Linkage between temperature sensitivity of SOM decomposition and microbial communities depends on soil fractions,Global Change Biology

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Linkage between temperature sensitivity of SOM decomposition and microbial communities depends on soil fractions
Global Change Biology ( IF 10.8 ) Pub Date : 2024-08-07 , DOI: 10.1111/gcb.17456
Shuqi Qin _{1,

2} , Kai Fang _{1,

3,

4} , Yutong Song _{1,

2,

5} , Luyao Kang _{1,

2,

5} , Siyu Wang _{1,

2,

5} , Yuanhe Yang _{1,

2,

5}

Affiliation

The magnitude of terrestrial carbon (C)‐climate feedback largely depends on the temperature sensitivity of soil organic matter (SOM) decomposition (Q10). However, our understanding of determinants of Q10 for SOM fractions such as particulate and mineral‐associated organic matter (POM and MAOM, respectively) is still inadequate. Particularly, it remains unclear whether microbial effects on Q10 are fraction‐dependent, which induces large uncertainties in projecting soil C dynamics. Here, we conducted large‐scale topsoil sampling on the Tibetan Plateau, in combination with SOM fractionation and 300‐day laboratory incubation to assess SOM fraction‐dependent linkages between Q10 and microbial properties. We found that compared with MAOM, POM had larger Q10 and greater microbial diversity, and also structured distinct microbial communities as well as their co‐occurrence patterns. Furthermore, associations of Q10 with microbial properties differed between the two SOM fractions. Bacterial community composition and relative abundance of bacterial keystone taxa affected Q10 for POM and MAOM respectively, while bacterial alpha diversity showed opposite relationships with Q10 for POM and MAOM. These findings highlight the necessity of incorporating SOM fraction‐dependent microbial properties and their linkages with Q10 into Earth system models to accurately predict terrestrial C‐climate feedback.

中文翻译：

SOM 分解的温度敏感性与微生物群落之间的联系取决于土壤成分

陆地碳（C）-气候反馈的大小很大程度上取决于土壤有机质（SOM）分解的温度敏感性（问10 ）。然而，我们对决定因素的理解问10对于颗粒物和矿物相关有机物（分别为 POM 和 MAOM）等 SOM 组分的分析仍然不足。特别是，目前尚不清楚微生物是否会影响问10是分数相关的，这在预测土壤碳动态时产生很大的不确定性。在这里，我们在青藏高原进行了大规模表土采样，结合 SOM 分馏和 300 天的实验室培养，以评估 SOM 分数依赖性之间的联系问10和微生物特性。我们发现，与MAOM相比，POM具有更大的问10和更大的微生物多样性，并且还构建了不同的微生物群落及其共现模式。此外，协会问10两种 SOM 组分之间的微生物特性不同。受影响的细菌群落组成和细菌关键类群的相对丰度问10分别为 POM 和 MAOM，而细菌 α 多样性与问10对于 POM 和 MAOM。这些发现强调了纳入 SOM 分数依赖性微生物特性及其与问10进入地球系统模型以准确预测陆地气候反馈。

更新日期：2024-08-07

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