|| 要旨トップ | 本企画の概要 |||日本生態学会第70回全国大会 (2023年3月、仙台) 講演要旨
シンポジウム S10-3 （Presentation in Symposium）
Under the climate change, the increase of heavy precipitation is predicted and this increase of heavy rain is concerned to trigger frequent landslides. Therefore, the efficient strategy to accelerate re-vegetation of damaged ecosystem by landslide is urgently required. Plantation of the nitrogen (N)-fixing trees is one of the promising way to accelerate the forest recovery after severe disturbance. Although the legume is most-dominant group of the N-fixing plants, there are many non-legume N fixing plants across the world. However, the difference of plantation efficiency between legume and non-legume trees are little understood. To know the general conclusion about the intergroup efficiency of the two nitrogen fixing trees, it is necessary how the plantation efficiency differ across the variable environmental context. In this study we compared the plantation efficiency (survival rate) of Lespedeza bicolor (Fabaceae) and Alnus hirsuta (Betulaceae) after 15 artificial landslides established in variable environmental context in northern Hokkaido. In general, the survival rate of Alnus hirsute was higher than Lespedeza bicolor. While the soil type (either brown forest soil or serpentine soil) was the main driver of the differential survival rate of Alnus hirsute, slope angle, soil water contents, and soil texture were the determinant factors for the survival rate of Lespedeza bicolor. Interestingly, the survival rate of Lespedeza bicolor was higher at steeper slope as compared to the gentler slope, probably because of the less herbivory by deers at steeper slope. Our results indicates that for the efficient reforestation of post-landslide forests, it is necessary to understand the context dependent efficiency of plantation for a variety of nitrogen fixing trees.