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通过田间原位试验,研究长江中下游地区不同避涝作物种植模式对农田温室气体排放的影响,为该地区低碳作物种植模式的选择提供依据。利用静态箱法研究水稻-小麦(WRR)、黄心乌-茭白(WZR)、黄心乌-毛豆-荸荠(WECR)、水芹-芹芽-水稻(CCRR)和莲藕(LR)种植模式下农田的N_2O、CO_2和CH_4等温室气体的排放规律。结果表明:N_2O、CO_2和CH_4的排放具有明显的季节性,CO_2排放呈现夏季>秋季>春季>冬季,CH_4和N_2O排放呈现夏季>秋季;WECR、WRR和CCRR种植模式土壤CO_2排放量差异不显著,但都显著高于WZR,LR模式;WRR、CCRR和LR种植模式土壤N_2O排放量极显著高于WZR和WECR模式;LR极显著高于CCRR种植模式土壤CH_4排放量,而WZR、WECR和WRR极显著低于LR和CCRR。不同种植模式综合温室效应大小WRR>CCRR>WECR>LR>WZR,可见黄心乌-茭白模式综合温室效应最低,是长江中下游易涝区域低碳农业的较佳生产模式。
Field experiments were conducted to study the effects of different models of rain-sheltered crops on the greenhouse gas emissions in the middle and lower reaches of the Yangtze River so as to provide basis for the selection of low-carbon crop planting patterns in the region. The static box method was used to study the effects of WRR, WZR, WECR, CCRR and LR on the growth of rice. Farmland N2O, CO2 and CH4 and other greenhouse gas emissions. The results showed that the emission of N 2 O, CO 2 and CH 4 were obviously seasonal. The emission of CO 2 showed summer> autumn> spring> winter, while CH 4 and N 2 O emissions showed summer> autumn. The CO 2 emission of soil in WECR, WRR and CCRR was not significantly different , But both of them were significantly higher than WZR and LR models. The soil N 2 O emission of WRR, CCRR and LR models was significantly higher than that of WZR and WECR models, and LR was significantly higher than that of CCRR. WZR, WECR and WRR Very significantly lower than LR and CCRR. The integrated greenhouse effect WRR> CCRR> WECR> LR> WZR of different cropping patterns shows that the integrated greenhouse effect is the lowest in Huangxinwu-Baizhen mode, which is the preferred mode of low-carbon agriculture in the flood prone area in the middle and lower reaches of the Yangtze River.