Is partial substitution of animal manure for synthetic fertilizer a viable N2O mitigation option? An integrative global meta-analysis

IF 5.6 1区 农林科学 Q1 AGRONOMY
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Abstract

Context or problem

Partially substituting synthetic fertilizer by animal manure has been proposed as a sustainable agricultural practice, from the perspectives of improving soil quality and mitigating climate warming.

Objective or research question

Previous studies showed that manure application combined with synthetic fertilizer (MACSF) also altered soil nitrous oxide (N2O) emissions, while the magnitude varied substantially among experiments. We hypothesized that the difference in local conditions may be responsible for the contrasting impact of MACSF on N2O emissions, while their significance and relative importance have not been explicitly assessed.

Methods

In order to quantify the response of N2O emissions to MACSF and its geographic variability, we conducted a meta-analysis by combining 291 observations from 103 sites across the globe. Also, we evaluated the impact of local conditions on N2O emissions and compared their relative importance using the gradient boosting decision tree (GBDT) algorithm.

Results

Overall, MACSF did not have significant effect on soil N2O emissions, with a global average effect size (ES) of 1.07 ± 0.10 (95 % confidence interval, CI) relative to the same amount of synthetic nitrogen fertilizer. The corresponding N2O emission factor (EF) was estimated as 0.93 ± 0.13 % (95 % CI). However, both ES and EF varied substantially with local conditions, of which the substitution ratio (SR) and soil pH were identified as the most important factors. The ES increased significantly (p < 0.01) with the increasing SR. Critical SR was approx. 50 %, above which MACSF may exacerbate N2O emissions. Moreover, both response indices increased significantly with the decreasing soil pH. MACSF in acidic soils (pH < 6.5) tended to increase N2O emissions, with ES significantly (p < 0.05) higher than 1.0.

Conclusion

The contribution of MACSF to N2O mitigation varies subustantially with local conditions, of which SR and soil pH are the most important two. MACSF reduces N2O emissions only in the cases with low SR and neutral to alkaline soils.

Implications or significance

This study offers an integrative global synthesis of the impact of MACSF on N2O emissions. By identifying the key controlling factors, the findings serve to guide the development of region-specific tailored substitution strategies, considering its contribution to N2O emission mitigation.

部分用动物粪便替代合成肥料是可行的一氧化二氮减缓方案吗?全球综合荟萃分析
背景或问题从改善土壤质量和减缓气候变暖的角度来看,用动物粪便部分替代合成肥料被认为是一种可持续的农业实践。目标或研究问题以往的研究表明,施用粪便与合成肥料相结合(MACSF)也会改变土壤一氧化二氮(N2O)的排放,但不同实验的影响程度有很大差异。我们假设,当地条件的差异可能是 MACSF 对 N2O 排放产生不同影响的原因,但其意义和相对重要性尚未得到明确评估。方法为了量化 N2O 排放对 MACSF 的响应及其地理变异性,我们综合了全球 103 个地点的 291 项观测数据,进行了一项荟萃分析。此外,我们还评估了当地条件对 N2O 排放的影响,并使用梯度提升决策树(GBDT)算法比较了它们的相对重要性。结果总体而言,相对于相同数量的合成氮肥,MACSF 对土壤 N2O 排放没有显著影响,全球平均影响大小(ES)为 1.07 ± 0.10(95 % 置信区间,CI)。相应的一氧化二氮排放系数(EF)估计为 0.93 ± 0.13 %(95 % 置信区间)。然而,ES 和 EF 因当地条件而有很大差异,其中替代率 (SR) 和土壤 pH 值被认为是最重要的因素。随着 SR 的增加,ES 明显增加(p < 0.01)。临界 SR 约为 50%,超过这一临界值,MACSF 可能会加剧 N2O 的排放。此外,随着土壤 pH 值的降低,两个响应指数都明显增加。酸性土壤(pH 值为 6.5)中的 MACSF 有增加 N2O 排放的趋势,ES 显著(p 为 0.05)高于 1.0。只有在低 SR 和中性至碱性土壤的情况下,MACSF 才能减少 N2O 排放。通过确定关键控制因素,考虑到其对 N2O 排放减缓的贡献,研究结果有助于指导制定针对具体地区的定制替代战略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Field Crops Research
Field Crops Research 农林科学-农艺学
CiteScore
9.60
自引率
12.10%
发文量
307
审稿时长
46 days
期刊介绍: Field Crops Research is an international journal publishing scientific articles on: √ experimental and modelling research at field, farm and landscape levels on temperate and tropical crops and cropping systems, with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.
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