Journal
ECOLOGY LETTERS
Volume 21, Issue 8, Pages 1162-1173Publisher
WILEY
DOI: 10.1111/ele.13083
Keywords
Acidification; calcium bridging; density fractionation; mineral sorption; nitrogen enrichment; nitrogen limitation
Categories
Funding
- National Key R&D Program of China [2017YFC0503902]
- Key Project of Nanjing Agricultural University [0306J0743]
- National Natural Science Foundation of China [31600383]
- Fundamental Research Funds [KJQN201743]
- Youth Innovation Promotion Association CAS [2015061]
- China Scholarship Council [201706850012]
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Impacts of reactive nitrogen (N) inputs on ecosystem carbon (C) dynamics are highly variable, and the underlying mechanisms remain unclear. Here, we proposed a new conceptual framework that integrates plant, microbial and geochemical mechanisms to reconcile diverse and contrasting impacts of N on soil C. This framework was tested using long-term N enrichment and acid addition experiments in a Mongolian steppe grassland. Distinct mechanisms could explain effects of N on particulate and mineral-associated soil C pools, potentially explaining discrepancies among previous N addition studies. While plant production predominated particulate C changes, N-induced soil acidification strongly affected mineral-associated C through decreased microbial growth and pH-sensitive associations between iron and aluminium minerals and C. Our findings suggest that effects of N-induced acidification on microbial respiration and geochemical properties should be included in Earth system models that predict ecosystem C budgets under future N deposition/input scenarios.
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