Tree species composition and richness in a mature, warm-temperate riparian forest in Shikoku, Japan
Tree species composition and richness in a mature, warm-temperate riparian forest in Shikoku, Japan
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日本四国成熟暖温带河岸森林的树种组成和丰富度
DOI：
10.1007/s11355-022-00497-8
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发表时间：
2022
影响因子：
2
通讯作者：
Ishikawa Shingo
中科院分区：
文献类型：
--
作者：
Akiyama Kotone;Higa Motoki;Ishikawa Shingo
在日本的寒温带地区，河岸森林往往有很高的树种丰富度，但这一趋势在暖温带地区是否一致尚不清楚。在这里，我们评估了三个地形单元的树种丰富度和森林结构，这些单元反映了日本西南部一片成熟的常绿阔叶林中从山脊到山谷的坡度(坡顶和上坡和下坡)。我们建立了一个0.59公顷的谷底地块，主要由一个较低的坡度单元组成，然后对所有胸径为 >； 5 cm的活树进行了调查和绘制。将得到的组成和物种丰富度数据与日本环境部提供的包括坡顶和上坡单元在内的相邻永久地块的数据进行了比较。在谷底，泥石流梯田的乔木密度最高，是阔叶落叶乔木的重要生境。树种组成大体相似，几乎所有树种都出现在每个地形单元中。但不同地形单元的物种密度存在明显差异，最低密度出现在下坡单元。物种面积曲线表明，下坡单元的树种丰富度最低。种-个体曲线表明，三个单元的总物种丰富度非常接近。即使包括杂草，低坡度单元的林下物种丰富度仍然很低。我们的结果表明，暖温带地区的阔叶常绿河岸林与阔叶落叶寒温带森林不同，并不一定与物种丰富度有关。
In cool-temperate regions of Japan, riparian forests tend to have high tree species richness, but it is unknown if this trend is consistent in warm-temperate regions. Here, we assessed tree species richness and forest structure in three topographic units reflecting the ridge to valley gradient (slope crests and upper and lower slopes) in a mature broadleaf evergreen forest in southwest Japan. We established a 0.59-ha valley bottom plot that was primarily comprised of a lower slope unit, then surveyed and mapped all living trees with a diameter at breast height > 5 cm. Resulting compositional and species richness data were compared to those from an adjacent permanent plot that included the slope crest and upper slope units, provided by the Japanese Ministry of the Environment. In the valley bottom, debris flow terraces had the highest tree density and served as important habitat for broadleaf deciduous trees. Tree species compositions were broadly similar in that nearly all species were found in each topographic unit. However, there were obvious differences in species densities among topographic units, with the lowest densities found in the lower slope unit. Species–area curves indicated that tree species richness was lowest in the lower slope unit. Species–individual curves indicated that all three units had very similar total species richness. Even when forbs were included, understory species richness in the lower slope unit remained low. Our results suggest that unlike broadleaf deciduous cool-temperate forests, broadleaf evergreen riparian forests in warm-temperate regions may not necessarily relate to greater species richness.
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