生物
栎
反硝化细菌
丰度(生态学)
氮气循环
树木健康
硝化作用
土壤pH值
生态学
生物地球化学循环
无梗花栎
土壤水分
农学
自行车
营养物
相对物种丰度
营养循环
反硝化
氮气
林业
物理
地理
量子力学
作者
Kelly Scarlett,Sandra Denman,Dave R. Clark,Jack Forster,Elena Vanguelova,Nigel L. Brown,Corinne Whitby
出处
期刊:The ISME Journal
[Springer Nature]
日期:2020-10-16
卷期号:15 (3): 623-635
被引量:62
标识
DOI:10.1038/s41396-020-00801-0
摘要
Tree decline is a global concern and the primary cause is often unknown. Complex interactions between fluctuations in nitrogen (N) and acidifying compounds have been proposed as factors causing nutrient imbalances and decreasing stress tolerance of oak trees. Microorganisms are crucial in regulating soil N available to plants, yet little is known about the relationships between soil N-cycling and tree health. Here, we combined high-throughput sequencing and qPCR analysis of key nitrification and denitrification genes with soil chemical analyses to characterise ammonia-oxidising bacteria (AOB), archaea (AOA) and denitrifying communities in soils associated with symptomatic (declining) and asymptomatic (apparently healthy) oak trees (Quercus robur and Q. petraea) in the United Kingdom. Asymptomatic trees were associated with a higher abundance of AOB that is driven positively by soil pH. No relationship was found between AOA abundance and tree health. However, AOA abundance was driven by lower concentrations of NH4+, further supporting the idea of AOA favouring lower soil NH4+ concentrations. Denitrifier abundance was influenced primarily by soil C:N ratio, and correlations with AOB regardless of tree health. These findings indicate that amelioration of soil acidification by balancing C:N may affect AOB abundance driving N transformations, reducing stress on declining oak trees.
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