Soil carbon storage informed by particulate and mineral-associated organic matter
Soil carbon storage informed by particulate and mineral-associated organic matter
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DOI：
10.1038/s41561-019-0484-6
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发表时间：
2019-12-01
影响因子：
18.3
通讯作者：
Lugato, Emanuele
中科院分区：
文献类型：
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作者：
Cotrufo, M. Francesca;Ranalli, Maria Giovanna;Lugato, Emanuele
缓解气候变化的有效陆地解决方案需要采取行动，最大限度地增加土壤碳储存，而不产生多余的氮。碳固存的土地管理最常依据的是土壤碳总量清单，而不考虑碳的储存形式、储存能力、持久性和氮需求。在这里，我们将欧洲范围的数据库与土壤有机质物理分馏相结合，以确定大陆规模的森林和草原表土碳和氮储量及其在矿物相关和颗粒有机质库之间的分布。草地和丛枝菌根森林将更多的土壤碳储存在矿物相关的有机碳中，这种有机碳更持久，但对氮的需求更高，并且饱和。外生菌根森林在颗粒有机物中储存更多的碳，这更容易受到干扰，但对氮的需求较低，并可能无限期地积累。矿物伴生有机物和颗粒有机物之间的碳份额以及碳和氮之间的比例影响土壤碳储量，并介导其他变量对土壤碳储量的影响。了解矿物相关有机物与颗粒有机物池中有机物的物理分布可以为土地管理提供信息，以实现氮高效的碳固存，这应该由生态系统中固有的土壤碳容量和氮可用性驱动。
Effective land-based solutions to climate change mitigation require actions that maximize soil carbon storage without generating surplus nitrogen. Land management for carbon sequestration is most often informed by bulk soil carbon inventories, without considering the form in which carbon is stored, its capacity, persistency and nitrogen demand. Here, we present coupling of European-wide databases with soil organic matter physical fractionation to determine continental-scale forest and grassland topsoil carbon and nitrogen stocks and their distribution between mineral-associated and particulate organic matter pools. Grasslands and arbuscular mycorrhizal forests store more soil carbon in mineral-associated organic carbon, which is more persistent but has a higher nitrogen demand and saturates. Ectomycorrhizal forests store more carbon in particulate organic matter, which is more vulnerable to disturbance but has a lower nitrogen demand and can potentially accumulate indefinitely. The share of carbon between mineral-associated and particulate organic matter and the ratio between carbon and nitrogen affect soil carbon stocks and mediate the effects of other variables on soil carbon stocks. Understanding the physical distribution of organic matter in pools of mineral-associated versus particulate organic matter can inform land management for nitrogen-efficient carbon sequestration, which should be driven by the inherent soil carbon capacity and nitrogen availability in ecosystems.