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首页> 外文期刊>Ecological research >Effects of belowground vertical distribution of a herbivore on plant biomass and survival in Lolium perenne
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Effects of belowground vertical distribution of a herbivore on plant biomass and survival in Lolium perenne

机译：草食动物地下垂直分布对多年生黑麦草植物生物量和存活的影响

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Root herbivory affects plant performance, but the effects are not well understood. We tested the effects of the vertical distribution of a root-feeding beetle larva (Anomala cupred) by restricting its access to the top, middle, or bottom zone in pots of perennial ryegrass (Lolium perenne) or by allowing unrestricted access. We predicted that plant mortality, biomass, and biomass allocation should change with the zone of root herbivory, because both the magnitude of root loss and the consequences of such loss are specific to the point of damage. Seven of nine plants died in each treatment in which the larvae had access to the top zone. In contrast, no plants died when larvae occupied the middle or bottom zones. Plants were killed when the larvae grazed the root base and severed the shoots from the roots. Moreover, total plant biomass and biomass allocation to roots were significantly lower when the larvae were confined to the top and middle feeding zones. The greatest number of roots were removed when the larvae occupied the top feeding zone. Thus, the vertical distribution of a belowground herbivore is crucially important to plant fate. In nature, most belowground herbivores are concentrated near the soil surface, and thus the effects of belowground herbivory are often more severe than the effects of aboveground herbivory.
机译：根食草会影响植物的生长，但效果尚不十分清楚。我们通过限制其进入多年生黑麦草（黑麦草）盆的顶部，中部或底部区域的访问权限或允许无限制访问权限，来测试根部喂养的甲虫幼虫（Anomala圆锥形）的垂直分布的影响。我们预测植物的死亡率，生物量和生物量的分配应随食草根的区域而变化，因为根部损失的程度和这种损失的后果都是针对损害点的。在每种处理中，九种植物中有七种死亡，其中幼虫可以进入顶部区域。相反，当幼虫占据中部或底部时，没有植物死亡。当幼虫放牧根基并从根上切断芽时，杀死植物。此外，当幼虫被限制在上部和中部饲喂区时，植物总生物量和根部生物量分配显着降低。当幼虫占据顶部饲喂区时，去除了最大数量的根。因此，地下草食动物的垂直分布对于植物命运至关重要。在自然界中，大多数地下食草动物集中在土壤表面附近，因此，地下食草动物的影响通常比地面食草动物的影响更为严重。

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