plateau
摘 要：Afforestation effectively improved soil microbial communities and significantly increased soil nitro-gen mineralization rate(Rm).Soil microorganisms drive Rm by regulating soil N-cycling *** nitrification genes had a major effect on soil Rm than denitrification genes after *** the function of forest ecosystems requires an understanding of the mechanism of soil nitrogen ***,it remains unclear how soil N-cycling genes drive soil nitrogen mineralization during *** this study,we collected soil samples from a chrono-sequence of 14,20,30,and 45 years of Robinia pseudoacacia L.(RP14,RP20,RP30,and RP45)with a sloped farmland(FL)as a *** metagenomic sequencing analysis,we found significant changes in the diversity and composition of soil microbial communities involved in N-cycling along the afforestation time series,with afforestation effectively increasing the diversity(both alpha and beta diversity)of soil microbial *** conducted indoor culture experiments and analyzed correlations,which revealed a significant increase in both soil nitrification rate(Rn)and soil nitrogen mineralization rate(Rm)with increasing stand ***,we found a strong correlation between soil Rm and soil microbial diversity(both alpha and beta diversity)and with the abundance of soil N-cycling *** least squares path modeling(PLS-PM)analysis showed that nitrification genes(narH,narY,nxrB,narG,narZ,nxrA,hao,pmoC-amoC)and denitrification genes(norB,nosZ,nirK)had a greater direct effect on soil Rm compared to their effect on soil microbial *** results reveal the relationships between soil nitrogen mineralization rate and soil microbial communities and between the mineralization rate and functional genes involved in N-cycling,in the context of Robinia pseudoacacia *** on the Loess *** study enriches the understanding of the effects of microorganisms on soil nitrogen mineraliza
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