Jiaoyun Lu, Hong Tian, Junbo Xiong, Xinjiang Wu, Yang Liu, Heshan Zhang
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引用次数: 0
Abstract
Although nitrifying and N-fixing functional gene microbes play a crucial role in regulating ecosystem nitrogen (N) cycling, understanding of how N and phosphorus (P) fertilization affect their community structure remains limited. N fertilizer levels were set to simulate N deposition and combined with different P fertilizer levels, to explore the soil-root-shoot physiological indexes, and the response of community structure of N-fixing and nitrifying microorganisms that caused changes in the N cycle of the system to fertilization. The results showed that N and P fertilization significantly decreased soil N pool (NH4+-N, NO3--N, IN), the concentrations of shoot TN, root TP, root OC, and root biomass, and slowed down soil N flux (net ammoniation rate, net nitrification rate, and net N mineralization rate). This effect was more pronounced under NP fertilization compared to single N or P fertilization. Short-term N and P fertilization had little effect on AOA and AOB. Anaeromyxobacter is a dominant genus of diazotrophs, and its relative abundance was significantly improved by N fertilization. Fertilization significantly increased Geobacter, but significantly decreased the relative abundance of Zoogloea, Rhizobium, and Azohydromonas. Root biomass and TP, soil NH4+-N, OC, and AP changed by fertilization were the main factors affecting N-fixing microorganisms. This study showed that in addition to soil N, soil OC and P changes caused by fertilization were also important factors affecting the N-cycling microbial community structure. Later relevant studies should also consider the effect of fertilization duration, environmental temperature, soil base condition, etc.
期刊介绍:
Current Microbiology is a well-established journal that publishes articles in all aspects of microbial cells and the interactions between the microorganisms, their hosts and the environment.
Current Microbiology publishes original research articles, short communications, reviews and letters to the editor, spanning the following areas:
physiology, biochemistry, genetics, genomics, biotechnology, ecology, evolution, morphology, taxonomy, diagnostic methods, medical and clinical microbiology and immunology as applied to microorganisms.