文献类型：期刊文献

中文题名：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

英文题名：Vertical distribution of natural abundance of stable carbon and nitrogen isotopes along the soil profile and the underlying mechanisms

作者：陈淼[1,2] 刘顺[1,2] 许格希[1,2] 史作民[1,2,3]

第一作者：陈淼

机构：[1]中国林业科学研究院森林生态环境与保护研究所国家林业和草原局森林生态环境重点实验室,北京100091;[2]四川米亚罗森林生态系统定位观测研究站,四川理县623100;[3]南京林业大学南方现代林业协同创新中心,南京210037

年份：2021

卷号：32

期号：6

起止页码：1919-1927

中文期刊名：应用生态学报

外文期刊名：Chinese Journal of Applied Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；PubMed;

基金：中央级公益性科研院所基本科研业务费专项(CAFYBB2018ZA003);国家重点研发计划项目(2016YFC0502104-02)资助。

语种：中文

中文关键词：土壤剖面;碳稳定同位素;氮稳定同位素;同位素分馏;垂直分布

外文关键词：soil profile;carbon stable isotope;nitrogen stable isotope;isotopic fractionation;vertical distribution

分类号：S153.6

摘要：土壤碳、氮稳定同位素自然丰度(δ^(13)C和δ^(15)N)随土壤深度变化的研究,对揭示碳、氮元素生物地球化学循环机制具有重要意义。本文在概述土壤剖面δ^(13)C和δ^(15)N)垂直分布特征的基础上,重点介绍了土壤δ^(13)C和δ^(15)N)垂直分布模式的影响机制。土壤剖面δ^(13)C垂直分布模式的影响机制主要有3种:1)植被δ^(13)C值的历史变化;2)植物群落C3-C4植物优势度变化;3)分解过程中^(13)C富集的微生物源碳的积累。此外,讨论了^(13)C休斯效应对土壤剖面δ^(13)C垂直分布模式的影响。土壤剖面δ^(15)N)垂直分布模式的影响机制主要有4种:1)反硝化过程产生的^(15)N贫化气体的损失;2)分解过程中^(15)N富集的微生物源氮的积累;3)菌根将^(15)N贫化的含氮化合物转移到植物而在深层土壤积累^(15)N富集的菌根真菌残留物;4)土壤有机质-矿物相互作用。最后提出了未来土壤剖面碳、氮稳定同位素自然丰度的垂直分布模式研究应该关注的重点。
Understanding the changes of natural abundance of stable carbon and nitrogen isotopes(δ^(13)Candδ^(15)N))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 ofδ^(13)Candδ^(15)N)along soil profile,the mechanisms underlying their vertical distribution were mainly introduced here.There were three mechanisms driving theδ^(13)Cvertical distribution in soil profile:1)historical changes of vegetationδ^(13)Cvalue,2)changes of C3-C4 species dominance in plant communities,3)accumulation of^(13)C-enriched microbial-derived carbon during decomposition.The effects of^(13)C Suess effect on the vertical distribution of δ^(13)Cin soil profile were also discussed.There were four mechanisms underlying the vertical distribution ofδ^(15)N)in soil profile:1)^(15)N-depletion gas loss during denitrification,2)accumulation of^(15)N-enriched microbial-derived nitrogen during decomposition,3)accumulation of^(15)N-encriched mycorrhizal fungi residues in deep soil as a result of transferring^(15)N-depleted nitrogen compounds to plants by mycorrhizae,4)intera-ction 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.