Ecosystem stability assessment of the life cycle of rapeseed biodiesel.

The full life cycle of rapeseed biodiesel was taken as an example to establish the evaluation model of ecosystem stability for the content of WD,LD,NuD and BD.The results showed that the WD value for the full life cycle of rapeseed biodiesel was 0.75,water consumption was 3.75 times of the GDP water consumption every 10 000 yuan;LD value was 0.69,land occupation was 3.45 times of the GDP land use every 10 000 yuan;NuD value was 1.39,nutrient salt emissions was 13.9 times of the national average nutrient salt emissions every 10 000 yuan;BD value was 1.00,breaking the original plant diversity.During the rapeseed cultivation process,water consumption,land use,nitrogen emissions and phosphorus emissions respectively accounts for 99.97%,100%,98.31% and 100% in the full life cycle.Developing plants which was high-yield,drought-tolerant,high oil content and require low soil fertility was an effective measures to raise ecosystem stability of the biodiesel full life cycle.