Variability in soil and foliar stable carbon and nitrogen isotope compositions in the winter rainfall biomes of South Africa

Carr, Andrew S.; Chase, Brian M.; Boom, Arnoud; Meadows, Michael E.; Medina-Sánchez, Javier

doi:10.1016/j.jaridenv.2022.104726

Cited by 5 publications

(1 citation statement)

References 59 publications

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“…Three global datasets published between 2015 and 2022 (Choi et al., 2020; Craine et al., 2015; Harris et al., 2022) were included in our database after deduplication. Furthermore, we conducted extensive web‐based searches for the datasets (~2022) recording soil δ 15 N across Africa (Baumgartner et al., 2021; Carr et al., 2022; Mosher et al., 2020), America (Marty et al., 2019; Perakis et al., 2015; Sena‐Souza et al., 2020), Asia (Hu et al., 2022; Shan et al., 2019), Europe (Guerrieri et al., 2021; Mullineaux et al., 2022; Thornton et al., 2015), and Oceania (Jones & Dalal, 2017; Rogers et al., 2022; Sommer et al., 2012). Based on the criterion described in the “Data standardization” section, 10188 observations were added to our database (Data S2).…”

Section: Methodsmentioning

confidence: 99%

Global evidence for joint effects of multiple natural and anthropogenic drivers on soil nitrogen cycling

Zhang,

Cheng,

Terrer

et al. 2024

Global Change Biology

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Global soil nitrogen (N) cycling remains poorly understood due to its complex driving mechanisms. Here, we present a comprehensive analysis of global soil δ15N, a stable isotopic signature indicative of the N input–output balance, using a machine‐learning approach on 10,676 observations from 2670 sites. Our findings reveal prevalent joint effects of climatic conditions, plant N‐use strategies, soil properties, and other natural and anthropogenic forcings on global soil δ15N. The joint effects of multiple drivers govern the latitudinal distribution of soil δ15N, with more rapid N cycling at lower latitudes than at higher latitudes. In contrast to previous climate‐focused models, our data‐driven model more accurately simulates spatial changes in global soil δ15N, highlighting the need to consider the joint effects of multiple drivers to estimate the Earth's N budget. These insights contribute to the reconciliation of discordances among empirical, theoretical, and modeling studies on soil N cycling, as well as sustainable N management.

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