Impact of elevated tropospheric ozone on soil C, N and microbial dynamics of winter wheat
Hu, E; Yuan, Z; Zhang, H; Zhang, W; Wang, X; Jones, SB; Wang, N
HERO ID
4250148
Reference Type
Journal Article
Year
2018
Language
English
| HERO ID | 4250148 |
|---|---|
| In Press | No |
| Year | 2018 |
| Title | Impact of elevated tropospheric ozone on soil C, N and microbial dynamics of winter wheat |
| Authors | Hu, E; Yuan, Z; Zhang, H; Zhang, W; Wang, X; Jones, SB; Wang, N |
| Journal | Agriculture, Ecosystems & Environment |
| Volume | 253 |
| Page Numbers | 166-176 |
| Abstract | Tropospheric O-3 can impact soil systems mediated by changing root biomass and exudates. This study investigated how elevated O-3 alters soil CO2 and N2O emissions from a winter wheat field. Winter wheat (Triticwn aestivum L.) were fumigated using elevated O-3 concentration (EO3) and using ambient air within open-top chambers during 2015 and 2016. Soil CO2 and N2O emissions were measured using a static closed-chamber technique. Rhizosphere soils were collected to determine dissolved organic carbon (DOC) content, ammonium nitrogen (NH4+-N) and nitrate-nitrogen (NO3--N) concentrations, microbial biomass carbon (MBC) and nitrogen (MBN), and activities of nitrate reductase (NR), nitrite reductase (NiR) and hydroxylamine reductase (HR). Moreover, volumetric soil water content (theta(v)) was monitored and plant dry biomass was quantified. The EO3 treatment exhibited decreased CO2 and increased N2O emissions from winter wheat soil. Soil NH4+-N, NO3--N, NR and NiR increased under EO3, whereas DOC, MBC, MBN and HR decreased. Soil 61, was higher under EO3 before irrigation, due to reduced transpiration. Elevated O-3 decreased soil CO2 flux potentially due to reduced root biomass and associated carbon input. It increased N2O fluxes apparently through enhanced de nitrification due to greater substrate availability and soil theta(v), despite the inhibition of nitrification-related routes. |
| Doi | 10.1016/j.agee.2017.11.010 |
| Wosid | WOS:000418312100017 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Keyword | Elevated ozone; Carbon dioxide; Nitrous oxide; Denitrifying enzymes; Soil water content |