doi:

DOI: 10.3724/SP.J.1011.2012.00330

Chinese Journal of Eco-Agriculture (中国生态农业学报) 2012/20:3 PP.330-336

Influence of drip irrigation under plastic film mulching on concentrations of CO2 and CH4 in soil


Abstract:

A pot experiment was conducted in a greenhouse to compare the influences of flood (F) and drip (D) irrigations on soil concentrations of CO2 and CH4 during potato cropping season using the static opaque chamber and gas chromatography technique. Two agronomic measures were evaluated for each irrigation regime under mulched (M) and non-mulched conditions. Three more treatments were set under mulched drip irrigation (MD) based on different wet ratio (P) — P1 (P=25%), P2 (P=33%) and P3 (P=50%). There were six treatments altogether, denoted as DP1, MDP1, MDP2, MDP3, FC and MF. Bare soils with (MBS) and without (BS) plastic film mulching were set as control treatments. Results suggested that mulching treatments increased soil CO2 concentration by 10.4%~94.5% due to plastic film mulching increasing effect on temperature and moisture, and barrier effects on natural air transmission of the soil-atmosphere system. Mulching treatments decreased soil CH4 concentration by 5.1%~47.4%. Because of dry-wet alternation under drip-irrigation and decreased soil aeration under flood irrigation, CO2 concentration was 7.4%~49.7% higher under flood irrigation and CH4 concentration 6.6%~68.2% lower under drip irrigation. Soil moisture influenced greenhouse gas emission by altering soil aeration and soil dissolved organic matter. The higher the wet ratio under MD, the lower was CO2 concentration. However, the effect of wet ratio on CH4 concentration was not clear. Soil temperature was the main driving factor of soil respiration, which also regulated CH4 oxidation processes. The greenhouse gas concentration in soils after DP1 irrigation showed a significant positive correlation between soil temperature and soil CO2 concentra-tion. Also after DP1 irrigation, a significant negative correlation existed between soil temperature and soil CH4 con-centration while a significant negative correlation was noted between soil CO2 and CH4 concentrations.

Key words:Drip irrigation with plastic film mulching, Flood irrigation, CO2 and CH4 concentration, Wet ratio, Temperature and humidity of soil

ReleaseDate:2014-06-18 16:05:14

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