期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 82, 期 -, 页码 44-51出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2014.12.013
关键词
Nitrous oxide; Fire effects; Mediterranean Macchia; N cycling; Nitrification; Denitrification
类别
资金
- NitroEurope IP [017841]
- Short Term Scientific Mission (STSM) travel grant [COST-STSM-ES0804]
- Academy of Finland [267183]
- Ramon y Cajal fellowship [RYC-2012-10970]
- Academy of Finland (AKA) [267183, 267183] Funding Source: Academy of Finland (AKA)
Intensification of droughts under climate change is projected to increase fire frequency in the Mediterranean region. Fires cause direct emission of greenhouse gases (GHG) such as carbon dioxide (CO2) and nitrous oxide (N2O), due to the combustion of organic matter, creating a positive feedback on climate change. However, the potential importance of indirect GHG emissions due to changes in soil biological and chemical properties after fire is less well known. Increased soil mineral nitrogen (N) concentrations after fire pose a risk for increased emissions of gaseous N, but studies on the post-fire N2O production and soil N turnover rates (mineralization, nitrification, microbial immobilization, denitrification) are still rare. We determined N2O production, rates of N turnover and pathways for N2O production from the soil of burned and unburned plots of a Macchia shrubland in central Spain using a N-15 labelling approach. Measurements were initiated before the controlled burning and continued for up to half a year after fire. Fire markedly increased the risk of N2O emissions from soil through denitrification (N2O production rate was 3 to approximate to 30 times higher in burned soils compared to control, with N2O being produced solely from soil nitrate). In contrast, soil gross N cycling rates were not accelerated after fire. Thus, the increased N2O production was not closely linked with N mineralization, but may be explained by increased mineral N availability from ash, increased pH in burned plots, and less competition for available N and C sources due to absence of plants. (c) 2014 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据