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Potential of no-till agriculture as a nature-based solution for climate-change mitigation in Brazil
Soil and Tillage Research ( IF 6.5 ) Pub Date : 2022-03-11 , DOI: 10.1016/j.still.2022.105368
Stoécio Malta Ferreira Maia 1 , Aldair de Souza Medeiros 2 , Thiago Cândido dos Santos 2 , Guilherme Bastos Lyra 2 , Rattan Lal 3 , Eduardo Delgado Assad 4 , Carlos Eduardo Pellegrino Cerri 5
Affiliation  

Despite increasing efforts to combat climate change, greenhouse gas (GHG) emissions continued to grow. In this context, conservationist agricultural systems such as no-till (NT) can play an important role. However, the potential of this system to mitigate GHG emissions has been questioned more recently. Brazil is the second country with the largest NT area, representing around 18% of the global area under NT. Here, we examined the effects of the adoption of NT from the conversion of native vegetation, conventional tillage (CT), and pasture in layers 0–30 and 0–50 cm of the soil. We used a total of 124 comparison pairs to analyze changes in soil organic carbon (SOC) using two approaches (deriving SOC change factors and the adjustment of empirical equations on SOC temporal dynamics). Our results showed that the adoption of NT in NV areas reduces SOC stocks by between 4% and 8%. However, in areas previously managed by CT systems or pasture, NT is a potential alternative for promoting carbon sequestration in agricultural soils in Brazil's different regions. The results showed that the SOC accumulation is not restricted to superficial layers of the soil (0–30 cm) but was also effective up to 50 cm in depth, with gains varying between 9% and 25%. Thus, our results consistently demonstrate that for Brazilian conditions, NT when compared to CT systems or pastures, predominantly result in SOC gains, and represent an alternative to promote sustainable agriculture, which can contribute to the mitigation of GHG emissions and food security.



中文翻译:

免耕农业作为基于自然的巴西气候变化缓解解决方案的潜力

尽管为应对气候变化做出了越来越多的努力,但温室气体 (GHG) 排放量仍在继续增长。在这种情况下,免耕(NT)等保护主义农业系统可以发挥重要作用。然而,该系统减少温室气体排放的潜力最近受到质疑。巴西是北领地面积第二大的国家,约占全球北领地面积的 18%。在这里,我们检查了采用 NT 对 0-30 和 0-50 厘米土壤层的原生植被、常规耕作 (CT) 和牧场的转化的影响。我们总共使用了 124 个比较对,使用两种方法(推导 SOC 变化因子和调整 SOC 时间动态的经验方程)来分析土壤有机碳 (SOC) 的变化。我们的结果表明,在 NV 地区采用 NT 可使 SOC 库存减少 4% 到 8%。然而,在以前由 CT 系统或牧场管理的地区,NT 是促进巴西不同地区农业土壤碳固存的潜在替代方案。结果表明,土壤有机碳的积累不仅限于土壤表层(0-30 厘米),而且在 50 厘米深度也有效,增益在 9% 和 25% 之间变化。因此,我们的结果一致表明,对于巴西的条件,与 CT 系统或牧场相比,NT 主要导致 SOC 增益,并代表了促进可持续农业的替代方案,这有助于减少温室气体排放和粮食安全。NT 是促进巴西不同地区农业土壤碳固存的潜在替代方案。结果表明,SOC 积累不仅限于土壤表层(0-30 厘米),而且在 50 厘米深度也有效,增益在 9% 和 25% 之间变化。因此,我们的结果一致表明,对于巴西的条件,与 CT 系统或牧场相比,NT 主要导致 SOC 增益,并代表了促进可持续农业的替代方案,这有助于减少温室气体排放和粮食安全。NT 是促进巴西不同地区农业土壤碳固存的潜在替代方案。结果表明,土壤有机碳的积累不仅限于土壤表层(0-30 厘米),而且在 50 厘米深度也有效,增益在 9% 和 25% 之间变化。因此,我们的结果一致表明,对于巴西的条件,与 CT 系统或牧场相比,NT 主要导致 SOC 增益,并代表了促进可持续农业的替代方案,这有助于减少温室气体排放和粮食安全。结果表明,土壤有机碳的积累不仅限于土壤表层(0-30 厘米),而且在 50 厘米深度也有效,增益在 9% 和 25% 之间变化。因此,我们的结果一致表明,对于巴西的条件,与 CT 系统或牧场相比,NT 主要导致 SOC 增益,并代表了促进可持续农业的替代方案,这有助于减少温室气体排放和粮食安全。结果表明,SOC 积累不仅限于土壤表层(0-30 厘米),而且在 50 厘米深度也有效,增益在 9% 和 25% 之间变化。因此,我们的结果一致表明,对于巴西的条件,与 CT 系统或牧场相比,NT 主要导致 SOC 增益,并代表了促进可持续农业的替代方案,这有助于减少温室气体排放和粮食安全。

更新日期:2022-03-11
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