Research On The Emission Characteristics Of Greenhouse Gas （N₂O,CH₄） And NH₃Through The Whole Processes Of Pig Manure Compost And Its Vegetable Land Use

Greenhouse gas (GHG) emission from vegetable land is of great concern recently because agriculture land is one of major sources contributing to global GHG emission. In this study an experiment of Lactuca saliva L. land applied with different animal manure composts was carried out in a greenhouse vegetable land located in the surburb of Beijing to in-situ monitor emission of GHG and ammonia, as well as analyzing factors of affecting GHG and ammonia emission. Results showed that emission factors (EFs) of CH4from Treatment NRM. RM and CF were0.20%,0.03%and0.04%, respectively, and EFs of N2O from these three treatments were0.18%.0.63%and0.74%, respectively, and EFs of ammonia were2.00%.3.98%.2.53%. respectively. CH4emission flux was significantly affected with soil temperature and humidity. N2O emission flux was related to soil temperature, surface temperature and humidity. The emission fluxes of CH4, N2O and NH3were significantly affected by soil moisture, but there was little relation of emissions of CH4. N2O and NH3and ambient temperature in the greenhouse.A representative open-air windrow pig manure compost factory was Selected and studied. Exploring the affect of additives modified red mud on greenhouse gas emissions and nitrogen fixxing phosphorus reserving. The results show that stack adding modified red mud do not make the greenhouse gas emissions decrease but Increase. NH3mainly product in the composting of high temperature period of Composting and N2O has a larger emission inlater maturity period. Methane emission concentration on the week before high temperature period and the two weeks after the later maturity period. Greenhouse gas and ammonia emission of the Shaded is generally higher than the Sunny side in the same stack. Turning the stack will obviously influence the CH4. N2O emissions. The temperature of middle level is above upper strata and lower stratum of the stack. Phosphate and ammonia slowly decreased with the composting process while nitrate nitrogen and nitrite nitrogen increased sharply in the end of composting.