Livestock cultivation is a significant source of greenhouse gas(GHG) emissions, accounting for 14.5% of the total anthropogenic emissions. China is responsible for a considerable share of the global livestock emission...Livestock cultivation is a significant source of greenhouse gas(GHG) emissions, accounting for 14.5% of the total anthropogenic emissions. China is responsible for a considerable share of the global livestock emissions, particularly caused by pork production. We used the Kaya identity and the logarithmic mean Divisia index(LMDI) to decompose the national annual GHG emissions from enteric fermentation and manure management in pig farming in China from 1976 to 2016. We decomposed the sources of the emissions into five driving factors:(1) technological progress(e.g., feed improvement);(2) structural adjustment in the livestock sector;(3) structural adjustment in agriculture;(4) affluence;and(5) population growth. The results showed that the net GHG emissions from the pig sector in China increased 16 million tons(Mt) of carbon dioxide equivalents(CO2 eq) during the study period. The decomposition analysis revealed that structural adjustment in agriculture, growing affluence, and population growth contributed to an increase of the GHG emissions of pork production by 23, 41, and 13 Mt CO2 eq, respectively. The technological progress and structural changes in animal husbandry mitigated emissions by –51 and –11 Mt CO2 eq, respectively. Further technological progress in pig production and optimizing the economic structures are critical for further reducing GHG emissions in China's pig industry. Our results highlight the dominant role of technological changes for emission reductions in the pig farming.展开更多
稻田固碳减排,是国家实现碳中和战略的重要举措。为推动长江中下游地区水稻绿色生产,本文在界定水稻生产碳源、碳汇功能的基础上,分析了长江中下游省(市)区域碳排放及碳中和现状,解析了不同稻作模式的碳排放特征,评估了不同农艺措施对...稻田固碳减排,是国家实现碳中和战略的重要举措。为推动长江中下游地区水稻绿色生产,本文在界定水稻生产碳源、碳汇功能的基础上,分析了长江中下游省(市)区域碳排放及碳中和现状,解析了不同稻作模式的碳排放特征,评估了不同农艺措施对稻田固碳减排的影响及潜力,提出并构建了“增汇、减排、降耗、循环”的低碳稻作体系。基于文献统计结果显示:长江中下游省(市)区域的碳中和水平为-1.52~1.75 Mt C-eq;区域内稻作模式的碳中和水平为-401~2673 kg C-eq/(hm^(2)·a);总体而言,免耕、秸秆还田、氮肥减施、间歇灌溉及稻田种养等农艺措施均可实现碳盈余,表明通过合理农艺措施、优化布局稻作模式,能够提高水稻生产碳中和水平。展开更多
基金financially supported by the National Social Science Fund of China (16CJL035)the China Scholarship Council Program for Visiting Scholars。
文摘Livestock cultivation is a significant source of greenhouse gas(GHG) emissions, accounting for 14.5% of the total anthropogenic emissions. China is responsible for a considerable share of the global livestock emissions, particularly caused by pork production. We used the Kaya identity and the logarithmic mean Divisia index(LMDI) to decompose the national annual GHG emissions from enteric fermentation and manure management in pig farming in China from 1976 to 2016. We decomposed the sources of the emissions into five driving factors:(1) technological progress(e.g., feed improvement);(2) structural adjustment in the livestock sector;(3) structural adjustment in agriculture;(4) affluence;and(5) population growth. The results showed that the net GHG emissions from the pig sector in China increased 16 million tons(Mt) of carbon dioxide equivalents(CO2 eq) during the study period. The decomposition analysis revealed that structural adjustment in agriculture, growing affluence, and population growth contributed to an increase of the GHG emissions of pork production by 23, 41, and 13 Mt CO2 eq, respectively. The technological progress and structural changes in animal husbandry mitigated emissions by –51 and –11 Mt CO2 eq, respectively. Further technological progress in pig production and optimizing the economic structures are critical for further reducing GHG emissions in China's pig industry. Our results highlight the dominant role of technological changes for emission reductions in the pig farming.
文摘稻田固碳减排,是国家实现碳中和战略的重要举措。为推动长江中下游地区水稻绿色生产,本文在界定水稻生产碳源、碳汇功能的基础上,分析了长江中下游省(市)区域碳排放及碳中和现状,解析了不同稻作模式的碳排放特征,评估了不同农艺措施对稻田固碳减排的影响及潜力,提出并构建了“增汇、减排、降耗、循环”的低碳稻作体系。基于文献统计结果显示:长江中下游省(市)区域的碳中和水平为-1.52~1.75 Mt C-eq;区域内稻作模式的碳中和水平为-401~2673 kg C-eq/(hm^(2)·a);总体而言,免耕、秸秆还田、氮肥减施、间歇灌溉及稻田种养等农艺措施均可实现碳盈余,表明通过合理农艺措施、优化布局稻作模式,能够提高水稻生产碳中和水平。
