Breakdown and macroinvertebrate colonization of needle and leaf litter in conifer plantation streams in Shikoku, southwestern Japan
Breakdown and macroinvertebrate colonization of needle and leaf litter in conifer plantation streams in Shikoku, southwestern Japan
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DOI：
10.1007/s10310-010-0210-0
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发表时间：
2011-04
影响因子：
1.5
通讯作者：
Mayu Hisabae;Shinzaburo Sone;Mikio Inoue
中科院分区：
文献类型：
--
作者：
Mayu Hisabae;Shinzaburo Sone;Mikio Inoue
利用落叶袋对流经北京地区针叶林的两个研究点的针叶(Cryptomeria Japan Onica)和落叶阔叶树(Euptela Polyandra)的分解和大型无脊椎动物定殖进行了研究。日本四国，日本西南部(一个地点有针叶树冠，另一个地点有针叶和阔叶树的混合树冠)。比较了凋落物种类(针叶和阔叶)和两个地点(针叶和混合树冠)之间的破碎率和大型无脊椎动物密度，以确定(1)阔叶的破碎率是否高于针叶，(2)大型无脊椎动物是否喜欢阔叶而不是针叶，(3)河岸冠层的差异是否反映在大型无脊椎动物的丰度上。结果表明，阔叶的腐解率高于针叶，表明针叶作为大型无脊椎动物的食物品质较差。针叶和阔叶之间的大型无脊椎动物密度的差异与破碎率的差异基本一致：阔叶的密度往往高于针叶，这表明针叶不是大型无脊椎动物的首选。然而，针叶林和混交林的大型无脊椎动物总密度并没有显著差异，尽管碎片机上的优势类群有所不同(针叶林：伽马线虫；混交林：鳞口类)。尽管针叶树针对于大型无脊椎动物来说是低质量的食物，但这可能会提供一些好处。针叶树的针叶在河床上停留的时间更长，因为它们的破坏率较低，是一种持续可用的资源。此外，针叶树凋落物的积累可以有效地捕获和保留颗粒状有机物。
Breakdown and macroinvertebrate colonization of conifer needles (Cryptomeria japonica) and deciduous broadleaves (Euptelea polyandra) were investigated using litter bags in two study sites in streams flowing through a conifer plantation ofC. japonicain Shikoku, southwestern Japan (one site with conifer canopy and another with mixed conifer and broadleaved canopy). Breakdown rates and macroinvertebrate densities were compared between litter species (conifer needle vs broadleaf) and between the two sites (conifer vs mixed canopy) to determine (1) whether breakdown rate of broadleaves is higher than conifer needles, (2) whether macroinvertebrates prefer broadleaves to conifer needles, and (3) whether the difference in riparian canopy is reflected in macroinvertebrate abundance. The results indicated that breakdown rates of broadleaves were higher than those of conifer needles, suggesting poorer quality of the latter as food for macroinvertebrates. Differences in macroinvertebrate density between needles and broadleaves were generally consistent with those in breakdown rates: broadleaves tended to have higher densities than needles, suggesting that conifer needles were not preferred by macroinvertebrates. However, total macroinvertebrate density in the conifer site was not significantly different from that in the mixed site, although the dominant shredder taxon differed (conifer site: gammarids; mixed site: lepidostomatids). Although conifer needles are low-quality food for macroinvertebrates, this may offer some advantages. Conifer needles remain on the streambed for longer periods owing to their lower breakdown rates, being a constantly available resource. In addition, accumulations of conifer litter may effectively trap and retain particulate organic matter.