Long‐term nitrogen fertilization decreases bacterial diversity and favors the growth of Actinobacteria and Proteobacteria in agro‐ecosystems across the globe

放线菌门 农学 酸杆菌 人类受精 蛋白质细菌 生物 土壤有机质 土壤pH值 生态系统 土壤碳 生态学 土壤水分 细菌 16S核糖体RNA 遗传学
作者
Zhongmin Dai,Weiqin Su,Huaihai Chen,Albert Barberán,Haochun Zhao,Mengjie Yu,Lu Yu,Philip C. Brookes,Christopher W. Schadt,Scott X. Chang,Jianming Xu
出处
期刊:Global Change Biology [Wiley]
卷期号:24 (8): 3452-3461 被引量:609
标识
DOI:10.1111/gcb.14163
摘要

Abstract Long‐term elevated nitrogen (N) input from anthropogenic sources may cause soil acidification and decrease crop yield, yet the response of the belowground microbial community to long‐term N input alone or in combination with phosphorus (P) and potassium (K) is poorly understood. We explored the effect of long‐term N and NPK fertilization on soil bacterial diversity and community composition using meta‐analysis of a global dataset. Nitrogen fertilization decreased soil pH , and increased soil organic carbon (C) and available N contents. Bacterial taxonomic diversity was decreased by N fertilization alone, but was increased by NPK fertilization. The effect of N fertilization on bacterial diversity varied with soil texture and water management, but was independent of crop type or N application rate. Changes in bacterial diversity were positively related to both soil pH and organic C content under N fertilization alone, but only to soil organic C under NPK fertilization. Microbial biomass C decreased with decreasing bacterial diversity under long‐term N fertilization. Nitrogen fertilization increased the relative abundance of Proteobacteria and Actinobacteria , but reduced the abundance of Acidobacteria , consistent with the general life history strategy theory for bacteria. The positive correlation between N application rate and the relative abundance of Actinobacteria indicates that increased N availability favored the growth of Actinobacteria . This first global analysis of long‐term N and NPK fertilization that differentially affects bacterial diversity and community composition provides a reference for nutrient management strategies for maintaining belowground microbial diversity in agro‐ecosystems worldwide.
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