Effect Of Pig Manure On Distribution Of Nitrogen And Greenhouse Gases Emission

The effect of long-term fertilization of pig manure on distribution of N was studied injiaxing, Zhejiang province, China. and take moisture soil of YuHang as examples to discuss theeffect of greenhouse gases emission under animal faeces wastes amendment, provide scientificreferences for reclamation of wastes and soil quality improvement.Based on a10-year-long fertilization experiment in paddy field in JiaXing, we studied thedistribution of nitrogen in soil profile. The results showed that compared with chemical fertilizedsoil, there were significant increases capacities of soil total nitrogen, hydrolysis-N, Nitrate-N andammonia nitrogen by long-term poultry manure application．The level of nitrogen increased acrossthe soil profile from the surface soil downwards after long-term poultry manure injected into soiland mainly accumulated on the cultivate profile. Specific performance: fertilizing five years and10years （10⁵0） cm soil profile of total nitrogen in the enrichment levels were significantlyhigher than no fertilizing soil, and with the fertilizing years increasing, the total nitrogen of thesurface soil increases, the available nitrogen is mainly concentrated in the soil profile （0³5） cm,the fertilization of five years and10years of the available nitrogen is more than the0yearfertilization for30.3%and42.3%. NO-3-N and NH+4-N in the soil profile of the10-year residueis always higher than the0year and five years fertilization.Through the experiment of pig slurry amendment in aquic soil, it was observed aboutemission of green gases based on a closed-chamber and gas chromatography-based system in July2010（summer） and March2011（winter）. The main purpose of the study is in order to study thecharacteristics of N₂O emissions and relationship between gas emission fluxes and relatedenvironmental factors. The results showed that nitrogen application significantly affected the N₂Oemission from this aquic soil （P<0.001）, N₂O emissions ranged from11.25to68.47μg·m－2·h－1for no fertilization, from20.13to244.35μg·m－2·h－1for normal fertilization, from40.09to618.43μg·m－2·h－1for excessive fertilization, respectively. And nitrogen application affected the CO₂emission and CH₄emission from this aquic soil, CO₂emissions ranged from130.2to169.2μgN·m^-2·h^-1for no fertilization, from190.8to218.6μgN·m^-2·h^-1for normal fertilization, from178.3to297.0μgN·m^-2·h^-1for excessive fertilization, respectively, and CH₄emissions ranged from -0.01to0.01μgN·m^-2·h-1for no fertilization, from0.03to0.26μgN·m^-2·h-1for normal fertilization,from0.05to0.76μgN·m^-2·h-1for excessive fertilization, respectively. There was an exponentialrelationship between nitrogen application rates and N₂O emission. In addition, soil temperatureaffected the N₂O emission. But also with the improvement of temperature, the N₂O emissionincreased in this experimental time. There are significant exponential relationships（P<0.001）between N₂O emissions and the soil moisture, and there are significant exponentialrelationships（P<0.05） between N₂O emissions and mass fraction of soil nitrate. But there is nosignificant relationship between soil temperature and CO₂emission, as well as between soiltemperature and CH₄emission, but there is significant relationship between soil moisture and CH₄emission in this experiment. Besides application same amount of nitrogen, N₂O emissions fromslurry was much higher than nitrogen fertilizer such as urea or thiamine. So it is important toimpose pig slurry reasonably and pay attention to the combined factors such as soil moisture, soiltemperature and other factors for the controlling of soil green gases flux.