Seasonal variations in N2 and N2O emissions from a wheat–maize cropping system

Tuo Chen, Oene Oenema, Jiazhen Li, Tom Misselbrook, Wenxu Dong, Shuping Qin, Haijing Yuan, Xiaoxin Li, Chunsheng Hu*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

The N losses via denitrification and the N2/N2O emission ratio are highly uncertain, mainly due to methodological difficulties concerning measurement of N2 emissions. Here, we report on seasonal measurements of N2O and N2 emissions from the top soil of a winter wheat–summer maize double-cropping system in the North China Plain. A novel double cylinder soil core method was used to measure N2O and N2 fluxes in situ from a 20-year field experiment with four N fertilizer treatments (0, 200, 400, and 600 kg N ha−1 year−1) and 16 sampling occasions over a 1-year period. The N2-free helium-oxygen atmosphere in the inter-layer between the two cylinders acted as a buffer against N2 diffusion from the atmosphere into the soil core. Total N2O emissions were 0.44, 1.31, 2.19, and 2.23 kg N ha−1 year−1, and total N2 emissions were 8.3, 20.0, 22.5, and 24.7 kg N ha−1 year−1 from the N0, N200, N400, and N600 treatments, respectively. The N2/N2O emission ratio ranged from 2 to 136, indicating that N2 was the dominant gas. The N2/N2O ratio was much higher in summer than in winter, and was inversely related to fertilizer N application. Fluxes of N2 were statistically related to soil temperature and concentrations of NO3-N and DOC in soil extracts, while N2O fluxes were related to soil water content and concentrations of NO3-N and exchangeable NH4+ in soil extracts. The N2/N2O ratio was related to soil temperature and exchangeable NH4+ and NO3-N concentrations. Our study provides new insights on variations of the N2/N2O emission ratio in agroecosystems, and shows the importance of seasonal measurements.

Original languageEnglish
Pages (from-to)539-551
JournalBiology and Fertility of Soils
Volume55
Issue number6
Early online date15 Jun 2019
DOIs
Publication statusPublished - Aug 2019

Fingerprint

cropping systems
cropping practice
Soil
seasonal variation
Fertilizers
soil temperature
Atmosphere
nitrogen fertilizers
soil
fertilizer
double cropping
helium
winter
atmosphere
soil air
Denitrification
extracts
Helium
Temperature
agricultural ecosystem

Keywords

  • Denitrification
  • Missing nitrogen
  • N flux
  • N/NO ratio
  • Nitrogen balance

Cite this

Chen, Tuo ; Oenema, Oene ; Li, Jiazhen ; Misselbrook, Tom ; Dong, Wenxu ; Qin, Shuping ; Yuan, Haijing ; Li, Xiaoxin ; Hu, Chunsheng. / Seasonal variations in N2 and N2O emissions from a wheat–maize cropping system. In: Biology and Fertility of Soils. 2019 ; Vol. 55, No. 6. pp. 539-551.
@article{493913f9a63346b0928c86fd1a675ad7,
title = "Seasonal variations in N2 and N2O emissions from a wheat–maize cropping system",
abstract = "The N losses via denitrification and the N2/N2O emission ratio are highly uncertain, mainly due to methodological difficulties concerning measurement of N2 emissions. Here, we report on seasonal measurements of N2O and N2 emissions from the top soil of a winter wheat–summer maize double-cropping system in the North China Plain. A novel double cylinder soil core method was used to measure N2O and N2 fluxes in situ from a 20-year field experiment with four N fertilizer treatments (0, 200, 400, and 600 kg N ha−1 year−1) and 16 sampling occasions over a 1-year period. The N2-free helium-oxygen atmosphere in the inter-layer between the two cylinders acted as a buffer against N2 diffusion from the atmosphere into the soil core. Total N2O emissions were 0.44, 1.31, 2.19, and 2.23 kg N ha−1 year−1, and total N2 emissions were 8.3, 20.0, 22.5, and 24.7 kg N ha−1 year−1 from the N0, N200, N400, and N600 treatments, respectively. The N2/N2O emission ratio ranged from 2 to 136, indicating that N2 was the dominant gas. The N2/N2O ratio was much higher in summer than in winter, and was inversely related to fertilizer N application. Fluxes of N2 were statistically related to soil temperature and concentrations of NO3−-N and DOC in soil extracts, while N2O fluxes were related to soil water content and concentrations of NO3−-N and exchangeable NH4+ in soil extracts. The N2/N2O ratio was related to soil temperature and exchangeable NH4+ and NO3−-N concentrations. Our study provides new insights on variations of the N2/N2O emission ratio in agroecosystems, and shows the importance of seasonal measurements.",
keywords = "Denitrification, Missing nitrogen, N flux, N/NO ratio, Nitrogen balance",
author = "Tuo Chen and Oene Oenema and Jiazhen Li and Tom Misselbrook and Wenxu Dong and Shuping Qin and Haijing Yuan and Xiaoxin Li and Chunsheng Hu",
year = "2019",
month = "8",
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Chen, T, Oenema, O, Li, J, Misselbrook, T, Dong, W, Qin, S, Yuan, H, Li, X & Hu, C 2019, 'Seasonal variations in N2 and N2O emissions from a wheat–maize cropping system', Biology and Fertility of Soils, vol. 55, no. 6, pp. 539-551. https://doi.org/10.1007/s00374-019-01373-8

