论文部分内容阅读
通过田间试验研究了不同缓/控释尿素对水稻产量和稻田周年温室气体排放的影响,评估生产单位质量水稻的温室气体排放量.结果表明:优化施肥(OPT)处理在减氮(N)21.4%条件下产量与习惯施肥(FFP)处理持平,同时减少了稻田周年CH_4和N_2O的排放,其中水稻季CH_4和N_2O分别减排12.6%和12.5%,休闲季N_2O减排33.3%.与OPT处理相比,控释尿素(CRU)处理在水稻季CH_4减排28.9%,休闲季CH_4零排放;硝化抑制剂(DMPP)处理在水稻季CH_4和N_2O分别减排41.6%和85.7%,休闲季CH_4和N_2O分别减排76.9%和6.5%.休闲季节N_2O排放占周年N_2O排放的76.8%~94.9%,是评价整个稻田温室气体排放不容忽视的因素.OPT、CRU和DMPP处理生产1.0 kg稻谷的温室气体排放强度分别为0.50、0.41和0.33kg·kg~(-1),综合考虑周年的温室气体排放总量和产量,尿素和硝化抑制剂配合施用可以在保证水稻产量的情况下,减少温室气体的排放.
The effects of different slow / controlled release urea on rice yield and annual greenhouse gas emissions were evaluated through field experiments to evaluate the greenhouse gas emissions per unit of production of rice.The results showed that OPT treatment could reduce nitrogen (N) 21.4 %, FFP treatment reduced the annual CH_4 and N_2O emissions of paddy fields, including 12.6% and 12.5% reduction of CH_4 and N_2O in rice season and 33.3% reduction of N_2O in leisure season, respectively. Compared with OPT treatment Controlled release urea (CRU) treatment reduced CH_4 emissions by 28.9% during the rice season and zero CH_4 emissions during the leisure season. Nitrification inhibitor (DMPP) reduced CH_4 and N_2O emissions by 41.6% and 85.7% And N2O, respectively, and 76.9% and 6.5% respectively in the leisure season, and 76.8% ~ 94.9% of the annual N2O emission during the leisure season, which is a factor that can not be ignored in estimating greenhouse gas emissions in the whole paddy field. The emission intensity of gas is 0.50, 0.41 and 0.33 kg · kg -1, respectively. Considering the annual total amount of greenhouse gas emission and output, the combined application of urea and nitrification inhibitor can reduce the greenhouse gas emission Emissions.