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Cereal-legume mixtures increase net CO2 uptake in a forage crop system in the Eastern Pyrenees
Field Crops Research ( IF 5.8 ) Pub Date : 2021-08-20 , DOI: 10.1016/j.fcr.2021.108262
Mercedes Ibañez 1, 2 , Núria Altimir 2 , Àngela Ribas 2, 3, 4 , Werner Eugster 5 , M.-Teresa Sebastià 1, 2
Affiliation  

Forage systems are the major land use and provide essential resources for animal feeding. Assessing the influence of annual forage crop species on net ecosystem CO2 exchange (NEE) is key to develop management strategies that can help to mitigate climate change, while optimizing productivity of these systems. However, little is known about the effect of annual forage crop species on CO2 exchange fluxes, considering separately net CO2 balances during the growth and fallow periods, and species ecophysiological responses. Our study assesses the influence of cereal monocultures vs. cereal‑legume mixtures on (1) ecosystem‑scale CO2 fluxes, for the whole crop season and separately for the two periods of growth and fallow; and (2) potential sensitivities of CO2 exchange related to short-term variations in light, temperature, and soil water content. This is the first mid‑term (seven years) ecosystem‑scale CO2 fluxes assessment of an intensively managed forage system in the Pyrenees region. Our results provide strong evidence that cereal‑legume mixtures lead to higher net CO2 uptake than cereal monocultures, as a result of higher gross CO2 uptake, while respiratory fluxes did not significantly increase. Also, cereal-legume mixtures favoured a higher voluntary regrowth during the fallow period, which was decisive for the cumulative net CO2 uptake of the entire crop season. Overall, cereal‑legume mixtures enhanced net CO2 sink capacity of the forage crop, while ensuring productivity and forage quality.



中文翻译:

谷物-豆类混合物增加了东比利牛斯草料作物系统中二氧化碳的净吸收

草料系统是主要的土地用途,为动物饲养提供必要的资源。评估一年生草料作物物种对净生态系统 CO 2交换 (NEE) 的影响是制定有助于缓解气候变化同时优化这些系统生产力的管理策略的关键。然而,对一年生牧草作物物种对 CO 2交换通量的影响知之甚少,分别考虑生长和休耕期间的净 CO 2平衡以及物种生态生理响应。我们的研究评估了谷物单一栽培谷物-豆类混合物对 (1) 生态系统规模 CO 2 的影响通量,用于整个作物季节和分别用于生长和休耕的两个时期;(2) CO 2交换的潜在敏感性与光、温度和土壤含水量的短期变化有关。这是对比利牛斯山地区集约化管理的饲草系统进行的首次中期(七年)生态系统规模的 CO 2通量评估。我们的结果提供了强有力的证据,表明谷物 - 豆科植物混合物比谷物单一栽培导致更高的净 CO 2吸收,这是由于更高的 CO 2总吸收量,而呼吸通量没有显着增加。此外,谷物 - 豆类混合物有利于休耕期间更高的自愿再生,这对累积净 CO 2 起决定性作用吸收整个作物季节。总体而言,谷物-豆类混合物提高了牧草作物的净 CO 2汇能力,同时确保了生产力和牧草质量。

更新日期:2021-08-20
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