Avni Malhotra, Jessica A M Moore, Samantha Weintraub-Leff, Katerina Georgiou, Asmeret Asefaw Berhe, Sharon A Billings, Marie-Anne de Graaff, Jennifer M Fraterrigo, A Stuart Grandy, Emily Kyker-Snowman, Mingzhen Lu, Courtney Meier, Derek Pierson, Shersingh Joseph Tumber-Dávila, Kate Lajtha, William R Wieder, Robert B Jackson
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引用次数: 0
Abstract
Increasing fine root carbon (FRC) inputs into soils has been proposed as a solution to increasing soil organic carbon (SOC). However, FRC inputs can also enhance SOC loss through priming. Here, we tested the broad-scale relationships between SOC and FRC at 43 sites across the US National Ecological Observatory Network. We found that SOC and FRC stocks were positively related with an across-ecosystem slope of 7 ± 3 kg SOC m-2 per kg FRC m-2, but this relationship was driven by grasslands. Grasslands had double the across-ecosystem slope while forest FRC and SOC were unrelated. Furthermore, deep grassland soils primarily showed net SOC accrual relative to FRC input. Conversely, forests had high variability in whether FRC inputs were related to net SOC priming or accrual. We conclude that while FRC increases could lead to increased SOC in grasslands, especially at depth, the FRC-SOC relationship remains difficult to characterize in forests.
增加土壤细根碳(FRC)输入是提高土壤有机碳(SOC)的有效途径。然而,FRC输入也可以通过启动增加SOC损失。在美国国家生态观测站网络的43个站点上,我们测试了SOC和FRC之间的大尺度关系。土壤有机碳储量与土壤有机碳储量与生态系统坡度(7±3 kg SOC m-2 / kg FRC m-2)呈正相关,但这种关系受草地驱动。草地的跨生态系统坡度是草地的两倍,而森林的FRC和SOC不相关。深层草地土壤主要表现为净SOC累积相对于FRC输入。相反,森林在FRC投入是否与净SOC启动或累积有关方面具有很高的可变性。我们的结论是,虽然FRC的增加会导致草地SOC的增加,特别是在深度,但在森林中FRC-SOC的关系仍然难以表征。
期刊介绍:
Communications Earth & Environment is an open access journal from Nature Portfolio publishing high-quality research, reviews and commentary in all areas of the Earth, environmental and planetary sciences. Research papers published by the journal represent significant advances that bring new insight to a specialized area in Earth science, planetary science or environmental science.
Communications Earth & Environment has a 2-year impact factor of 7.9 (2022 Journal Citation Reports®). Articles published in the journal in 2022 were downloaded 1,412,858 times. Median time from submission to the first editorial decision is 8 days.