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- Title
土壤剖面碳氮稳定同位素自然丰度 的垂直分布模式及其影响机制.
- Authors
陈淼; 刘顺; 许格希; 史作民
- Abstract
Understanding the changes of natural abundance of stable carbon and nitrogen isotopes (δ13C and δ15N) along soil profile is of great importance in revealing the mechanisms of soil carbon and nitrogen cycling in terrestrial ecosystems. Based on a comprehensive review on the distribution of δ13C and δ15N along soil profile, the mechanisms underlying their vertical distribution were mainly introduced here. There were three mechanisms driving the δ13C vertical distribution in soil profile: 1) historical changes of vegetation δ13C value, 2) changes of C3-C4 species dominance in plant communities, 3) accumulation of 13C-enriched microbial-derived carbon during decomposition. The effects of 13C Suess effect on the vertical distribution of δ13C in soil profile were also discussed. There were four mechanisms underlying the vertical distribution of δ15 N in soil profile: 1) 15N-depletion gas loss during denitrification, 2) accumulation of 15N-enriched microbial-derived nitrogen during decomposition, 3) accumulation of 15N-encriched mycorrhizal fungi residues in deep soil as a result of transferring 15N-depleted nitrogen compounds to plants by mycorrhizae, 4) interaction between soil organic matter and mineral substance. We proposed important concerning points for the future study on vertical distribution of natural abundance of stable carbon and nitrogen isotopes in soil profile.
- Subjects
NITROGEN isotopes; CARBON isotopes; NITROGEN cycle; PLANT communities; NITROGEN in soils
- Publication
Yingyong Shengtai Xuebao, 2021, Vol 32, Issue 6, p1919
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.202106.028