Assessment of the impact of the integrated crop-livestock-bioenergy system on agricultural greenhouse gases in China
The utilization of surplus straw and manure derived from the crop and livestock production systems for bioenergy production presents a valuable approach to mitigate environmental pressures associated with the crop-livestock system,while concurrently addressing greenhouse gas emissions.This study establishes an integrated framework encompassing crops,livestock and bioenergy,and employs a life cycle assessment methodology to quantify the greenhouse gas emissions inventory across diverse processes within crop and livestock production systems at both national and provincial scales from 2010 to 2019.By comparing emissions and regional differentials between the integrated crop-livestock-bioenergy system and conventional system during distinct production phases.These findings shed light on the environmental impact of the integrated approach on agricultural emissions.The findings reveal that:(1)Notably,the baseline scenario identifies three key sources of agricultural greenhouse gas emissions:crop straw management,livestock enteric fermentation,and energy consumption in crop production,with notable regional variations.(2)Environmental impact intensity shows a fluctuating trend in most regions or provinces,with a pronounced decline(-0.73×10-2)observed in eastern China,while Xinjiang experiences the largest increase(0.63 × 10-2).(3)The abundant surplus straw and manure in these systems present a significant opportunity.The integrated system demonstrates a remarkable ability to mitigate agricultural greenhouse gas emissions,potentially cutting nationwide environmental impacts by up to 67％at its maximum.
万方数据
维普
