Determinants of litter accumulation and the abundance of litter-associated microarthropods in bird's nest ferns (Asplenium nidus complex) in the forest of Yambaru on Okinawa Island, southern Japan
Determinants of litter accumulation and the abundance of litter-associated microarthropods in bird's nest ferns (Asplenium nidus complex) in the forest of Yambaru on Okinawa Island, southern Japan
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DOI：
10.1007/s10310-006-0213-z
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发表时间：
2006-10
影响因子：
1.5
通讯作者：
S. Karasawa;N. Hijii
中科院分区：
文献类型：
--
作者：
S. Karasawa;N. Hijii
研究了日本南部冲绳北方山原森林中鸟巢蕨类植物（Aspleniumniduscomplex）的分布格局以及决定凋落物积累和蕨类植物中凋落物相关微型节肢动物丰度的因素。在一个典型的中国南方寒武纪地区，共发现53种鸟巢蕨（41种分布在13种27棵活树上，12种分布在5棵死树上）。4公顷样地，采集25棵活树上37种蕨类植物的凋落物样品，然后从所有凋落物样品中共提取出11205只微型节肢动物（阿卡里和弹尾目）。蕨类植物喜凹坡分布，且倾向于分布在具有高密度和/或大断面积特征的树种上。蕨类植物一般生长在大树上（树高≥ 10 m或胸径≥ 20 cm），但蕨类植物的数量和大小与寄主树的大小无关。蕨类植物中凋落物的积累量既不与宿主树的大小（高度和胸径）相关，也不与蕨类植物的高度和位置相关。凋落物的积累量仅与蕨类植物的大小呈显著正相关，这可能是导致蕨类植物的大小与凋落物相关的微型节肢动物丰度和甲螨种类数呈正相关的原因。
We studied the distributional pattern of bird's nest ferns (Asplenium niduscomplex) and the factors that determined litter accumulation and the abundance of litter-associated microarthropods in the ferns in the forest of Yambaru on the northern part of Okinawa Island, southern Japan. We located 53 bird's nest ferns (41 ferns on 27 live trees of 13 species, and 12 on 5 dead trees) in a ca. 4-ha plot, collected litter samples from 37 ferns on 25 live trees, and then extracted a total of 11205 microarthropods (Acari and Collembola) from all the litter samples. The ferns preferred concave slopes and tended to be distributed on the tree species that had the typical characteristics of high population density and/or large basal area in the forest. The ferns were usually established on large trees [≥10m high or ≥20cm diameter at breast height (DBH)], although the number and size of the ferns were not related to the size of the host trees. The amount of litter accumulated in the ferns was correlated neither with the size (height and DBH) of the host tree nor with the height and position of the ferns. The amount of accumulated litter had a significant positive correlation only with fern size; this might have caused the positive correlations between fern size and the abundance of litter-associated microarthropods and the number of species of oribatid mites in the ferns.