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 language | English |
|---|---|
| Pages (from-to) | 1-8 |
| Journal | Soil Biology and Biochemistry |
| Volume | 106 |
| DOIs | |
| Publication status | Published - 2017 |
Fingerprint
Keywords
- Denitrification
- Dissolved organic carbon
- NO/(NO+N) ratio
- Nitrate leaching
- Nitrous oxide
Cite this
}
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 journal › Article › Academic › peer-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 -