Reducing livestock quantities to avoid manure nitrogen surplus: would meat self-sufficiency be met in eastern regions of China?

IF 12.4 Q1 ENVIRONMENTAL SCIENCES Resources Environment and Sustainability Pub Date : 2024-04-16 DOI:10.1016/j.resenv.2024.100156
Yang Li , Zhigang Sun , Xiangzheng Deng , Francesco Accatino
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Abstract

In building a sustainable food system, the management of livestock production should avoid nitrogen (N) surplus and ensure animal-sourced food self-sufficiency. Reducing livestock quantities in regions producing excess of animal-sourced food and livestock manure is an effective approach for mitigating manure N surplus. In this study, we considered the eastern regions of China as a case study to quantitatively analyze whether meat self-sufficiency could be met when reducing the livestock quantity to avoid manure N surplus. In addition to considering the baseline scenario, considering the current livestock quantity (scenario C), we defined three strategies corresponding to livestock reduction scenarios: taking meat self-sufficiency as a priority regardless of the manure balance (scenario TB); taking manure N surplus avoidance as a priority regardless of the meat balance (scenario MNB); and considering the most limiting conditions between satisfying meat self-sufficiency and avoiding manure N surplus (scenario LF). A balance index was used to describe the excess (i.e., positive value) or deficiency (i.e., negative value) of meat and manure N. Concerning the whole of eastern China, in scenario LF, the meat balance index (TBI) and manure N balance index (MNBI) were 0.25 and −0.39, respectively, which could satisfy meat demand while avoid manure N surplus (for scenarios C, TB, and MNB, the TBIs were 1.95, 0, and 1.09, and the MNBIs were 0.56, −0.48, and 0, respectively). At the regional level, the regions with meat self-sufficiency accounted for more than 70% in the LF scenario, and manure N surplus could be avoided in all regions. However, southwestern China should adopt further measures, such as trading among adjacent regions and increasing manure fertilizer application, to satisfy the meat demand while avoiding surplus manure N.

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减少牲畜数量以避免粪肥氮过剩:中国东部地区能否实现肉类自给自足?
在建设可持续粮食系统的过程中,畜牧业生产管理应避免氮(N)过剩,确保动物源食品自给自足。在动物源性食物和牲畜粪便过剩的地区减少牲畜数量是缓解粪便氮过剩的有效方法。在本研究中,我们以中国东部地区为例,定量分析了在减少牲畜数量以避免粪肥氮过剩的情况下,能否实现肉类自给自足。除了考虑基线情景,即考虑当前牲畜数量(情景 C)外,我们还定义了与牲畜减少情景相对应的三种策略:不考虑粪肥平衡,优先考虑肉类自给自足(情景 TB);不考虑肉类平衡,优先考虑避免粪肥氮过剩(情景 MNB);考虑满足肉类自给自足和避免粪肥氮过剩之间的最大限制条件(情景 LF)。采用平衡指数来描述肉类和粪肥的过剩(即正值)或不足(即负值)、就整个华东地区而言,在 LF 情景下,肉类平衡指数(TBI)和粪肥氮平衡指数(MNBI)分别为 0.25 和 -0.39,可以在满足肉类需求的同时避免粪肥氮过剩(在 C、TB 和 MNB 情景下,TBI 分别为 1.95、0 和 1.09,MNBI 分别为 0.56、-0.48 和 0)。从区域层面来看,在 LF 情景下,肉类自给率超过 70%,所有地区均可避免粪肥氮过剩。但是,西南地区应进一步采取相邻地区间交易、增加粪肥施用量等措施,在满足肉类需求的同时避免粪肥氮过剩。
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来源期刊
Resources Environment and Sustainability
Resources Environment and Sustainability Environmental Science-Environmental Science (miscellaneous)
CiteScore
15.10
自引率
0.00%
发文量
41
审稿时长
33 days
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