Farmers' interest in establishing agroforestry systems is increasing, as they are considered to have many benefits, such as the possibility of climate adaptation and crop diversification. Growing wood on agricultural land can produce biomass for energy or material purpose. Knowledge of the yield potential of the woody component in an agroforestry system is essential for informed decision making by farmers. The present study investigates the biomass production of the three poplar clones 'Max 1′, 'Koreana' and 'Hybride 275′ during the first 13 years (2008–2021) of their growth in a short rotation alley-cropping agroforestry system in Lower Saxony, Germany, on a vertic cambisol as well as a stagnosol soil. There was a high clonal effect on re-sprouting and mortality of the trees as well as on the mean annual dry matter (DM) woody biomass increment (MAI). Overall, 'Max 1′ showed highest re-sprouting, lowest mortality and highest MAI compared to the clones 'Hybride 275′ and 'Koreana'. The MAI of the three poplar clones was not affected by the rotation length of 3 or 6 years. Over the period of 13 years MAI of 'Max 1′ was 13.3 t Mg ha⁻¹ year⁻¹ DM, whereas that of 'Hybride 275′ and 'Koreana' was 10.2 and 9.8 t Mg ha⁻¹ year⁻¹ DM, respectively. The MAI was significantly determined by the factor harvest year. A low MAI was found for the 3-year rotation cycle in 2021, which was most possibly caused by drier and warmer than average vegetation periods in 2018–2020. Under the given site conditions, clone 'Max 1′ proved to be the most productive.

农民对建立混农林业系统的兴趣正在增加，因为它们被认为有很多好处，例如气候适应和作物多样化的可能性。在农业用地上种植木材可以产生用于能源或材料目的的生物质。了解农林系统中木质成分的产量潜力对于农民做出明智的决策至关重要。本研究调查了三个杨树无性系“Max 1”、“Koreana”和“Hybride 275”在下萨克森州短轮作农林复合系统中生长的前 13 年（2008-2021 年）的生物量生产，德国，在垂直的 cambisol 和 stagnosol 土壤上。克隆对树木的再发芽和死亡率以及平均年干物质 (DM) 木质生物量增量 (MAI) 有很高的影响。总体而言，与克隆“Hybride 275”和“Koreana”相比，“Max 1”显示出最高的再发芽率、最低的死亡率和最高的 MAI。三个杨树无性系的MAI不受3年或6年轮作长度的影响。在 13 年的时间里，“Max 1”的 MAI 为 13.3 t Mg ha⁻¹年⁻¹ DM，而 'Hybride 275' 和 'Koreana' 分别为 10.2 和 9.8 t Mg ha ⁻¹年⁻¹ DM。MAI 主要由因子收获年份决定。在 2021 年的 3 年轮换周期中发现了较低的 MAI，这很可能是由于 2018-2020 年的植被期比平均植被期更干燥和更温暖。在给定的场地条件下，克隆'Max 1'被证明是最高产的。