Liu Run Hong, Chang Bin, Rong Chun Yan, Jiang Yong, Yang Rui An, Liu Xing Tong, Zeng Hui Fang, Fu Gui Huan
Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education/College of Life Science, Guangxi Normal University, Guilin 541006, Guangxi, China.
Ying Yong Sheng Tai Xue Bao. 2018 Dec;29(12):3917-3926. doi: 10.13287/j.1001-9332.201812.001.
To understand the niche characteristics of main woody species in Pterocarya stenoptera community, we investigated P. stenoptera communities in riparian zone of Lijiang River, China. The niche characteristics of main species in tree layers and shrub layers were quantified with the indices of Levins niche breadth, Shannon niche breadth, Schoener niche similarities and Pianka niche overlap. The results showed that P. stenoptera in the tree layer, and Ficus abelii and Morus alba in the shrub layer had higher niche breadth than other species. The species with larger importance values generally had larger niche breadth, but the rank orders of which were not exactly the same. The niche similarity of main populations in the tree layer was generally smaller than that in the shrub layer. The mean value of niche similarity of main populations in the tree layer and shrub layer was 0.151 and 0.236, respectively. There was a low degree of niche similarity among species within the community, indicating that they had a low similarity in resource use. The niche overlap of main populations in the tree layer was generally smaller than that in the shrub layer, with the mean value of niche overlap of main populations in the tree layer and shrub layer being 0.217 and 0.273, respectively. The niche overlap between the main species in the community was relatively lower. There was no significant correlation between niche breadth and niche similarity. The species with larger niche breadth often had more opportunities to overlap with other species. However, their overlap value was not necessarily larger. Larger niche similarity was often associated with higher degrees of niche overlap. The P. stenoptera community in riparian zone of Lijiang River was the climax community, the relationship among species was relatively stable, the population regeneration was very slow, and the development trend of this community was declining in the future.
为了解枫杨群落主要木本植物的生态位特征，我们对中国漓江沿岸带的枫杨群落进行了调查。采用Levins生态位宽度指数、Shannon生态位宽度指数、Schoener生态位相似性指数和Pianka生态位重叠指数对乔木层和灌木层主要物种的生态位特征进行了量化。结果表明，乔木层的枫杨以及灌木层的黄毛榕和桑树的生态位宽度高于其他物种。重要值较大的物种通常具有较大的生态位宽度，但其排序并不完全相同。乔木层主要种群的生态位相似性一般小于灌木层。乔木层和灌木层主要种群生态位相似性的平均值分别为0.151和0.236。群落内物种间生态位相似程度较低，表明它们在资源利用上的相似性较低。乔木层主要种群的生态位重叠一般小于灌木层，乔木层和灌木层主要种群生态位重叠的平均值分别为0.217和0.273。群落主要物种间的生态位重叠相对较低。生态位宽度与生态位相似性之间无显著相关性。生态位宽度较大的物种往往有更多机会与其他物种重叠。然而，它们的重叠值不一定更大。较大的生态位相似性往往与较高程度的生态位重叠相关。漓江沿岸带的枫杨群落为顶极群落，物种间关系相对稳定，种群更新非常缓慢，该群落未来呈衰退趋势。
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