Impact of 13-years of nitrogen addition on nitrous oxide and methane fluxes and ecosystem respiration in a temperate grassland

A - Papers appearing in refereed journals

Chen, S., Hao, T., Goulding, K. W. T., Misselbrook, T. H. and Liu, X. 2019. Impact of 13-years of nitrogen addition on nitrous oxide and methane fluxes and ecosystem respiration in a temperate grassland. Environmental Pollution. 252, pp. 675-681.

AuthorsChen, S., Hao, T., Goulding, K. W. T., Misselbrook, T. H. and Liu, X.
Abstract

Nitrogen (N) fertilizer application and atmospheric N deposition will profoundly affect greenhouse gas (GHGs) emissions, especially nitrous oxide (N2O) and methane (CH4) fluxes and ecosystem respiration (Re, i.e. CO2 emissions). However, the impacts of long-term N inputs and the often associated N-induced soil acidification on GHG fluxes in arid and semi-arid ecosystems, especially temperate grasslands, are still uncertain. An in situ experiment was conducted to investigate the effect of long-term (13-years) N addition on N2O and CH4 fluxes and Re from a temperate grassland in Inner Mongolia, northeast China, from April 2017 to October 2018. Soil pH values in the 0e5 cm layer receiving 120 (N120) and 240 (N240)kg N ha1 decreased from 7.12 to 4.37 and 4.18, respectively, after 13 years of N inputs. Soil CH4 uptake was significantly reduced, but N2O emission was enhanced significantly by N addition. However, N addition had no impact on Re. Structural Equation Modeling indicated that soil NH4 þ-N content was the dominant control of N2O emissions, but with less effect of the decreasing pH. In contrast, CH4 uptake was generally controlled by soil pH and NO3-N content, and Re by forb biomass. The measured changes in N2O and CH4 fluxes and Re from temperate grassland will have a profoundly impact on climate change.

KeywordsGrassland ecosystem; Long-term N addition; Soil acidification; Greenhouse gas emissions; Influencing factors
Year of Publication2019
JournalEnvironmental Pollution
Journal citation252, pp. 675-681
Digital Object Identifier (DOI)doi:10.1016/j.envpol.2019.03.069
Web address (URL)https://doi.org/10.1016/j.envpol.2019.03.069
Open accessPublished as non-open access
FunderBBSRC Newton funding
Funder project or codeUK - China Virtual Joint Centre for Improved Nitrogen Agronomy (CINAG)
Output statusPublished
Publication dates
Online08 May 2019
Publication process dates
Accepted17 Mar 2019
Copyright licensePublisher copyright
PublisherElsevier Sci Ltd
ISSN0269-7491

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