Seasonal variation in leaf-litter input and leaf dispersal distances to streams: the effect of converting broadleaf riparian zones to conifer plantations in central Japan
Seasonal variation in leaf-litter input and leaf dispersal distances to streams: the effect of converting broadleaf riparian zones to conifer plantations in central Japan
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落叶输入和树叶到溪流的扩散距离的季节性变化：日本中部阔叶河岸带转变为针叶树种植园的影响
DOI：
10.1007/s10750-010-0520-4
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发表时间：
2011
期刊：
影响因子：
2.6
通讯作者：
S. Hattori
中科院分区：
文献类型：
--
作者：
Tsutomu Kanasashi;S. Hattori
Sugi(Cryptomeria Japan onicaD.)是日本最重要的常绿针叶人工林树种之一。许多原本以落叶阔叶树为主的河岸森林已被改造成Sugi种植园。本研究调查了落叶输入和树叶向溪流扩散的季节性，以评估将河岸林转变为Sugi种植园的效果。在名古屋大学森林的三条溪流上对凋落物输入的季节性进行了评估。在一条以落叶阔叶树为主的溪流中，输入仅限于秋季。在杉木人工林的两条溪流中，从秋季到早春，输入持续时间延长，从冬季到早春，输入以杉木针叶为主。这些结果表明，Sugi种植园改变了来自河岸森林的落叶输入的季节性，并影响了河流生态系统。通过考虑树叶从三个林层到溪流的扩散距离和落叶输入到两个溪流之间的关系来评估树叶的扩散。落叶阔叶树在10月中旬至11月的最大散叶距离为26-28米，12-4月落叶阔叶树的最大散叶距离为10-12米。树种不同，树叶扩散距离也不同。落叶阔叶树中有4种树种的叶散布程度大于杉木。针叶的平均重量大于阔叶树叶的平均重量，在冬季和早春依靠强风散布。虽然树叶与林下的距离在2-4米内，但它可能是树叶凋落物输入溪流的重要来源。
Sugi (Cryptomeria japonicaD. Don) is one of the most important evergreen coniferous plantation species in Japan. Much of the riparian forest that was originally dominated by deciduous broadleaf trees has been converted into sugi plantations. The present study investigated the seasonality of leaf-litter input and leaf dispersal to streams to assess the effects of converting riparian forest to sugi plantations. The seasonality of leaf-litter input was assessed at three streams in Nagoya University Forest. At one stream dominated by deciduous broadleaf trees, input was limited to autumn. At two streams in a sugi plantation, input was prolonged from autumn to early spring, and was dominated by sugi needles from winter to early spring. These results suggest that sugi plantations alter the seasonality of leaf-litter input from riparian forests and affect stream ecosystems. Leaf dispersal was assessed by considering the relationship between leaf dispersal distance from three forest layers to the stream and leaf-litter input into two streams. The maximum leaf dispersal distance was 26–28 m for deciduous broadleaf trees from mid-October to November and 10–12 m for sugi needles from December to April. Leaf dispersal distance depended on the tree species. Four species of deciduous broadleaf tree showed greater leaf dispersal than that of sugi. The mean weight of individual sugi needles was higher than that of the broadleaf trees’ leaves, and dispersal depended on strong winds in winter and early spring. Although the leaf dispersal distance from the understory was within 2–4 m, it could be a significant source of leaf-litter input to streams.
影响因子：
3.7
作者：
Komatsu, Hikaru;Kume, Tomonori;Otsuki, Kyoichi
通讯作者：
Otsuki, Kyoichi