Land-use type affects N2O production pathways in subtropical acidic soils

A - Papers appearing in refereed journals

Zhang, Y., Ding, H., Zheng, X., Ren, X., Cardenas, L. M., Carswell, A. M. and Misselbrook, T. H. 2018. Land-use type affects N2O production pathways in subtropical acidic soils. Environmental Pollution. 237, pp. 237-243.

AuthorsZhang, Y., Ding, H., Zheng, X., Ren, X., Cardenas, L. M., Carswell, A. M. and Misselbrook, T. H.
Abstract

The change in land-use from woodland to crop production leads to increased nitrous oxide (N2O)emissions. An understanding of the main N2O sources in soils under a particular land can be a useful tool in developing mitigation strategies. To better understand the effect of land-use on N2O emissions, soils were collected from 5 different land-uses in southeast China: shrub land (SB), eucalyptus plantation (ET), sweet potato farmland (SP), citrus orchard (CO) and vegetable growing farmland (VE). A stable isotope experiment was conducted incubating soils from the different land use types at 60% water holding capacity (WHC), using 15NH4NO3 and NH4 15NO3 to determine the dominant N2O production pathway for the different land-uses. The average N2O emission rates for VE, CO and SP were 5.30, 4.23 and 3.36 mgN kg1 dry soil d1, greater than for SB and ET at 0.98 and 1.10 mgN kg1 dry soil d1, respectively. N2O production was dominated by heterotrophic nitrification for SB and ET, accounting for 51 and 50% of N2O emissions, respectively. However, heterotrophic nitrification was negligible (<8%) in SP, CO and VE,where autotrophic nitrification was a primary driver of N2O production, accounting for 44, 45 and 66%
for SP, CO and VE, respectively. Denitrification was also an important pathway of N2O production across
all land-uses, accounting for 35, 35, 49, 52 and 32% for SB, ET, SP, CO and VE respectively. Average N2O
emission rates via autotrophic nitrification, denitrification and heterotrophic nitrification increased significantly with gross nitrification rates, NO3 contents and C:N ratios respectively, indicating that these were important factors in the N2O production pathways for these soils. These results contribute to our understanding and ability to predict N2O emissions from different land-uses in subtropical acidic soils
and in developing potential mitigation strategies.

KeywordsNitrous oxide ; Heterotrophic nitrification ; Autotrophic nitrification ; Denitrification; 15N; Stable isotope
Year of Publication2018
JournalEnvironmental Pollution
Journal citation237, pp. 237-243
Digital Object Identifier (DOI)doi:10.1016/j.envpol.2018.02.045
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
Online24 Feb 2018
Publication process dates
Accepted15 Feb 2018
PublisherElsevier Sci Ltd
Copyright licenseCC BY
ISSN0269-7491

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