Macroecology Differentiation Between Bacteria and Fungi in Topsoil Across the United States
Macroecology Differentiation Between Bacteria and Fungi in Topsoil Across the United States
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DOI：
10.1029/2023gb007706
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发表时间：
2023-10
影响因子：
5.2
通讯作者：
Liyuan He;N. Viovy;Xiaofeng Xu
中科院分区：
文献类型：
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作者：
Liyuan He;N. Viovy;Xiaofeng Xu
细菌和真菌具有不同的生理特性。它们的宏观生态对生态系统的功能至关重要，例如碳循环。然而，细菌和真菌的生物地理学和潜在的机制仍然难以捉摸。在这项研究中，我们通过集成微生物显式模型CLM-Microbe与34个霓虹灯站点的真菌(FBC)和细菌生物量碳(BBC)的测量来研究细菌和真菌的宏观生态。菌落总数、体细胞数和体细胞数(F：B)的分布可以很好地模拟，99%(P<；0.001)、97%(P<；0.001)和99%(P<；0.001)的变化可以用CLM-Microbe模型来解释。我们发现，与BBC相比，全美FBC的生物地理模式更强。真菌和细菌的周转率在纬度上表现出类似的趋势。然而，其组成通量(碳同化、呼吸和坏死体产生)的纬向趋势在细菌和真菌之间是不同的，这些纬向趋势对真菌遵循相反的单峰模式，对细菌表现出指数下降的响应。碳的同化作用主要受植被生产力的影响，呼吸作用受细菌和真菌的年平均温度影响。它们产生大量死亡的主导因素不同，土壤因素控制真菌，年平均温度控制细菌过程。了解真菌和细菌的宏观生态是将微生物代谢和土壤生物地球化学过程联系起来的重要一步。不同的真菌和细菌宏观生态对微生物生态有贡献，特别是在微生物群落结构及其与空间生态系统碳循环的关系上。
Bacteria and fungi possess distinct physiological traits. Their macroecology is vital for ecosystem functioning such as carbon cycling. However, bacterial and fungal biogeography and underlying mechanisms remain elusive. In this study, we investigated bacterial versus fungal macroecology by integrating a microbial‐explicit model—CLM‐Microbe—with measured fungal (FBC) and bacterial biomass carbon (BBC) from 34 NEON sites. The distribution of FBC, BBC, and FBC: BBC (F:B) ratio was well simulated across sites, with variations in 99% (P < 0.001), 97% (P < 0.001), and 99% (P < 0.001) being explained by the CLM‐Microbe model, respectively. We found stronger biogeographic patterns of FBC relative to BBC across the United States. Fungal and bacterial turnover rates showed similar trends along latitude. However, latitudinal trends of their component fluxes (carbon assimilation, respiration, and necromass production) were distinct between bacteria and fungi, with those latitudinal trends following inverse unimodal patterns for fungi and showing exponential declining responses for bacteria. Carbon assimilation was dominated by vegetation productivity, and respiration was dominated by mean annual temperature for bacteria and fungi. The dominant factor for their necromass production differs, with edaphic factors controlling fungal and mean annual temperature controlling bacterial processes. The understanding of fungal and bacterial macroecology is an important step toward linking microbial metabolism and soil biogeochemical processes. Distinct fungal and bacterial macroecology contributes to the microbial ecology, particularly on microbial community structure and its association with ecosystem carbon cycling across space.