应用生态学报2017，Vol.28Issue(10)：3119-3126,8.DOI:10.13287/j.1001-9332.201710.026
增温和隔离降雨对亚热带森林土壤N2O通量的影响
Effects of warming and precipitation exclusion on soil N2O fluxes in subtropical forests
摘要
Abstract
In order to explore how soil warming and precipitation exclusion influence soil N2O fluxes,we used related functional genes as markers,and four treatments were set up,i.e.,control (CT),soil warming (W,5 ℃ above the ambient temperature of the control),50％ precipitation reduction (P),soil warming plus 50％ precipitation reduction (WP).The results showed that precipitation exclusion reduced soil ammonium nitrogen concentration significantly.Soil warming decreased soil N2O flux and soil denitrification potential significantly.Soil microbial biomass nitrogen (MBN) in warming treatment (W) and precipitation exclusion treatment (P) was significantly lower than that in the control.The amoA gene abundance of AOA was negatively correlated with MBN and ammonium nitrogen contents,but neither soil nitrification potential nor soil N2O flux was correlated with the amoA gene abundance of AOA.Path analysis showed that the denitrification potential affected soil N2O flux directly,while microbial biomass phosphorus (MBP) and warming affected soil N2O flux indirectly through their direct effects on denitrification potential.Temperature might be the main driver of N2O flux in subtropical forest soils.Global warming would reduce N2O emissions from subtropical forest soils.关键词
增温/隔离降雨/亚热带/N2O通量/反硝化势Key words
warming/precipitation exclusion/subtropics/N2O flux/denitrification potential引用本文复制引用
唐偲頔,张政,蔡小真,郭剑芬,杨玉盛..增温和隔离降雨对亚热带森林土壤N2O通量的影响[J].应用生态学报,2017,28(10):3119-3126,8.基金项目
本文由国家重大科学研究计划项目(2014CB954003)资助 This work was supported by the National Major Scientific Research Program of China (2014CB954003). （2014CB954003）
