外来植物桔梗亚种的潜在生境评价。琵琶湖岸有效波高与地面高度关系的六边形分析

Shuhei Tanaka, W. Takami, Tomoya Tabuchi, H. Onishi, N. Tsuji, T. Matsuoka, Hiroaki Nishikawa, S. Fujii
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引用次数: 1

摘要

摘要利用便携式GPS点定位装置对外源植物大花叶(Ludwigia grandflora subsp)进行了植被调查。从2015年到2016年,在琵琶湖岸边的132个社区进行了调查。利用琵琶湖周边6个观测站的风速、风向和有效提取数据,研究了有效波高与外来植物生长地平面的关系。主要研究结果如下:1)桔梗亚属;在显著波高大于18 cm的群落中未观察到六瓣草;在55个社区观察到六瓣草。根据观察到外来植物的地面高度,它们被分为四组。在Biwako水面(B.S.L.) -150 ~ -50 cm处,有20个群落存在淹没型。在bsl -90 ~ -30 cm的14个群落中发现了羽化型。15个群落(B.S.L. -50 ~ -30 cm)为过渡带型,6个群落(B.S.L. -30 ~ -10 cm)为陆地型。3)淹没型、浮出型和过渡带型的平均有效波高分别为5.5 cm、9.4 cm和13.2 cm。显著波高可能是控制外来植物生长的地面水平的因素之一。
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Estimation of Potential Habitat for Specific Alien Plant Ludwigia grandiflora subsp. hexapetala Considering Relationship between Significant Wave Height and Ground Level on Lake Biwa Shore
Abstract Vegetation surveys with portable point positioning GPS devices were carried out for a specific alien plant, Ludwigia grandiflora subsp. hexapetala, at 132 communities on the shore of Lake Biwa from 2015 to 2016. The relationship between significant wave height and ground level where the alien plant grew was studied using a database of wind speed, wind direction, and effective fetch at six observation stations around Lake Biwa. The main results are as follows: 1) Ludwigia grandiflora subsp. hexapetala was not observed at communities with significant wave height was greater than 18 cm, 2) Ludwigia grandiflora subsp. hexapetala was observed at 55 communities. They were classified into four groups on the basis of the ground level where the alien plant was observed. The submerged type was found in 20 communities (from Biwako Surface Level (B.S.L.) -150 to -50 cm). The emerged type was found in 14 communities (from B.S.L. -90 to -30 cm). The ecotone type was found in 15 communities (from B.S.L. -50 to -30 cm), and the land type was found in six communities (from B.S.L. -30 to -10 cm), 3) The average significant wave height was 5.5 cm, 9.4 cm, and 13.2 cm, respectively, for submerged, emerged, and ecotone types. The significant wave height might be one of the factors governing the ground level at which the alien plant grows.
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