氮和磷添加剂对氮循环微生物丰度和潜力的影响:荟萃分析

IF 4 2区 农林科学 Q2 SOIL SCIENCE
Yuqian Tang, Yanru Jia, Siqin Zhang, Yanjie Zhang
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引用次数: 0

摘要

陆地生态系统中氮(N)和磷(P)利用率的快速增长导致了土壤微生物群落和微生物介导的氮循环的持续变化。然而,人们对氮和磷添加剂对氮循环微生物的具体影响知之甚少。本荟萃分析综述了氮和/或磷添加剂对涉及氮固定、有机氮矿化、硝化和反硝化的氮循环基因的丰度和功能潜力的影响,这些基因涉及中国的自然生态系统和不同的土壤条件。我们的研究结果表明,与氨氧化古细菌(AOA)相比,氨氧化细菌(AOB)对氮肥施用的反应性更强,而且随着磷肥施用量的增加,AOB amoA丰度增加,而AOA amoA丰度降低。此外,nirS 的丰度下降,而 nirK 的丰度对氮和磷的添加均无反应。这些发现突显了具有相同功能的微生物群占据了不同的生态位,以应对氮和磷的添加。此外,我们的研究结果表明,土壤中氮和磷的利用率,以及氮添加剂和微生物生物量碳含量引起的土壤酸化,是调节氮循环基因丰度和潜力的关键因素。氮循环基因及其相应潜能的驱动机制似乎各不相同,基因丰度对功能潜能的影响有限。这表明,与功能基因丰度相比,在氮和磷沉积不断增加的情况下,土壤性质和微生物群落组成等因素可能是氮循环过程更关键的决定因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of nitrogen and phosphorus amendments on nitrogen-cycling microbial abundances and potentials: A meta-analysis

The rapid increase in nitrogen (N) and phosphorus (P) availabilities in terrestrial ecosystems has led to sustained shifts in soil microbial communities and microbially-mediated N-cycling. However, the specific effects of N and P amendments on N-cycling microbes are poorly understood. This meta-analysis synthesizes the effects of N and/or P amendments on the abundances and functional potentials of N-cycling genes involved in N₂ fixation, organic N mineralization, nitrification, and denitrification across natural ecosystems and diverse soil conditions in China. Our findings indicate that ammonia-oxidizing bacteria (AOB) showed greater responsiveness to N amendment than ammonia-oxidizing archaea (AOA), and AOB amoA abundance increased while AOA amoA abundance decreased with P amendments. Additionally, the abundance of nirS declined, while nirK abundance remained unresponsive to both N and P amendments. These findings highlight the distinct ecological niches occupied by microbial groups with equivalent functions in response to N and P amendments. Moreover, our findings indicate that soil N and P availabilities, along with soil acidification induced by N additions and microbial biomass carbon content, are key factors regulating N-cycling gene abundances and potentials. The driving mechanisms for N-cycling genes and their corresponding potentials appear to be distinct, with gene abundance showing only a limited influence on functional potentials. This suggests that factors such as soil properties and microbial community compositions may be more critical determinants of N-cycling processes than functional gene abundances with regard to scenarios of increasing N and P deposition.

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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
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