Stand stratification and woody species diversity of a subtropical forest in limestone habitat in the northern part of Okinawa Island
Stand stratification and woody species diversity of a subtropical forest in limestone habitat in the northern part of Okinawa Island
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DOI：
10.1007/s10265-008-0162-z
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发表时间：
2008-05-01
影响因子：
2.8
通讯作者：
Hagihara, Akio
中科院分区：
文献类型：
--
作者：
Feroz, S. M.;Yoshimura, K.;Hagihara, Akio
对日本冲绳北方石灰岩生境亚热带森林的林分分层和木本物种多样性进行了研究。森林看台由四个建筑层组成。日本樟在各层中，特别是下层3层中，重要值最高，为优势种。虽然盐肤木Rhus succedanea L.是一个主要的顶层物种，它可能会消失，因为它在较低的两层。下两层植物区系组成相似，而上两层植物区系组成差异较大。各层的H'值从底层到第二层先增大后减小，J'值从底层向上一致地增大。Shannon指数H'和Pielou指数J'在林分水平上的值分别为4.27bit和0.74。从最上层向下累积高度差的H'和J'的变化趋势分别与石灰岩生境中现存森林各层的变化趋势相同。然而，这些趋势是相反的，从附近的亚热带森林中的硅酸盐栖息地，在那里的H'和J'的值的基础上的累积高度范围稳步下降，从底层向上。
Stand stratification and woody species diversity were studied in a subtropical forest in limestone habitat in the northern part of Okinawa Island, Japan. The forest stand consisted of four architectural layers. Cinnamomum japonicum Sieb. was the most dominant species as it had the highest importance value in all layers, especially in the lower three layers. Although Rhus succedanea L. was a major top-layer species, it might disappear because of its absence in the lower two layers. The lower two layers had similar floristic composition, while the composition of the top layer differed greatly from that of the lower two layers. The value of H' in each layer increased from the bottom to the second layer and then decreased, and the value of J' in each layer consistently increased from the bottom layer upward. The values of Shannon's index H' and Pielou's index J' were 4.27 bit and 0.74, respectively, at the stand level. The trends of H' and J' based on the cumulative height range from the top layer downward were, respectively, the same as those in each layer for the present forest in limestone habitat. However, these trends were opposite from those of a nearby subtropical forest in silicate habitat, where the values of H' and J' based on the cumulative height range decreased steadily from the bottom layer upward.