Author(s): Qlan Cui; Chang Chun Song; Xian Wei Wang
Linked Author(s):
Keywords: Warming; N O flux; Peatlands; Soil temperature; Active layer depth
Abstract: Climate warming is expected to increasingly influence boreal peatlands and alter their greenhouse gases emissions. However, the effects of warming on N O fluxes and the N O budgets were ignored in boreal peatlands. Therefore, in a boreal peatland of permafrost zone in Northeast China, a simulated warming experiment was conducted in 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 2013to 2015. Results showed that warming treatment increased air temperature at 1.5 m aboveground and soil temperature at 5cm depth by 0.6°C and 2°C, respectively. The average seasonal N O fluxes ranged from 6.62 to9.34μg m h in the warming plot and ranged from 0.41 to 4.55μg m h in the control plots. Warming treatment increased N O fluxes by 147% and transformed the boreal peatlands from a N O sink to a source. The primary driving factors for N O fluxes were soil temperature and active layer depth, whereas soil moisture showed a weak correlation with N O fluxes. The results indicated that warming promoted N O fluxes by increasing soil temperature and active layer depth in a boreal peatland of permafrost zone in Northeast China. Moreover, elevated N O fluxes persisted in this region will potentially drive a noncarbon feedback to ongoing climate change.
Year: 2018