论文题目:

Effects of warming on N2O fluxes in a boreal peatland of Permafrost region, Northeast China

英文论文题目:

Effects of warming on N2O fluxes in a boreal peatland of Permafrost region, Northeast China

第一作者:

崔倩

英文第一作者:

Cui, Q.

联系作者:

宋长春

英文联系作者:

Song, C. C.

发表年度:

2018

卷:

616

页码:

427-434

摘要:

Climate warming is expected to increasingly influence boreal peatlands and alter their greenhouse gases emissions. However, the effects of warming on N2O fluxes and the N2O budgets were ignored in boreal peatlands. Therefore, in a boreal peatland of permafrost zone in Northeast China, a simulated warming experiment was conducted to investigate the effects of warming on N2O fluxes in Betula. Fruticosa community (B. Fruticosa) and Ledum. palustre community (L. palustre) during the growing seasons from 2013 to 2015. Results showed that warming treatment increased air temperature at 1.5 m aboveground and soil temperature at 5 cm depth by 0.6 degrees C and 2 degrees C, respectively. The average seasonal N2O fluxes ranged from 6.62 to 9.34 mu g m(-2) h(-1) in the warming plot and ranged from 0.41 to 4.55 mu g m(-2) h(-1) in the control plots. Warming treatment increased N2O fluxes by 147% and transformed the boreal peatlands from a N2O sink to a source. The primary driving factors for N2O fluxes were soil temperature and active layer depth, whereas soil moisture showed a weak correlation with N2O fluxes. The results indicated that warming promoted N2O fluxes by increasing soil temperature and active layer depth in a boreal peatland of permafrost zone in Northeast China. Moreover, elevated N2O fluxes persisted in this region will potentially drive a noncarbon feedback to ongoing climate change. (c) 2017 Elsevier B.V. All rights reserved.

英文摘要:

Climate warming is expected to increasingly influence boreal peatlands and alter their greenhouse gases emissions. However, the effects of warming on N2O fluxes and the N2O budgets were ignored in boreal peatlands. Therefore, in a boreal peatland of permafrost zone in Northeast China, a simulated warming experiment was conducted to investigate the effects of warming on N2O fluxes in Betula. Fruticosa community (B. Fruticosa) and Ledum. palustre community (L. palustre) during the growing seasons from 2013 to 2015. Results showed that warming treatment increased air temperature at 1.5 m aboveground and soil temperature at 5 cm depth by 0.6 degrees C and 2 degrees C, respectively. The average seasonal N2O fluxes ranged from 6.62 to 9.34 mu g m(-2) h(-1) in the warming plot and ranged from 0.41 to 4.55 mu g m(-2) h(-1) in the control plots. Warming treatment increased N2O fluxes by 147% and transformed the boreal peatlands from a N2O sink to a source. The primary driving factors for N2O fluxes were soil temperature and active layer depth, whereas soil moisture showed a weak correlation with N2O fluxes. The results indicated that warming promoted N2O fluxes by increasing soil temperature and active layer depth in a boreal peatland of permafrost zone in Northeast China. Moreover, elevated N2O fluxes persisted in this region will potentially drive a noncarbon feedback to ongoing climate change. (c) 2017 Elsevier B.V. All rights reserved.

刊物名称:

Science of the Total Environment

英文刊物名称:

Science of the Total Environment