Effects of snow-load and shading by vascular plants on the vertical growth of hummocks formed by Sphagnum papillosum in a mire of northern Japan
Effects of snow-load and shading by vascular plants on the vertical growth of hummocks formed by Sphagnum papillosum in a mire of northern Japan
复制标题
雪荷载和维管束植物遮荫对日本北部泥沼中乳状泥炭藓形成的小丘垂直生长的影响
DOI：
10.1007/s11258-012-0065-x
复制
发表时间：
2012
期刊：
影响因子：
1.7
通讯作者：
Yabe K.
中科院分区：
文献类型：
--
作者：
Yazaki T.;Yabe K.
沼泽中的丘丘泥炭藓物种的生长取决于水文和气候条件，在不同的地理区域中发现了不同的丘丘形态。我们研究了日本冷温带沼泽中植物遮荫和冬季积雪如何调节泥炭藓丘丘的生长模式和高度。两年内对小丘进行了四次处理（每年每个处理 1 个小丘）：无处理（对照）、无雪荷载 (S)、维管植物修剪 (T) 以及无雪荷载和维管植物修剪组合 (S&T)。此外，还研究了维管植物覆盖和积雪对小丘垂直生长和高度的影响。 S的年增长率。对照组的乳头直径 (34–41 mm) 高于 S&T 处理，并且在单独的 S 和 T 处理中处于中间位置。与维管植物生长的丘丘相反，维管植物修剪的丘丘显示出地下水位深度（从头状花序到地下水位的测量）和泥炭藓生长之间呈负相关。因此，在夏季，维管束植物的遮荫可以防止干燥并促进泥炭藓的生长。积雪覆盖的山丘重量下降了 3 至 11 厘米。融雪后，芽在允许生长的地下水位深度范围内继续生长。因此，冬季的重雪可能会压低靠近地下水位的山丘表面，从而刺激泥炭藓的生长，从而导致山丘高度的恢复。因此，夏季干燥引起的水分胁迫对于调节夏季干燥和冬季降雪的沼泽丘丘高度上限至关重要。
The growth of hummockSphagnumspecies in bogs depends on hydrological and climatic conditions, with different hummock morphologies being found across geographical regions. We investigated how plant shade and winter snow-load regulate the growth pattern and height ofSphagnum papillosumhummocks in a cool-temperate bog in Japan. Hummocks were subjected to four treatments across 2 years (1 hummock per treatment per year): no treatment (control), snow-load-free (S), vascular plant trimming (T), and snow-load-free and vascular plant trimming in combination (S&T). Further, the effects of vascular plant cover and snow -load on the vertical growth and height of hummocks were examined. Annual growth rates ofS. papillosumwere higher for the control (34–41 mm) than S&T treatment, and were intermediate for separate S and T treatments. In contrast to vascular plant-growing hummocks, vascular plant-trimmed hummocks showed a negative correlation between water-table depth (measured from the capitulum to the water-table) andSphagnumgrowth. Hence, in summer, shading by vascular plants may prevent desiccation and facilitate the growth ofSphagnum. Snow-loaded hummocks were weighed down by 3–11 cm. After snowmelt, the shoots continued to grow within the water-table depth range that allowed growth. Hence, heavy winter snow-loads may depress the surfaces of hummocks closer to the water-table, which stimulatesSphagnumgrowth, resulting in the recovery of hummock height. Thus, the water stress caused by summer desiccation is critical in regulating the upper limit of hummock height in bogs subject to dry summer conditions and heavy winter snowfall.