《Nature communications》| 植物根系增强了北方森林土壤中的分解和稳定的有机物形成

摘要：北方森林是具有低氮（N）可用性的生态系统，在全球范围内主要存储的大量碳（C），这些碳主要存在于植物生物量和土壤有机质（SOM）中。尽管对于未来的气候变化预测至关重要，但控制碳和氮库的机制仍未得到很好的理解。本研究中，我们实施了一个为期三年的实验，比较了存在根与排除了根但存在真菌菌丝以及排除了根和真菌菌丝处理的SOM分解和稳定性。与根系排斥处理相比，根系加速了SOM分解，但与无机土壤N（伴有稳定的SOM-N的形成）相比，有机土壤中N的浓度更高。相反，根系排斥会导致无机土壤氮汇聚（即无机氮含量高），同时降低了稳定的SOM-N积累。在本研究中，我们提供了一个植物根系如何影响SOM分解和稳定的框架。

Abstract:  Boreal forests are ecosystems with low nitrogen (N) availability that store globally significant amounts of carbon (C), mainly in plant biomass and soil organic matter (SOM). Although crucial for future climate change predictions, the mechanisms controlling boreal C and N pools are not well understood. Here, using a three-yearfield experiment, we compare SOM decomposition and stabilization in the presence of roots, with exclusion of roots but presence of fungal hyphae and with exclusion of both roots and fungal hyphae. Roots accelerate SOM decomposition compared to the root exclusion treatments, but also promote a different soil N economy with higher concentrations of organic soil N compared to inorganic soil N accompanied with the build-up of stable SOM-N. In contrast, root exclusion leads to an in organic soil N economy (i.e., high level of inorganic N) with reduced stable SOM-N build-up. Based on our findings, we provide a framework on how plant roots affect SOM decom-position and stabilization.

《Nature communications》为nature集团旗下的子刊，最新影响因子为12.121，是在线出版的多学科杂志，专门发表生物学、物理学和化学等各领域的高质量研究论文。

原文链接：

https://doi.org/10.1038/s41467-019-11993-1

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