Soil carbon persistence governed by plant input and mineral protection at regional and global scales,Ecology Letters

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Soil carbon persistence governed by plant input and mineral protection at regional and global scales
Ecology Letters ( IF 7.6 ) Pub Date : 2021-03-11 , DOI: 10.1111/ele.13723
Leiyi Chen ₁ , Kai Fang _{1,

2} , Bin Wei _{1,

2} , Shuqi Qin _{1,

2} , Xuehui Feng _{1,

2} , Tianyu Hu ₁ , Chengjun Ji ₃ , Yuanhe Yang _{1,

2}

Affiliation

Elucidating the processes underlying the persistence of soil organic matter (SOM) is a prerequisite for projecting soil carbon feedback to climate change. However, the potential role of plant carbon input in regulating the multi‐layer SOM preservation over broad geographic scales remains unclear. Based on large‐scale soil radiocarbon (∆¹⁴C) measurements on the Tibetan Plateau, we found that plant carbon input was the major contributor to topsoil carbon destabilisation despite the significant associations of topsoil ∆¹⁴C with climatic and mineral variables as well as SOM chemical composition. By contrast, mineral protection by iron–aluminium oxides and cations became more important in preserving SOM in deep soils. These regional observations were confirmed by a global synthesis derived from the International Soil Radiocarbon Database (ISRaD). Our findings illustrate different effects of plant carbon input on SOM persistence across soil layers, providing new insights for models to better predict multi‐layer soil carbon dynamics under changing environments.

中文翻译：

在区域和全球范围内，土壤碳的持久性受植物投入和矿物保护的支配

阐明土壤有机质（SOM）持久性的过程是将土壤碳反馈预测为气候变化的前提。但是，尚不清楚植物碳输入在调节广泛的地理范围内的多层SOM保存中的潜在作用。根据青藏高原的大规模土壤放射性碳（∆ ¹⁴ C）测量，我们发现尽管表土∆ ¹⁴显着相关，但植物碳输入是造成表土碳失稳的主要因素。C具有气候和矿物变量以及SOM化学成分。相比之下，铁-铝的氧化物和阳离子对矿物质的保护在保持深层土壤中的SOM方面变得更加重要。这些区域性观察得到了国际土壤放射性碳数据库（ISRaD）的全球综合证实。我们的发现说明了植物碳输入对土壤层中SOM持久性的不同影响，为模型提供了新见识，从而可以更好地预测环境变化下的多层土壤碳动态。

更新日期：2021-04-14

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