Microbial nitrogen transformations in tundra soil depend on interactive effects of seasonality and plant functional types

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Biogeochemistry Pub Date : 2024-08-30 DOI:10.1007/s10533-024-01176-6
Marianne Koranda, Anders Michelsen
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Abstract

Nitrogen (N) cycling in organic tundra soil is characterised by pronounced seasonal dynamics and strong influence of the dominant plant functional types. Such patterns in soil N-cycling have mostly been investigated by the analysis of soil N-pools and net N mineralisation rates, which, however, yield little information on soil N-fluxes. In this study we investigated microbial gross N-transformations, as well as concentrations of plant available N-forms in soils under two dominant plant functional types in tundra heath, dwarf shrubs and mosses, in subarctic Northern Sweden. We collected organic soil under three dwarf shrub species of distinct growth form and three moss species in early and late growing season. Our results showed that moss sites were characterised by significantly higher microbial N-cycling rates and soil N-availability than shrub sites. Protein depolymerisation, the greatest soil N-flux, as well as gross nitrification rates generally did not vary significantly between early and late growing season, whereas gross N mineralisation rates and inorganic N availability markedly dropped in late summer at most sites. The magnitude of the seasonal changes in N-cycling, however, clearly differed among plant functional types, indicating interactive effects of seasonality and plant species on soil N-cycling. Our study highlights that the spatial variation and seasonal dynamics of microbial N transformations and soil N availability in tundra heath are intimately linked with the distinct influence of plant functional types on soil microbial activity and the plant species-specific patterns of nutrient uptake and carbon assimilation. This suggests potential strong impacts of future global change-induced shifts in plant community composition on soil N-cycling in tundra ecosystems.

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苔原土壤中的微生物氮转化取决于季节性和植物功能类型的交互影响
有机苔原土壤的氮(N)循环具有明显的季节动态特征,并受到主要植物功能类型的强烈影响。土壤氮循环的这种模式主要是通过分析土壤氮库和净氮矿化率来研究的,但这些方法对土壤氮通量的研究很少。在这项研究中,我们调查了瑞典北部亚北极地区苔原石楠林两种主要植物功能类型--矮灌木和苔藓--下土壤中的微生物氮转化总量以及植物可利用氮形式的浓度。我们在生长季节的早期和晚期采集了三种不同生长形态的矮灌木和三种苔藓下的有机土壤。结果表明,苔藓生长地的微生物氮循环率和土壤氮利用率明显高于灌木生长地。蛋白质解聚是最大的土壤氮通量,总硝化率在生长季初期和后期一般没有显著变化,而在大多数地点,总氮矿化率和无机氮可用性在夏末明显下降。然而,不同植物功能类型的氮循环季节变化幅度明显不同,这表明季节性和植物物种对土壤氮循环具有交互影响。我们的研究强调,苔原石楠中微生物氮转化和土壤氮供应的空间变化和季节动态与植物功能类型对土壤微生物活动的独特影响以及植物物种特有的养分吸收和碳同化模式密切相关。这表明,未来全球变化引起的植物群落组成变化可能会对冻原生态系统的土壤氮循环产生强烈影响。
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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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