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
Funder project or codeUK - China Virtual Joint Centre for Improved Nitrogen Agronomy (CINAG)
FunderBBSRC Newton funding
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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