Fertilization regulates global thresholds in soil bacteria,Global Change Biology

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Fertilization regulates global thresholds in soil bacteria
Global Change Biology ( IF 10.8 ) Pub Date : 2024-08-17 , DOI: 10.1111/gcb.17466
Cai Chen _{1,

2} , Shu-Le Li _{1,

2} , Qing-Lin Chen _{1,

2,

3} , Manuel Delgado-Baquerizo ₄ , Zhao-Feng Guo _{1,

3} , Fenghua Wang ₅ , Yao-Yang Xu _{1,

3} , Yong-Guan Zhu _{1,

3,

6}

Affiliation

Global patterns in soil microbiomes are driven by non‐linear environmental thresholds. Fertilization is known to shape the soil microbiome of terrestrial ecosystems worldwide. Yet, whether fertilization influences global thresholds in soil microbiomes remains virtually unknown. Here, utilizing optimized machine learning models with Shapley additive explanations on a dataset of 10,907 soil samples from 24 countries, we discovered that the microbial community response to fertilization is highly dependent on environmental contexts. Furthermore, the interactions among nitrogen (N) addition, pH, and mean annual temperature contribute to non‐linear patterns in soil bacterial diversity. Specifically, we observed positive responses within a soil pH range of 5.2–6.6, with the influence of higher temperature (>15°C) on bacterial diversity being positive within this pH range but reversed in more acidic or alkaline soils. Additionally, we revealed the threshold effect of soil organic carbon and total nitrogen, demonstrating how temperature and N addition amount interacted with microbial communities within specific edaphic concentration ranges. Our findings underscore how complex environmental interactions control soil bacterial diversity under fertilization.

中文翻译：

施肥调节土壤细菌的总体阈值

土壤微生物组的全球模式是由非线性环境阈值驱动的。众所周知，施肥可以塑造全球陆地生态系统的土壤微生物组。然而，施肥是否影响土壤微生物组的全球阈值仍然未知。在这里，我们利用优化的机器学习模型和 Shapley 附加解释对来自 24 个国家的 10,907 个土壤样本的数据集进行分析，发现微生物群落对施肥的反应高度依赖于环境背景。此外，氮 (N) 添加量、pH 值和年平均温度之间的相互作用会导致土壤细菌多样性的非线性模式。具体来说，我们在 5.2-6.6 的土壤 pH 范围内观察到了积极的反应，较高的温度 (>15°C) 对细菌多样性的影响在此 pH 范围内呈正向，但在酸性或碱性较高的土壤中则相反。此外，我们揭示了土壤有机碳和总氮的阈值效应，展示了温度和氮添加量如何在特定土壤浓度范围内与微生物群落相互作用。我们的研究结果强调了复杂的环境相互作用如何控制施肥下的土壤细菌多样性。

更新日期：2024-08-17

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