Seasonal variations in N2 and N2O emissions from a wheat–maize cropping system. / Chen, Tuo; Oenema, Oene; Li, Jiazhen; Misselbrook, Tom; Dong, Wenxu; Qin, Shuping; Yuan, Haijing; Li, Xiaoxin; Hu, Chunsheng.

In: Biology and Fertility of Soils, Vol. 55, No. 6, 08.2019, p. 539-551.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Seasonal variations in N2 and N2O emissions from a wheat–maize cropping system

AU - Chen, Tuo

AU - Oenema, Oene

AU - Li, Jiazhen

AU - Misselbrook, Tom

AU - Dong, Wenxu

AU - Qin, Shuping

AU - Yuan, Haijing

AU - Li, Xiaoxin

AU - Hu, Chunsheng

PY - 2019/8

Y1 - 2019/8

N2 - The N losses via denitrification and the N2/N2O emission ratio are highly uncertain, mainly due to methodological difficulties concerning measurement of N2 emissions. Here, we report on seasonal measurements of N2O and N2 emissions from the top soil of a winter wheat–summer maize double-cropping system in the North China Plain. A novel double cylinder soil core method was used to measure N2O and N2 fluxes in situ from a 20-year field experiment with four N fertilizer treatments (0, 200, 400, and 600 kg N ha−1 year−1) and 16 sampling occasions over a 1-year period. The N2-free helium-oxygen atmosphere in the inter-layer between the two cylinders acted as a buffer against N2 diffusion from the atmosphere into the soil core. Total N2O emissions were 0.44, 1.31, 2.19, and 2.23 kg N ha−1 year−1, and total N2 emissions were 8.3, 20.0, 22.5, and 24.7 kg N ha−1 year−1 from the N0, N200, N400, and N600 treatments, respectively. The N2/N2O emission ratio ranged from 2 to 136, indicating that N2 was the dominant gas. The N2/N2O ratio was much higher in summer than in winter, and was inversely related to fertilizer N application. Fluxes of N2 were statistically related to soil temperature and concentrations of NO3−-N and DOC in soil extracts, while N2O fluxes were related to soil water content and concentrations of NO3−-N and exchangeable NH4+ in soil extracts. The N2/N2O ratio was related to soil temperature and exchangeable NH4+ and NO3−-N concentrations. Our study provides new insights on variations of the N2/N2O emission ratio in agroecosystems, and shows the importance of seasonal measurements.

AB - The N losses via denitrification and the N2/N2O emission ratio are highly uncertain, mainly due to methodological difficulties concerning measurement of N2 emissions. Here, we report on seasonal measurements of N2O and N2 emissions from the top soil of a winter wheat–summer maize double-cropping system in the North China Plain. A novel double cylinder soil core method was used to measure N2O and N2 fluxes in situ from a 20-year field experiment with four N fertilizer treatments (0, 200, 400, and 600 kg N ha−1 year−1) and 16 sampling occasions over a 1-year period. The N2-free helium-oxygen atmosphere in the inter-layer between the two cylinders acted as a buffer against N2 diffusion from the atmosphere into the soil core. Total N2O emissions were 0.44, 1.31, 2.19, and 2.23 kg N ha−1 year−1, and total N2 emissions were 8.3, 20.0, 22.5, and 24.7 kg N ha−1 year−1 from the N0, N200, N400, and N600 treatments, respectively. The N2/N2O emission ratio ranged from 2 to 136, indicating that N2 was the dominant gas. The N2/N2O ratio was much higher in summer than in winter, and was inversely related to fertilizer N application. Fluxes of N2 were statistically related to soil temperature and concentrations of NO3−-N and DOC in soil extracts, while N2O fluxes were related to soil water content and concentrations of NO3−-N and exchangeable NH4+ in soil extracts. The N2/N2O ratio was related to soil temperature and exchangeable NH4+ and NO3−-N concentrations. Our study provides new insights on variations of the N2/N2O emission ratio in agroecosystems, and shows the importance of seasonal measurements.

KW - Denitrification

KW - Missing nitrogen

KW - N flux

KW - N/NO ratio

KW - Nitrogen balance

U2 - 10.1007/s00374-019-01373-8

DO - 10.1007/s00374-019-01373-8

M3 - Article

VL - 55

SP - 539

EP - 551

JO - Biology and Fertility of Soils

JF - Biology and Fertility of Soils

SN - 0178-2762

IS - 6

ER -