title: [Short-term response of soil CH4 flux to simulated precipitation in a winter wheat field on the Loess Plateau, Northwest China].
abstract: To understand the short-term response of soil CH4 flux to different precipitation events in a winter wheat field on the Loess Plateau, we conducted precipitation simulation experiments during winter wheat jointing stage and summer fallow period to measure the soil CH4 flux in 0 to 72 h after precipitation simulation of 1 to 32 mm. Results showed that CH4 flux during 0 to 72 h fluctuated at 1 to 8 mm of precipitation application and peaked at 16 and 32 mm. Cumulative CH4 flux after 72 h of precipitation (CH4-C) increased linearly with the precipitation amount (P) (wheat jointing stage: CH-C=2.45P-6.09, R2=0.92, P<0.01; summer fallow: CH-C=2.43P-4.73, R2 = 0.91, P<0.01). Statistical analysis showed that CH4 flux was also correlated with soil water content and microbial biomass carbon but not with soil temperature. In the long run, small precipitation events (1-8 mm) could enhance the intensity of soil CH4 sink and such promoting effect would be weakened with further increase in precipitation amount. However, large precipitation events (≥16 mm) could change the soil function from CH4 sink to source by stimulating the activity of soil methanogens during short-term periods.
authors.forename: Quan-quan
authors.initials: QQ
authors.lastname: Liu
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Rong-rong
authors.initials: RR
authors.lastname: Chen
authors.forename: Wen-zhao
authors.initials: WZ
authors.lastname: Liu
authors.forename: Upendra M
authors.initials: UM
authors.lastname: Sainju
mesh_terms: D018533:Biomass; D002681:China; D008697:Methane / Q000737:chemistry*; D011891:Rain; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D013696:Temperature; D014908:Triticum; D014867:Water
chemical_list: D012987:Soil; D014867:Water; D008697:Methane