The Key Process Analysis Of Iron Slag To Control Methane Emission From Rice Paddy

This article choose Fujian Academy of Agricultural Sciences WuFeng experimental base four of the rice fields, a piece of as control group, three other pieces were to add2,4,8Mg-hm"2iron slag, using in situ static boxes-gas chromatography, from early rice transplanting to mature stage began to produce methane, oxidation, transmission and emission flux for seasonal and diurnal variations, discussed the add iron slag on rice paddy soil after the main environmental factor influence as well as the iron slag add on rice paddy produced methane, oxidation, transmission and emission flux influence.(1) Iron slag added to produce methane is apparent inhibition, both a significant negative correlation (P<0.05). This is mainly because iron slag increased soil trivalent iron content and improved the soil salinity is the result of.(2) Iron slag added can effectively improve rice paddies methane oxidation rate, but the biggest methane oxidation rate happen4Mg·hm-2iron slag added in the sample. This is mainly due to the slag granular structure and slag containing nutrients promote the growth of rice root biomass.(3) A corresponding reduction in the amount of methane plant transfer with the increase in the amount of iron slag add, both showed a significant negative correlation (P <0.05). Methane bubbles in the iron blast furnace slag added traffic is significantly reduced. This is mainly the inhibition of iron slag to add methane production while increasing the free oxygen of the oxide layer in the soil nearby, promoting methane oxidation due. The spread of the emissions of methane transmission itself is very small; the spread of methane throughput does not change significantly when different iron slag added. In addition, the addition of iron slag has also changed the ratio of the three transmission channels, the plant transfer ratio was increased decline in the proportion of bubbles and diffusion transfer, but did not change significantly.(4) Iron slag add significantly reduced methane emission flux paddy fields, the biggest of the methane emissions reductions in emissions of methane happened peak, iron slag quantity and methane emission flux add a significant negative correlation (P<0.05). This is mainly composed of iron slag discharge of methane caused by the inhibitory effect.(5) After the addition of iron slag, the diurnal variation of methane emission reduction effect significant emission peak of the most significant (P<0.05), which,8Mg·hm-2iron slag to add emission reduction the most significant effect.