| 【Objective】Based on the study on carbon footprints of different cropping patterns in double cropping rice area of southern China, this paper compared and analysed the cropping patterns in combination with economic benefits, aiming to provide a reference for making agricultural production policies and a new way for carbon sequestration and emission reduction in agriculture.【Method】The output values and production cost inputs of rice, oil crops and vegetable crops were used to calculate the carbon footprints of indirect carbon emissions（chemical fertilizer, pesticide, agricultural film and agricultural machinery）of different planting patterns, and the economic benefits of various patterns were analysed.【Result】Semilate rice had the highest carbon footprint〔947.8 kg/hm2（CO2-eq）〕, and early rice had the lowest carbon footprint〔927.4 kg/hm2（CO2-eq）〕. Semilate rice of Zhejiang Province had the highest carbon footprint〔1 057.3 kg/hm2（CO2-eq）〕, and that of Hainan Province had the lowest carbon footprint〔747.8 kg/hm2（CO2-eq）〕. The average carbon footprints of single, double and triple cropping patterns were 939.0, 2 910.0 and 3 961.8 kg/hm2（CO2-eq）, respectively. Among the agricultural inputs, carbon footprint of fertilizer accounted for the largest proportion, with an average of 60.2%. Among different cropping patterns, the output value of triple cropping pattern was the highest, with an average value of nearly 130 000 yuan/hm2, and the costprofit ratio of early rice was the lowest, which was -11.2%. The carbon footprints and production cost compositions of various cropping patterns were similar, but the proportion of each factor varied greatly, and there was the greatest difference in fertilizer and labour.【Conclusion】The output value of the triple cropping pattern is the highest, which plays a good role in guaranteeing China's food security and improving farmers' income, while its carbon footprint is also higher than that of the single and double cropping patterns. There is a significant positive correlation between carbon footprint and output value. The carbon footprint of average net profit per unit of the triple cropping pattern is the lowest. Reducing fertilizer consumption is the key way to reduce carbon footprint, and reducing labour cost is the main way to reduce production cost and increase farmers' income. |
