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Facilitation by a dwarf shrub enhances plant diversity of human-valued species at high elevations in the Himalayas of Nepal
Basic and Applied Ecology ( IF 3.8 ) Pub Date : 2021-04-18 , DOI: 10.1016/j.baae.2021.04.004
Rabindra Parajuli , Michael J. O'Brien , Bishnu Timilsina , Francisco I. Pugnaire , Christian Schöb , Suresh K. Ghimire

Facilitation is a global phenomenon that occurs when one species promotes the growth, survival, or reproduction of another species, mostly in stressful environments. However, the importance of facilitation by shrubs in maintaining plant community diversity is not well evaluated in the Himalayas, especially for the richness and conservation of medicinal and human-valued species. Therefore, we aimed to explore the facilitative role of a dwarf shrub species, Berberis angulosa, in maintaining plant composition and richness of human-valued species in the Langtang valley of Nepal's Himalayas. We censused plant species in open patches and beneath Berberis during monsoon and post-monsoon (dry) seasons at three elevations.

Total species richness and richness of human-valued species were significantly higher inside the Berberis canopy than in gaps; the former being 39% and the latter 46% greater under shrubs than in open sites. Facilitation by Berberis shrubs promoted plant community diversity irrespective of season and elevation; however, higher differences in mean species richness for both total plant species and human-valued species during the dry season and at high elevation indicated increased facilitation intensity under more stressful conditions. The facilitative effect of Berberis shrubs increased, combining both seasons, overall plant diversity by 19% (total=105), and human-valued species by 16% (total=56). Our results show the importance of facilitation by nurse shrubs in structuring plant communities and protecting medicinal and socio-ecologically important plants, thus enriching ecosystem services in the Himalayas. These results suggest nurse plant species should be incorporated into conservation policies and management strategies for effective biodiversity conservation and sustainability, especially in the face of climate change.



中文翻译:

矮灌木丛的促进促进了尼泊尔喜马拉雅山高海拔地区人类珍贵物种的植物多样性

便利化是一种全球现象,当一个物种在压力较大的环境中促进另一物种的生长,生存或繁殖时,就会发生这种现象。但是,在喜马拉雅山,人们并未很好地评估灌木促进维持植物群落多样性的重要性,特别是对于药用和人类珍贵物种的丰富和保护。因此,我们旨在探索矮灌木物种小Ber小Ber在维持尼泊尔喜马拉雅山郎塘谷的植物组成和人类珍贵物种的丰富性方面的促进作用。统计调查,我们在开放的补丁和下面的植物物种小檗在三个海拔在季风和岗位季风(干)的季节。

ber树冠内部的总物种丰富度和人类珍贵物种的丰富度明显高于空白处。前者在灌木下比裸地高39%,而后者在灌木下比后者高46%。小Ber灌木的促成作用促进了植物群落的多样性,而与季节和海拔无关。然而,在干旱季节和高海拔时,总植物物种和人类珍贵物种的平均物种丰富度差异更大,这表明在压力更大的条件下促进强度增加。小ber的促进作用灌木都增加了,这两个季节结合在一起,整个植物的多样性增加了19%(总数= 105),而人文珍贵的物种增加了16%(总数= 56)。我们的研究结果表明,在建立植物群落和保护药用和具有社会生态意义的重要植物方面,护士灌木的便利化非常重要,从而丰富了喜马拉雅山的生态系统服务。这些结果表明,应将护士植物物种纳入有效的生物多样性保护和可持续性的保护政策和管理策略中,尤其是面对气候变化时。

更新日期:2021-05-20
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