稀有绿绒蒿与同属绿绒蒿的生境分化及种群性状变异:对珍稀植物管理的启示

M. R. Poudeyal, S. K. Ghimire
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引用次数: 3

摘要

了解稀有的原因对植物物种的保护和管理变得越来越重要。本研究比较了喜马拉雅地区两种近缘种罂粟的空间分布、生境特征、种群大小和结构,即稀有的特有种Meconopsis napaulensis和广泛分布的同属种M. paniculata,以解释前者的稀有原因。本研究在尼泊尔中北部的朗塘国家公园进行,研究对象包括6个种群的napaulensis和4个种群的paniculata。生境特征分析表明,纳波勒松具有较高的生境特异性。它被限制在海拔3700米的贫瘠、开阔和岩石栖息地。在不同的采样点,在地理和地形特征上表现出较高的变异性。与napaulensis相比,paniculata的平均“占用面积”趋于高。与napaulensis相比,paniculata具有更大的种群规模和更大的丰度。尽管生殖成虫的比例很高,但在纳波ensis中较年轻的生命阶段的代表性较差,这表明招募潜力较低。目前的研究表明,m.a napaulensis的稀有与生态和地理限制密切相关,这些限制阻碍了它们的繁殖、扩散和定植。这进一步表明,稀有物种种群规模的维持在很大程度上取决于幼期植物的存活和丰度。因此,旨在减少对幼嫩阶段植物的影响和保护生殖个体不受开花和果实收获的管理将有助于维持种群规模。最后,制定行动计划和指导方针,将科学发现纳入考虑到与灭绝风险相关的当地人民的社会经济和文化因素,这对于保护稀有和特有物种是必不可少的。doi: http://dx.doi.org/10.3126/botor.v8i0.5959 Botanica Orientalis - Plant Science (2011) 8:57 -69
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Habitat differentiation and population traits variation between the rare Meconopsis napaulensis and the common congener M. paniculata: Implications for rare plant management
Understanding the causes of rarity has become increasingly important for the conservation and management of plant species. In this study, we compared spatial distribution, habitat characteristics, and population size and structure of two closely related species of poppy occurring in the Himalaya, the rare and endemic Meconopsis napaulensis and the widespread common congener M. paniculata in order to explain the causes of rarity of the former species. This study was carried out in Langtang National Park, north-central Nepal covering six populations of M. napaulensis and four populations of M. paniculata . Analysis of the habitat features revealed greater tendency of M. napaulensis to exhibit high habitat specificity. It was restricted to nutrient-poor, open and rocky habitats at >3700 m asl. Sites where M. paniculata were sampled showed high variability in terms of edaphic and topographic features. Mean ‘area of occupancy’ tended to be high for M. paniculata compared to M. napaulensis. M. paniculata showed larger population size and greater abundance as compared to M. napaulensis . The poor representation of younger life stages in M. napaulensis despite high proportion of reproductive adults indicated lower recruitment potential. The present study has illustrated that the rarity of M. napaulensis is strongly related to a combination of ecological and geographical constraints, which prevent reproduction, dispersal and colonization. It further demonstrates that the maintenance of population size of rare species largely depends on the survival and abundance of plants of younger stages. Thus, management directed towards reducing the impact on plants of young stages and protecting reproductive individuals from flower and fruit harvesting would help to maintain population size. Finally, development of action plans and guidelines incorporating scientific findings and accommodating local peoples’ socio-economic and cultural factors associated with the extinction risks is imperative for the conservation of rare and endemic species. doi: http://dx.doi.org/10.3126/botor.v8i0.5959 Botanica Orientalis – Journal of Plant Science (2011) 8: 57-69
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