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- Title
Short-term response of soil CH<sub>4</sub> flux to simulated precipitation in a winter wheat field on the Loess Plateau, Northwest China.
- Authors
LIU Quan-quan; WANG Jun; CHEN Rong-rong; LIU Wen-zhao; Sainju, Upendra M.
- 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: CH4-C=2.45P-6.09, R2=0.92, P<0.01; summer fallow: CH4-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.
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2015, Vol 26, Issue 1, p140
- ISSN
1001-9332
- Publication type
Article