The Effect Of Exotic Matters Amendments On Greenhouse Gases Emission In Fuzhou Paddy Fields

Global climate change is a hot issue in today’s study, and the increasing greenhouse gases emission is considered to be the main cause of this change. Paddy fields are considered an important source of greenhouse gases emissions, thereby, it is very important to adopt effective methods to reduce greenhouse gases emissions for mitigating global climate warming. In this study, Wufeng Experimental Station of Fujian Rice Institute was chosen as the study site, and the effects of exotic matter amendment on the greenhouse gases emissions in early paddy field were measured by the static chamber-gas chromatography method. Six treatments were included:applying steel slag, biochar, sea shells, gypsum slag, and steel slag calcium silicon fertilizer at an addition rate of 8 Mg hm-2, respectively and the control. Furthermore, the effects of exotic matter amendment on the nutrient characteristics of soil and irrigation water, and rice yield were also discussed. The aim of this study was to provide an appropriate reference for the friendly management method of paddy field in Fuzhou plain. The main results are showed as follows:(1) The averaged CO2 emissions were 1067.43,852.29,848.11,887.24,830.41, 838.54 mg m-2 h-1 in the control plot and steel slag, biochar, sea shells, gypsum slag and steel slag calcium silicon fertilizer treatments plots, respectively. Compared with the control plot, CO2 emissions were reduced by 20.15%,20.55%,16.88%,22.21% and 21.44% in the steel slag, biochar, sea shells, gypsum slag and steel slag calcium silicon fertilizer treatments plots, respectively.(2) The averaged CH4 emissions were 7.17,3.32,2.39,2.67,1.33,3.93 mg m-2 h-1 in the control plot and steel slag, biochar, sea shells, gypsum slag and steel slag calcium silicon fertilizer treatments plots, respectively. Compared with the control plot, CH4 emissions were reduced by 53.76%,66.69%,62.74%,81.53% and 64.28% in the steel slag, biochar, sea shells, gypsum slag and steel slag calcium silicon fertilizer treatments plots, respectively.(3) The averaged N2O emissions were 25.02,10.90,-13.23,-1.71,-24.65,-16.57 μg m-2 h-1 in the control plot and steel slag, biochar, sea shells, gypsum slag and steel slag calcium silicon fertilizer treatments plots, respectively. Compared with the control plot, N2O emissions were reduced by 56.45%,152.89%,106.82%,198.51% and 166.24% in the steel slag, biochar, sea shells, gypsum slag and steel slag calcium silicon fertilizer treatments plots, respectively.(4) The integrated greenhouse gases effects were 29118.77,21380.62,20433.23, 21585.79,19168.06,21357.51 kg CO2-eq hm-2 in the control plot and steel slag, biochar, sea shells, gypsum slag and steel slag calcium silicon fertilizer treatments plots, respectively. Compared with the control plot, the integrated greenhouse gases effects were reduced by 26.57%,29.83%,25.87%,34.17% and 26.65% in the steel slag, biochar, sea shells, gypsum slag and steel slag calcium silicon fertilizer treatments plots, respectively.(5) Soil nutrient was increased to some degree in the steel slag, biochar, sea shells, and steel slag calcium silicon fertilizer treatments plots, thereby increasing rice yield. Compared with the control plot, the rice yields were increased by 7.07%,15.56%, 6.41%,3.23% and 26.65% in the steel slag, biochar, sea shells, and steel slag calcium silicon fertilizer treatments plots, respectively.(6) Seen from the perspective of integrated greenhouse gases effects and rice yield, the exotic matters except gypsum slag can be used as the effective amendments for the paddy field management of Fuzhou plain.