Irrigation of DOC-rich liquid promotes potential denitrification rate and decreases N2O/(N2O+N2) product ratio in a 0–2 m soil profile

Shuping Qin, Chunsheng Hu*, Tim J. Clough, Jiafa Luo, Oene Oenema, Shungui Zhou

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

16 Citations (Scopus)

Abstract

Lack of dissolved organic carbon (DOC) is generally one of the key factors limiting denitrification in subsoil beneath the root zone. Despite a number of laboratory DOC amendment studies, the effects of in situ DOC infiltration on subsoil denitrification, and on subsequent end product composition, are less understood. Here, we report on the effects of in situ infiltration of a DOC-rich liquid, derived from decomposing straw, on potential denitrification rate (PDR), N2O/(N2O + N2) product ratio, and nitrate stock in a 0–2 m soil profile. The results showed that in situ infiltration with a DOC-rich liquid (100 mm, 2 ton DOC ha−1) significantly increased the DOC concentration and PDR, and significantly decreased the N2O/(N2O + N2) product ratio in the soil profile. Up to 70% of the nitrate accumulated in the 0–2 m soil profile disappeared within three weeks following the infiltration of the DOC-rich liquid. The majority of the nitrate removed could be accounted for by denitrification. The predominant end product of denitrification was N2. The mass ratio between the consumed DOC and nitrate-N was about 5. Our results demonstrate the significant potential for removing subsoil nitrate by in situ introduction of DOC generated from the above-ground crop biomass.

Original languageEnglish
Pages (from-to)1-8
JournalSoil Biology and Biochemistry
Volume106
DOIs
Publication statusPublished - 2017

Fingerprint

Denitrification
dissolved organic carbon
denitrification
soil profiles
soil profile
Soil
Carbon
irrigation
liquid
liquids
Nitrates
nitrates
infiltration (hydrology)
nitrate
infiltration
subsoil
rate
product
Biomass
limiting factor

Keywords

  • Denitrification
  • Dissolved organic carbon
  • NO/(NO+N) ratio
  • Nitrate leaching
  • Nitrous oxide

Cite this

@article{5a25ad86d65542978077a4bb0737c6cf,
title = "Irrigation of DOC-rich liquid promotes potential denitrification rate and decreases N2O/(N2O+N2) product ratio in a 0–2 m soil profile",
abstract = "Lack of dissolved organic carbon (DOC) is generally one of the key factors limiting denitrification in subsoil beneath the root zone. Despite a number of laboratory DOC amendment studies, the effects of in situ DOC infiltration on subsoil denitrification, and on subsequent end product composition, are less understood. Here, we report on the effects of in situ infiltration of a DOC-rich liquid, derived from decomposing straw, on potential denitrification rate (PDR), N2O/(N2O + N2) product ratio, and nitrate stock in a 0–2 m soil profile. The results showed that in situ infiltration with a DOC-rich liquid (100 mm, 2 ton DOC ha−1) significantly increased the DOC concentration and PDR, and significantly decreased the N2O/(N2O + N2) product ratio in the soil profile. Up to 70{\%} of the nitrate accumulated in the 0–2 m soil profile disappeared within three weeks following the infiltration of the DOC-rich liquid. The majority of the nitrate removed could be accounted for by denitrification. The predominant end product of denitrification was N2. The mass ratio between the consumed DOC and nitrate-N was about 5. Our results demonstrate the significant potential for removing subsoil nitrate by in situ introduction of DOC generated from the above-ground crop biomass.",
keywords = "Denitrification, Dissolved organic carbon, NO/(NO+N) ratio, Nitrate leaching, Nitrous oxide",
author = "Shuping Qin and Chunsheng Hu and Clough, {Tim J.} and Jiafa Luo and Oene Oenema and Shungui Zhou",
year = "2017",
doi = "10.1016/j.soilbio.2016.12.001",
language = "English",
volume = "106",
pages = "1--8",
journal = "Soil Biology and Biochemistry",
issn = "0038-0717",
publisher = "Elsevier",

}

Irrigation of DOC-rich liquid promotes potential denitrification rate and decreases N2O/(N2O+N2) product ratio in a 0–2 m soil profile. / Qin, Shuping; Hu, Chunsheng; Clough, Tim J.; Luo, Jiafa; Oenema, Oene; Zhou, Shungui.

In: Soil Biology and Biochemistry, Vol. 106, 2017, p. 1-8.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Irrigation of DOC-rich liquid promotes potential denitrification rate and decreases N2O/(N2O+N2) product ratio in a 0–2 m soil profile

AU - Qin, Shuping

AU - Hu, Chunsheng

AU - Clough, Tim J.

AU - Luo, Jiafa

AU - Oenema, Oene

AU - Zhou, Shungui

PY - 2017

Y1 - 2017

N2 - Lack of dissolved organic carbon (DOC) is generally one of the key factors limiting denitrification in subsoil beneath the root zone. Despite a number of laboratory DOC amendment studies, the effects of in situ DOC infiltration on subsoil denitrification, and on subsequent end product composition, are less understood. Here, we report on the effects of in situ infiltration of a DOC-rich liquid, derived from decomposing straw, on potential denitrification rate (PDR), N2O/(N2O + N2) product ratio, and nitrate stock in a 0–2 m soil profile. The results showed that in situ infiltration with a DOC-rich liquid (100 mm, 2 ton DOC ha−1) significantly increased the DOC concentration and PDR, and significantly decreased the N2O/(N2O + N2) product ratio in the soil profile. Up to 70% of the nitrate accumulated in the 0–2 m soil profile disappeared within three weeks following the infiltration of the DOC-rich liquid. The majority of the nitrate removed could be accounted for by denitrification. The predominant end product of denitrification was N2. The mass ratio between the consumed DOC and nitrate-N was about 5. Our results demonstrate the significant potential for removing subsoil nitrate by in situ introduction of DOC generated from the above-ground crop biomass.

AB - Lack of dissolved organic carbon (DOC) is generally one of the key factors limiting denitrification in subsoil beneath the root zone. Despite a number of laboratory DOC amendment studies, the effects of in situ DOC infiltration on subsoil denitrification, and on subsequent end product composition, are less understood. Here, we report on the effects of in situ infiltration of a DOC-rich liquid, derived from decomposing straw, on potential denitrification rate (PDR), N2O/(N2O + N2) product ratio, and nitrate stock in a 0–2 m soil profile. The results showed that in situ infiltration with a DOC-rich liquid (100 mm, 2 ton DOC ha−1) significantly increased the DOC concentration and PDR, and significantly decreased the N2O/(N2O + N2) product ratio in the soil profile. Up to 70% of the nitrate accumulated in the 0–2 m soil profile disappeared within three weeks following the infiltration of the DOC-rich liquid. The majority of the nitrate removed could be accounted for by denitrification. The predominant end product of denitrification was N2. The mass ratio between the consumed DOC and nitrate-N was about 5. Our results demonstrate the significant potential for removing subsoil nitrate by in situ introduction of DOC generated from the above-ground crop biomass.

KW - Denitrification

KW - Dissolved organic carbon

KW - NO/(NO+N) ratio

KW - Nitrate leaching

KW - Nitrous oxide

U2 - 10.1016/j.soilbio.2016.12.001

DO - 10.1016/j.soilbio.2016.12.001

M3 - Article

VL - 106

SP - 1

EP - 8

JO - Soil Biology and Biochemistry

JF - Soil Biology and Biochemistry

SN - 0038-0717

ER -