| The increased concentration of greenhouse gases in the atmosphere mainly caused global wanning, greenhouse gas emissions caused by agricultural activity got increasingly concerned, fertilization impacted greenhouse gas emissions in the farmland, which is an important factor. For high intensity of production, high degree of intensive and large amount of waste generated of livestock and poultry in Chengdu Plain, planting and breeding industry has been separated for a long time, which caused accumulation of feces and direct emissions, triggering a series of regional environmental hazards. Therefore, in Chengdu plain rice-wheat rotation mode, through the field in situ monitoring respectively this study arranged control, conventional chemical fertilizer, pig manure and chemical fertilizer application, single application of pig manure and other seven pig manure with different proportion of alternative nitrogen fertilizer treatment, discussing the characteristics of greenhouse gas emission?CO2? CH4, N2O? applied pig manure on farmland, influence factors and Global Warming Potential, for the scientific evaluation of waste of livestock on farmlands, providing a theoretical basis.searching for good economic and environmental benefits. These results suggested that:?1? Each processing of greenhouse gases?CO2.CH4,N2O?emissions consistent varied same in rice-wheat rotation system, the emissions characteristics were quite different in the two seasons. CH4 emissions were mainly concentrated in the rice growing season that had applied fertilization, fewer in wheat season, basically in the negative, CO2 emission were mainly concentrated in the early stage of two season that Jointing stage and filling stage; N2O emission mainly concentrated in the earlier stage after one month applied fertilization in wheat season, fewer in rice season. In the whole growing period of rice-wheat rotation system,CH4 and CO2 total cumulative emissions compared with single chemical fertilizer were increased by 2.41?4.81 times and 18.62%?58.15%; Total cumulative emissions of N2O applied organic pig manure and chemical fertilizer compared the single fertilizer decreased 21.61%?28.78%,which could reduce greenhouse effect. ?2? Correlation analysis related to daily average temperature, temperature in gas chamber.5cm soil temperature and soil moisture showed that:soil moisture is the main factor affecting CH4 emissions in the rice season, the CH4 emission flux and soil moisture content showed a significant positive correlation; There were many factors of CO2 emission in rice season, which were significantly positively correlated with the daily average temperature, gas temperature,5 cm soil temperature.while was significantly negatively correlated with soil water content; 5 cm soil temperature and soil water content are the main factors affecting N2O emission flux in wheat season. From the total cumulative emissions of greenhouse gases, NH4+-N and SOC in soil are significantly positively correlated with the accumulation of CH4. CO2 and N2O emission flux in rice-wheat season; Greenhouse gas cumulative emissions were positively correlated with NO3--N, being unrelated with wheat season. ?3? Global Warming Potential?GWP? applied organic pig manure increased in the rice season. taking the dominant position by CH4, the contribution of each treatment with CH4 in GWP accounted for 85%-97%. reducing CH4 emissions were the key in the rice season:The GWP applied pig manure decreased in the wheat season, the contribution of N2O emission in GWP were more than 94%. reducing N2O emission were the key in the wheat season; Integrated the total GWP in rice-wheat rotation. CH4 is still dominated in the total GWP, the contribution of CH4 in GWP accounted for 85%?97% and 72%?92% of GWP, so reducing CH4 emissions were the key in rice-wheat rotation system.?4? The Green House Emission Intensity suggested:yield of rice that applied the appropriate amount of organic manure increased significantly in the rice season while improving GHGI in the rice season; yield of wheat that applied the appropriate amount of organic manure increased significantly in the wheat season,while also reduced the GHGl in wheat season, effectively reducing greenhouse gas emissions in the unit of output. From the total GHG1 in whole rice-wheat rotation system, Under the same nitrogen level, GHG1 applied pig manure on farmland increased, but it were not significant.In the rice-wheat rotation system, an appropriate amount of organic pig manure and chemical fertilizer combined application could balance between yield and its environmental effects.?5? The appropriate amount of organic fertilizer application increased the grain yield in rice-wheat rotation system, compared with chemical fertilizer, organic fertilizer and manure fertilizer increased 2.92%-3.44%in yield.Organic fertilizer application of pig manure also reduced the cost of fertilizer in rice wheat rotation system, increasing the income of farmers.Taking all considerations, manure fertilizer +50%?T3?treatment of organic fertilizerinput best, Rice-wheat rotation systemconsumpted pig 26529 kg·hm-2, pigs carrying got 40.36·hm-2, which could effectively achieve manure resource utilization, achieving higher economic efficiency, taking into account the environmental effects. |
PDF Full Text Request