Emerald ash borer (EAB) (Agrilus planipennis) has had an extensive impact across North America. It is currently present in Minnesota, USA but has not been observed in northern portions of the state where the vast majority of black ash (Fraxinus nigra) trees are located. Unlike other ash forest communities, the black ash forest type occurs in wetlands and is dominated by black ash with few associate species. Because of this, the loss of black ash can result in changes to the hydrological regime and species composition. The goal of this study was to quantify the structure and composition of regeneration 5 to 11 years post-harvest in three silvicultural systems (group selection, clearcut, and diameter-limit harvesting) to evaluate the potential for establishment of other tree species. Overall, regeneration post-harvest was high but variable across all systems. Across silvicultural systems, there was no significant relationships between residual overstory trees (> 10 cm dbh) basal area and non-ash regeneration TPH, indicating flexibility in designing treatments for diversification. Populus sapling (2.54–10 cm) density was significantly negatively correlated to the depth of the soil muck layer. In contrast, a positive relationship was observed between depth of the soil muck and black ash saplings. These findings indicate that specific silvicultural systems in combination with site quality (e.g., clearcuts on high-quality sites with shallow muck layers) may help to promote non-ash species in black ash forests that are threatened with EAB.

翡翠虫（EAB）（Agrilus planipennis）已在整个北美产生了广泛影响。目前，它存在于美国明尼苏达州，但在该州的北部地区未见到，该州的大部分黑灰（Fraxinus nigra）树木位于。与其他灰森林社区不同，黑灰森林类型发生在湿地中，以黑灰为主，伴生物种很少。因此，黑灰的损失会导致水文状况和物种组成的变化。这项研究的目的是在三个造林系统（群体选择，明确和直径限制收获）中量化收获后5至11年的再生结构和组成，以评估建立其他树种的潜力。总体而言，收获后的再生率很高，但在所有系统中都不同。在整个造林系统中，剩余的过高的树木（> 10 cm dbh）的基础面积与非灰分再生的TPH之间没有显着的关系，这表明在设计多样化的处理方法时具有灵活性。杨树幼树（2.54–10 cm）的密度与土渣层的深度显着负相关。相反，在土渣深度和黑灰树苗之间观察到正相关。这些发现表明，特定的造林系统与场地质量相结合（例如，在具有浅土层的高质量场地上进行砍伐）可能有助于在受到EAB威胁的黑灰森林中促进非灰烬物种。