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C-sequestration and resilience to climate change of globe artichoke cropping systems depend on crop residues management
Agronomy for Sustainable Development ( IF 7.3 ) Pub Date : 2021-03-05 , DOI: 10.1007/s13593-021-00680-5
Paola A. Deligios , Roberta Farina , Maria Teresa Tiloca , Rosa Francaviglia , Luigi Ledda

Globe artichoke is one of the most intensively cultivated horticultural species in Mediterranean regions. In this context, sustainable agronomic management is a requisite to increase the soil carbon content, making the artichoke cultivation system more resilient to climate change. A 10-year experiment was considered to forecast the influence on soil C dynamic of three globe artichoke managements: monoculture with dry crop residues incorporation (conventional monoculture), monoculture with the inclusion of a cover crop (alternative monoculture), and rotation with cauliflower plus cover crop (biannual rotation). During the 2006–2016 period, total soil organic carbon content and plant C inputs to soil were measured. RothC model was used to predict the effect on the soil C stock and C sequestration potential in 20 years of the three managements tested in the field, plus a hypothetical conventional scenario with no residues’ incorporation (no residues). Plant C inputs increased according to the number of crops in rotation in each system, resulting 25% lower in conventional monoculture with respect to biannual rotation, whereas the C stock change was significantly higher (p < 0.01) in conventional and alternative monoculture (+ 7.57 and 7.14 t C ha-1) compared to biannual rotation (-1.03 t C ha-1). In the 20-year predictions, all the systems had a positive C balance. The soil organic carbon change (t C ha-1) for the future climate was + 7.2 for alternative monoculture and + 0.6 for monoculture with residues removals. For the first time, in this study, we clearly shown in the long term and in a climate change perspective that an improper crop residues management might lead to a loss of soil fertility in intensively cultivated horticultural soils under Mediterranean climate. The adoption of biannual rotation with cauliflower needs to be evaluated carefully because it proved to be less efficient in terms of C sequestration potential.



中文翻译:

朝鲜蓟种植系统的碳固存和对气候变化的适应力取决于作物残留管理

朝鲜蓟是地中海地区种植最密集的园艺物种之一。在这种情况下,可持续的农艺管理是增加土壤碳含量的必要条件,从而使朝鲜蓟栽培系统对气候变化的适应能力更强。考虑进行一项为期10年的实验,以预测三种朝鲜蓟管理对土壤碳动态的影响:单干种植并结合农作物残留(常规单种养殖),单种作物(包括覆盖作物)(替代单种养殖)以及花椰菜加轮作遮盖作物(半年轮换)。在2006–2016年期间,测量了土壤中总有机碳含量和植物C对土壤的投入。使用RothC模型预测了在田间测试的三种处理方法在20年内对土壤碳储量和碳固存潜力的影响,以及一个假设的常规情景,该实验没有残留物(无残留物)。植物碳的输入量根据每个系统中轮作作物的数量而增加,相对于一年两次的轮作,传统的单作种植降低了25%,而碳库的变化显着更高(与每半年轮换(-1.03 t C ha -1)相比 ,常规和替代单种养殖(p + 0.017)分别提高了7.57和7.14 t C ha -1。在20年的预测中,所有系统的C平衡都为正。土壤有机碳变化(t C ha -1),对于未来的气候,替代性单种养殖为+ 7.2,单种养殖为+ 0.6(带残留物去除)。在这项研究中,我们首次从长期和气候变化的角度清楚地表明,在地中海气候下,不适当的农作物残留管理可能会导致集约化园艺土壤中土壤肥力的丧失。需要仔细评估采用花椰菜每半年旋转一次的方法,因为事实证明,这种方法在固碳潜力方面效率较低。

更新日期:2021-03-05
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