Species-habitat associations in a Sri Lankan dipterocarp forest
Species-habitat associations in a Sri Lankan dipterocarp forest
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DOI：
10.1017/s0266467406003282
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发表时间：
2006-07-01
影响因子：
1.4
通讯作者：
Ashton, P. S.
中科院分区：
文献类型：
--
作者：
Gunatilleke, C. V. S.;Gunatilleke, I. A. U. N.;Ashton, P. S.
森林结构和物种分布格局进行了研究，在8个地形定义的栖息地的205个物种的树干>= 1厘米胸径栖息在一个25公顷的地块在Sinharaja雨林，斯里兰卡。栖息地是陡峭的马刺，不太陡峭的马刺，陡峭的冲沟和不太陡峭的冲沟，都在较低或较高的海拔。平均干密度显着大于上马刺比在较低的，不太陡峭的冲沟。茎密度也高于马刺比在每个海拔类别内的冲沟，并在每个高海拔栖息地比在其相应的低海拔栖息地。断面积的栖息地之间的变化较小，但遵循类似的趋势，干密度。物种丰富度和Fisher's alpha值在高海拔生境中比在低海拔生境中低。这些差异似乎与优势种的丰度有关。在接受环面翻译测试的125个物种中，有99个物种（丰度和丰度较低以及不同地层中的物种）与一个或多个栖息地至少表现出一种正相关或负相关。物种协会相对更频繁的低海拔沟壑。这些和以前的研究结果幼苗生态生理学，形态学和解剖学的声音的栖息地专家建议，土壤和水文地形相关的变化，伴随着不同的强度，类型和程度的树冠干扰沿着链状景观，在这片森林的栖息地分区中发挥了重要作用。
Forest structure and species distribution patterns were examined among eight topographically defined habitats for the 205 species with stems >= 1 cm dbh inhabiting a 25-ha plot in the Sinharaja rain forest, Sri Lanka. The habitats were steep spurs, less-steep spurs, steep gullies and less-steep gullies, all at either lower or upper elevations. Mean stem density was significantly greater on the upper spurs than in the lower, less-steep gullies. Stem density was also higher on spurs than in gullies within each elevation category and in each upper-elevation habitat than in its corresponding lower-elevation habitat. Basal area varied less among habitats, but followed similar trends to stem density. Species richness and Fisher's alpha were lower in the upper-elevation habitats than in the lower-elevation habitats. These differences appeared to be related to the abundances of the dominant species. Of the 125 species subjected to torus-translation tests, 99 species (abundant and less abundant and those in different strata) showed at least one positive or negative association to one or more of the habitats. Species associations were relatively more frequent with the lower-elevation gullies. These and the previous findings on seedling ecophysiology, morphology and anatomy of sonic of the habitat specialists suggest that edaphic and hydrological variation related to topography, accompanied by canopy disturbances of varying intensity, type and extent along the catenal landscape, plays a major role in habitat partitioning in this forest.