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首页> 外文期刊>Plant and Soil >Harvesting forage of the perennial grain crop kernza (Thinopyrum intermedium) increases root biomass and soil nitrogen cycling
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Harvesting forage of the perennial grain crop kernza (Thinopyrum intermedium) increases root biomass and soil nitrogen cycling

机译：收获常年谷物作物杏仁（薄孔中间）的饲料增加了根生物质和土壤氮循环

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Background and aimsEmerging perennial grain crops yield less grain than annual crops, but the economic viability of these perennial systems could be improved if both forage and grain are harvested. However, the belowground consequences of forage removal in perennial grain systems are unknown. This study aimed to determine the effect of the additional harvest of forage biomass on overall plant biomass allocation and labile soil C and N dynamics within a perennial grain dual-use system.MethodsPlant biomass and associated soil samples of a perennial grain [Kernza (Thinopyrum intermedium)] were taken monthly over the first three growing seasons under three harvest regiments: No Cut (0x), Summer Cut (1x), and Summer and Fall Cut (2x).ResultsThe harvesting of forage biomass significantly increased both above- and belowground biomass. The once and twice forage-harvested treatments averaged 39% and 73% greater root biomass in 2016 and 39% and 49% greater root biomass in 2017 relative to the treatment not harvested for forage. Soil indicators of carbon and nitrogen storage were not affected by forage harvest but mineralizable carbon, an indicator of nutrient cycling, was greater under the forage harvested treatments.ConclusionsThe harvest of forage and grain promoted nutrient availability and overall productivity (forage, root and grain biomass) relative to harvesting for grain only. Our findings suggest dual-use management of Kernza can provide a productive and profitable pathway for perennial grain adoption.
机译：背景和旨在常年谷物作物产量比年度作物的谷物少，但如果收获牧草和谷物，这些多年生系统的经济可行性可以得到改善。然而，在多年生晶粒系统中觅食地移除的以下后果未知。本研究旨在确定肢体谷物两用系统中饲料生物质额外收获对整个植物生物质分配和不稳定土壤C和N动力学的影响。常年谷物的方法和相关土壤样品[Kernza（薄孔中间）]在三个收获方案下，在前三个生长季节被每月拍摄：没有切割（0x），夏季切割（1x），夏季和跌落（2x）。饲料生物量的收获显着增加 - 下面和地下生物质。一次和两次的牧草收获的治疗在2016年平均平均为39％和73％，2017年的39％和49％的根生物量相对于未收获的饲料未收获的处理。碳酸氮和氮气储存的土壤指示量不受饲料收获的影响，但营养循环的指标在饲料收获的处理下更大。饲料和谷物的收获促进营养可用性和整体生产率（饲料，根和谷物生物质）相对于仅收获谷物。我们的研究结果表明，Kernza的双重使用管理可以为常年谷物采用提供生产性和有利可图的途径。

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