| Global warming has become an indisputable fact,N2O has the warmingpotential of larger, absorbing long-wave radiation in the atmosphere destroying theozone layer, and persistent in the atmosphere moderate characteristics, growingconcern over N2O concentration effects on global warming and ozone layer.Estimated90%of N2O in the atmosphere comes from surface bio-sources. Soils inparticular soil, is the world’s most important source of N2O emissions. Warmingreaction in both N2O concentration changes in this study to be representative of soilN2O emissions from agricultural soils of China’s food industry bases in North Chinaplain for the study,in the wild field under natural conditions, soil warming and no-tillecosystem simulation experiments. In conditions of simulated global warming, studythe increase of temperature and the effects of no-tillage on soil in North China. Thestudy results showed that:(1)The simulated warming during the experimental plots of5cm soil layercompared to the average soil temperature and ambient temperature on still,respectively, an increase of1.91℃,1.5℃degrees centigrade, turning arable land and5cm soil in the surface layer of arable land with an average temperature increase of0.88c,0.47c. Analysis of variance: warming treatment vs control5cm soiltemperature difference (p<0.05) warming tillage and no-tillage, cold temperaturetillage and no-till room temperature under normal temperature differences are notsignificant.(2)Experiment during simulation warming sample to of5cm soil of WFPS andat room temperature on still to compared to, simulation warming processingrespectively than controlled processing soil moisture increased-8.18%, and-6.35%,doubled arable land and from arable land surface5cmWFPS increased has-6.65%,and-5.23%, by variance analysis: warming processing and controlled district5cmWFPS differences significantly (p<0.05), and warming plowing and warmingfrom tilling5cmWFPS differences significantly (p<0.05), and Tillage and no-tillageWFPS difference between ambient temperature at room temperature (p<0.05).(3)Processed agricultural soils of the four consecutive three months noticeconsistent with the observed diurnal variation of the diurnal variation of fourdifferent treatment trends vary from three days emissions are warming trend strengthplowing>temperature tillage>warming tillage>tillage room temperature, and showedlow daytime high night unanimously average daily temperature trends, there is nosignificant difference between the different months, but the attendant temperatures,four, five, total emissions have shown a downward trend in June, and the differencebetween the different treatment decreases.(4)In the crop growing season, warming plowing, tilling room temperature,warming tillage,no-till four different soil N2O temperature treatment, the averageemission flux is:49.61,28.70,29.04,31.05(μg.m-2.h-1) from the emissions intensitypoint of view, warming tillage>temperature tillage>warming tillage>temperatureplowed farmland soils are four treatments of N20emission sources.(5)Warming plowing, tilling room temperature, warming tillage, no-till soil N2O flux farmland temperature treatment are presented in four distinct seasons,mainly as low winter temperatures lower average flux higher average summertemperature is higher fluxes, simulated warming have a greater impact on soil N2Oemission flux, soil moisture at higher temperatures appear suitable flux emissionpeak season. |
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