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Chinese Agricultural Science Bulletin ›› 2013, Vol. 29 ›› Issue (3): 17-23.doi: 10.11924/j.issn.1000-6850.2012-0296

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Advance in Studies on Effect of Mulched Drip Irrigation on Production and Emission of Greenhouse Gas

  

  • Received:2012-02-06 Revised:2012-02-21 Online:2013-01-25 Published:2013-01-25

Abstract: CO2, CH4 and N2O have attracted increasing attention as great contributors to global warming. Mulched drip irrigation is also receiving wide interests as a water-saving agricultural technology. Research on the influence of soil temperature and moisture on production and emission of greenhouse gases (GHG), changes of soil temperature and moisture caused by mulched drip irrigation and their effects on emission of GHG were summarized in this paper. Research results demonstrated that: (1) soil temperature and moisture had an influence on production and emission of GHG by affecting soil microbial activity, soil aeration and gas transmission rate; (2) Emission rate of soil CO2 was positively related to topsoil temperature of superficial layer, the production of both CH4 and N2O had a certain optimum temperature, and the relation between the oxidation of CH4 and temperature was various; (3) Soil moisture’s effect on production and oxidation of CH4 and the production of N2O was greater than soil temperature, rate of methane oxidation was negatively related to soil moisture, while the emission of CO2 and N2O had an optimum moisture range; (4) The temperature-increasing and humidity-preserving effect, the barrier effect of gaseous transmission caused by mulch and the partially soil wetting pattern under drip irrigation would have an influence on the production and emission of GHG. In the end, several relevant research aspects left to be developed and perfected were summarized and presented: how to reduce GHG emission by confirming and controlling the wetting percentage of soil; how to quantify the combined effect of mulch and drip irrigation; how to regulate and control crops’process of growth through regulating soil CO2 emission.