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Energy use efficiency, GHG emissions, and carbon efficiency of paddy rice production in Iran

机译：伊朗水稻生产的能源利用效率，温室气体排放和碳效率

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摘要

The energy efficiency, greenhouse gas (GHG) emissions, and carbon efficiency of paddy rice production were analysed in Sari in the Mazandaran province of Iran during 2011–2012. Data was collected through questionnaires and interviews with paddy producers. The results showed that the net energy gain was 27,932 MJ ha-1 and energy efficiency was 1.83 during production. The results of the Cobb-Douglas (CD) model showed that the energy inputs of machinery, diesel fuel, chemical fertilizers, and biocides had positive impacts on yield, while the impacts of seed and human labour were negative. For every 1 MJ increase in energy input, the inputs of seed, labour, machinery, diesel fuel, chemical fertilizers and biocides, changed the yield as -0.058, -0.992, 0.078, 0.004, 0.027, and 0.089 kg, respectively. The energy input of machinery with a high beta coefficient (0.64) had the most impact on crop yield (p≤0.01). The total GHG emission for paddy production was determined to be 1,936 kgCO2eq ha-1, with diesel fuel and machinery having the greatest contributions.Carbon efficiency was estimated to be 4.01.
机译：在2011年至2012年期间，对伊朗Mazandaran省Sari的水稻生产的能源效率，温室气体（GHG）排放和碳效率进行了分析。通过问卷调查和与稻谷生产者的访谈收集了数据。结果表明，生产期间的净能量增益为27,932 MJ ha-1，能量效率为1.83。 Cobb-Douglas（CD）模型的结果表明，机械，柴油燃料，化肥和杀生物剂的能量输入对产量产生积极影响，而种子和人工劳动则产生负面影响。能源输入每增加1 MJ，种子，人工，机械，柴油，化肥和杀生物剂的输入就将产量分别更改为-0.058，-0.992、0.078、0.004、0.027和0.089 kg。 β系数高（0.64）的机械的能量输入对农作物产量的影响最大（p≤0.01）。稻谷生产的总温室气体排放量确定为1,936 kgCO2eq ha-1，其中柴油和机械的贡献最大，碳效率估计为4.01。

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