Differential impacts of nitrogen addition on soil dissolved organic carbon in humid and non-humid regions: A global meta-analysis

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dc.contributor.authorRen, Tianjing
dc.contributor.authorSmreczak, Bożena
dc.contributor.authorUkalska-Jaruga, Aleksandra
dc.contributor.authorLi, Xiaojie
dc.contributor.authorHassa, Wassem
dc.contributor.authorCai, Andong
dc.date.accessioned2025-03-21T12:35:15Z
dc.date.available2025-03-21T12:35:15Z
dc.date.issued2025-03-01
dc.description.abstractSoil dissolved organic carbon (DOC) is the most active carbon pool, providing essential carbon and energy to soil microorganisms while playing a crucial role in carbon sequestration, transport, and stabilization in soils. Nitrogen (N) addition, a key factor influencing terrestrial carbon cycling, can significantly alter soil DOC dynamics. However, the global patterns and underlying drivers of DOC responses to N addition, particularly across regions with varying aridity indices, remain unclear. This study analyzed 1132 paired observations from 103 independent studies to quantify the response pattern of DOC to N addition in humid (554 observations) and non-humid (574 observations) regions and identify the factors driving these effects. The findings revealed an asymmetrical effect of N addition on soil DOC between humid and non-humid regions, rather than on microbial biomass carbon (MBC) or soil organic carbon (SOC). Specifically, N addition significantly decreased soil DOC (􀀀 2.49%) in humid regions, while it increased DOC (7.30%) in non-humid regions. The effect size of soil DOC decreased linearly with the ratio of MBC to SOC in humid regions but increased linearly in non-humid regions. In humid regions, soil DOC response was positively correlated with initial MBC and inversely correlated with initial soil pH, whereas the opposite trend was observed in non-humid regions. Seasonal precipitation variability was identified as a significant driver of soil DOC response, independent of temperature, soil properties, and N addition rates. Moreover, initial SOC content was the primary driving factor for soil DOC response in humid regions, while the N addition rates were the primary driver in non-humid regions. These findings have important implications for enhancing soil carbon pool management, improving global carbon models, and addressing climate change, particularly under varying climatic conditions.
dc.description.sponsorshipThe European Joint Project COFUND (EJP SOIL) –“Towards climate-smart sustainable management of agricultural soils” (862695) and the National Science & Technology Fundamental Resources Investigation Project of China (2022FY100500) financially supported this work.
dc.identifier.citationJournal of Environmental Management 377 (2025) 124744
dc.identifier.doi10.1016/j.jenvman.2025.124744
dc.identifier.issn0301-4797
dc.identifier.urihttps://bc.iung.pl/handle/123456789/3257
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofseries377 (2025) 124744
dc.subjectsoil dissolved organic carbon
dc.subjectnitrogen addition
dc.subjecthumid regions
dc.subjectnon-humid regions
dc.subjectdriving factors
dc.titleDifferential impacts of nitrogen addition on soil dissolved organic carbon in humid and non-humid regions: A global meta-analysis
dc.typeArticle
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