Abstract:

In the study, a field test method was conducted to measure and estimate the economic yield, economic coefficient, carbon emissions and carbon fixation of mountain bananas in the chemical fertilizer reduction model. There was no significant change in the economic yield of banana with 20% reduction of chemical fertilizer comparing with the conventional fertilization. Banana yield decreased by 24.1% when the reduction of chemical fertilizer reached 30%. When chemical fertilizer was reduced by 10%, 20%, 30% respectively, the carbon fixation of banana plants decreased by 2.15%, 3.51% and 11.33%, and the carbon emissions from chemical fertilizers decreased by 10.01%, 10% and 10% except the soil carbon emissions of the treatment of 10% chemical fertilizer reduced increased by 12.67%, that of the others decreased by 16.94% and 3.41%. Based on the plant carbon fixation and soil carbon emission, the estimation by net carbon emission of per banana plant, the net carbon emission of each banana plant of the treatment of the conventional fertilization, chemical fertilization reduced by 10%, 20%, 30% was 4731.29, 5529.03, 4418.47 and 4415.30 g/plant, respectively. To guarantee the production, chemical fertilization reduced by 20% had the greatest potential of carbon fixation and emission reduction. The study showed that reasonable reduction of chemical fertilizer could achieve a win-win situation of the economic and ecological benefits of banana planting in mountainous areas.

Key words: chemical fertilize reduction, carbon emission reduction, carbon fixation, banana planting in mountain areas