Abstract
This review analyzes the data on co-variations in δ13C and δ15N of soils with land-use types, management, and disturbance obtained from literature to explore potential implications of the dual isotopes in the study of soil organic matter (SOM) sources and C and N processes. Overall, croplands (δ13C and δ15N were − 20.3 ± 4.4‰ and + 7.6 ± 4.4‰, respectively) had greater isotopic values than grasslands (‒26.3 ± 3.0‰ and + 5.4 ± 1.1‰, respectively) and forests (− 26.0 ± 1.1‰ and + 4.3 ± 2.2‰, respectively). For intensively managed lands such as croplands and grasslands, application of organic inputs such as manure and compost of which isotopic signatures differed from the indigenous SOM was the main driver of co-variations in the δ13C and δ15N of SOM. For natural forests, both δ13C and δ15N of SOM co-increased with soil depth, reflecting heavy isotope enrichment during microbial stabilization of SOM and the potential influence of 13C-depleted atmospheric CO2 and 15N-depleted N deposition on the upper soils. Such vertical co-enrichments of 13C and 15N were disturbed by a land-use conversion to other lands including croplands. Though there were indications that land management practices such as tillage in croplands and grazing in grasslands, land-use changes, and land disturbance including forest fire might also affect both δ13C and δ15N, more data need to be accumulated to find a general trend of the isotopic variations of SOM. Analysis of both δ13C and δ15N may enlarge understanding of changes in SOM sources and soil C and N cycling by land-use types, management, change, and disturbance.
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This work was carried out with the support of the “Cooperative Research Program for Agriculture Science and Technology Development (Project No. PJ01336802)”, Rural Development Administration, Republic of Korea.
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Hyun-Jin Park: investigation, data curation, writing — original draft. Nuri Baek: investigation, data curation, writing — original draft. Sang-Sun Lim: investigation, data curation, writing – original draft. Young-Jae Jeong: investigation, data curation. Bo-Seong Seo: investigation, data curation. Jin-Hyeob Kwak: investigation, data curation. Sang-Mo Lee: writing — review and editing. Seok-In Yun: writing — review and editing, funding acquisition. Han-Yong Kim: writing — review and editing, funding acquisition. Muhammad A. Arshad: writing — review and editing. Woo-Jung Choi: Supervision, funding acquisition, writing — review and editing.
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Park, HJ., Baek, N., Lim, SS. et al. Coupling of δ13C and δ15N to understand soil organic matter sources and C and N cycling under different land-uses and management: a review and data analysis. Biol Fertil Soils 59, 487–499 (2023). https://doi.org/10.1007/s00374-022-01668-3
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DOI: https://doi.org/10.1007/s00374-022-01668-3