应用生态学报2017，Vol.28Issue(7)：2179-2185,7.DOI:10.13287/j.1001-9332.201707.039
蒙古栎叶片及其土壤碳、氮同位素自然丰度对大气CO2浓度升高的响应
Responses of the natural abundance of carbon and nitrogen isotopes of Quercus mongolica leaf and soil to elevated CO2
摘要
Abstract
The rising atmospheric CO2 concentration significantly changed soil nitrogen (N) cycling which is important for us to predict the carbon (C) sequestration potential of terrestrial ecosystems.The natural abundance of N isotope as an integrative indicator of ecosystem N cycling processes can effectively indicate the effect of elevated CO2 on soil N cycling processes.Here,we used an open top chamber experiment to examine the effects of elevated CO2 for ten years on the natural abundance of Quercus mongolica,soil and microbial biomass C and N isotopes in northeastern China.Our results showed that elevated CO2 significantly changed soil N cycling processes,resulting in the increase of microbial and leaf δ15N;stimulated the decomposition of 13C-enriched soil organic C,and offset the effect of more 13C-depleted plant photosynthetic C inputs,resulting in unchanged δ13C of soil dissolved organic C and microbes under elevated CO2.These results indicated that elevated CO2 likely increased the mineralization of soil organic matter,and the system is getting more N-limited.关键词
CO2浓度升高/15N/13C/氮素矿化/有机质分解/蒙古栎Key words
elevated CO2/15N/13C/nitrogen mineralization/organic matter decomposition/oak引用本文复制引用
孙建飞,戴崴巍,贺同鑫,彭勃,姜萍,韩士杰,白娥..蒙古栎叶片及其土壤碳、氮同位素自然丰度对大气CO2浓度升高的响应[J].应用生态学报,2017,28(7):2179-2185,7.基金项目
本文由国家重点基础研究发展计划项目(2014CB954400)、国家自然科学基金项目(31522010)和中国科学院先导研究项目(QYZDB-SSW-DQC006)资助 This work was supported by the Major State Basic Research Development Program of China (2014CB954400),National Natural Science Foundation of China (31522010) and Key Research Program of Frontier Sciences,Chinese Academy of Sciences (QYZDB-SSW-DQC006). （2014CB954400）
