Habitat Associations and Community Structure of Dipterocarps in Response to Environment and Soil Conditions in Brunei Darussalam, Northwest Borneo
Habitat Associations and Community Structure of Dipterocarps in Response to Environment and Soil Conditions in Brunei Darussalam, Northwest Borneo
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婆罗洲西北部文莱达鲁萨兰国龙脑香科植物的生境关联和群落结构对环境和土壤条件的响应
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
D. Burslem
中科院分区：
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作者：
R. Sukri;R. A. Wahab;K. A. Salim;D. Burslem
植物栖息地关联在婆罗洲低地热带森林中有很好的记录，但很少有研究对比不同地点之间的关联的普遍程度。我们研究了两个不同的婆罗洲低地混合双龙果林的生境关联和群落组成：Andulau（均匀地形，低海拔范围，沙质土壤）和Belalong（高度解剖地形，高海拔范围，富含粘土的土壤）。在每个站点沿地形梯度建立的20 m宽带样带中，对胸高直径≥1 cm的双龙心科树木进行了普查。安杜劳的双翅果密度、均匀度、物种丰富度和多样性均显著高于贝拉龙。37种双龙果中有19种（52%）与Andulau或Belalong有显著的位点关联。Belalong的双龙科群落组成与土壤养分浓度、植被和地形结构相关，而Andulau的双龙科群落组成与较少的生境变量相关。在各样地中，脊地的双翅果密度、物种丰富度和多样性均高于坡地和谷地。与地形生境显著的站点内关联在Andulau（10%）比Belalong（15%）更少见。结果表明，土壤和其他环境因子在局地尺度上影响着龙脑树群落的组成，并且在变化较大的环境中对龙脑树群落结构具有重要的驱动作用。然而，安杜劳地区小地块的龙脑树物种丰富度和多样性较高，表明在小尺度上，除环境异质性外，其他因素也对龙脑树物种丰富度差异有影响。
Plant habitat associations are well documented in Bornean lowland tropical forests, but few studies contrast the prevalence of associations across sites. We examined habitat associations and community composition of Dipterocarpaceae trees in two contrasting Bornean lowland mixed dipterocarp forests separated by approximately 100 km: Andulau (uniform topography, lower altitudinal range, sandy soils) and Belalong (highly dissected topography, higher altitudinal range, clay‐rich soils). Dipterocarpaceae trees ≥ 1 cm diameter at breast height (dbh) were censused in 20‐m wide belt transects established along topographic gradients at each site. Dipterocarp density, evenness, species richness, and diversity were significantly higher at Andulau than Belalong. Significant site associations (with either Andulau or Belalong) were detected for 19 (52%) of the 37 dipterocarp species tested. Dipterocarpaceae community composition at Belalong correlated with soil nutrient concentrations as well as measures of vegetation and topographic structure, but community composition at Andulau correlated with fewer habitat variables. Within each site, dipterocarp density, species richness, and diversity were consistently higher on ridges than in slopes and valleys. Significant within‐site associations to topographic habitats were less common at Andulau (10% of species tested) than at Belalong (15%). We conclude that edaphic and other environmental factors influence dipterocarp community composition at a local scale, and are more important drivers of community structure in the more variable environment at Belalong. Species richness and diversity of dipterocarps on small plots, however, were higher at Andulau, suggesting that factors other than environmental heterogeneity contribute to contrasts in dipterocarp tree species richness at small scales.