title: [Effects of plastic film mulching on soil CO2 efflux and CO2 concentration in an oasis cotton field].
abstract: A field study was conducted to compare soil CO2 efflux and CO2 concentration between mulched and non-mulched cotton fields by using closed chamber method and diffusion chamber technique. Soil CO2 efflux and CO2 concentration exhibited a similar seasonal pattern, decreasing from July to October. Mulched field had a lower soil CO2 efflux but a higher CO2 concentration, compared to those of non-mulched fields. Over the measurement period, cumulative CO2 efflux was 1871.95 kg C . hm-2 for mulched field and 2032.81 kg C . hm-2 for non-mulched field. Soil CO2 concentration was higher in mulched field (ranging from 5137 to 25945 µL . L-1) than in non- mulched field (ranging from 2165 to 23986 µL . L-1). The correlation coefficients between soil CO2 concentrations at different depths and soil CO2 effluxes were 0.60 to 0.73 and 0.57 to 0.75 for the mulched and non-mulched fields, indicating that soil CO2 concentration played a crucial role in soil CO2 emission. The Q10 values were 2.77 and 2.48 for the mulched and non-mulched fields, respectively, suggesting that CO2 efflux in mulched field was more sensitive to the temperature.
authors.forename: Yong-xiang
authors.initials: YX
authors.lastname: Yu
authors.forename: Cheng-yi
authors.initials: CY
authors.lastname: Zhao
authors.forename: Hong-tao
authors.initials: HT
authors.lastname: Jia
authors.forename: Bo
authors.initials: B
authors.lastname: Yu
authors.forename: Tian-he
authors.initials: TH
authors.lastname: Zhou
authors.forename: Yu-guang
authors.initials: YG
authors.lastname: Yang
authors.forename: Hua
authors.initials: H
authors.lastname: Zhao
mesh_terms: D000383:Agriculture / Q000379:methods*; D002245:Carbon Dioxide / Q000032:analysis*; D003368:Gossypium; D010969:Plastics; D012987:Soil / Q000737:chemistry*; D013696:Temperature
chemical_list: D010969:Plastics; D012987:Soil; D002245:Carbon Dioxide