在Tagetes minuta入侵的植物群落中的物种多样性模式,沿着Xizang东南部的海拔梯度
Norzin Tso1,2, Ngawang Norbu1,2, Wei Li1,2
1Key Laboratory of Biodiversity and Environment on the Qinghai-Tibetan Plateau, Ministry of Education, School of Ecology and Environment, Xizang University, Lhasa, China.
PeerJ
|January 13, 2026
概括
侵袭性Tagetes minuta in Xizang主要影响植物社区的均性,而不是丰富性. 高度不会显著影响多样性,但人类的干扰会提高入侵的成功.
科学领域:
- 生态生态学 生态生态学
- 侵入性物种 生物学 生物学
- 植物社区动态 植物社区动态
背景情况:
- 南美草本植物Tagetes minuta正在越来越多地入侵西藏东南部,沿着Yarlung Zangbo河.
- 了解T. minuta入侵的生态影响对于管理高原生态系统中的入侵物种至关重要.
研究的目的:
- 分析西藏东南部T. minuta侵袭植物群落的物种组成和多样性.
- 调查T. minuta入侵,海拔梯度和息地类型之间的关系.
- 为高原地区的入侵植物生态管理提供数据.
主要方法:
- 进行了实地调查,并在T. minuta侵袭的地区在2,925至3,553米的海拔上确定了31个象限.
- 系统地分析了物种组成,多样性指数 (Shannon-Wiener,Simpson,Pielou的均性) 和物种丰富性.
- 检查了入侵特征 (高度,覆盖) 和高度/息地类型之间的相关性.
主要成果:
- 在被入侵的社区中记录了28个家族和69个属的78种植物物种; 星系植物 (Asteraceae),花系植物 (Poaceae) 和系植物 (Rosaceae) 主导.
- T. minuta的入侵显著增加了物种均性,但不是丰富性,在由Eragrotis pilosa和Plantago depressa主导的社区中多样性最高.
- 物种多样性与海拔高度没有显著的相关性,但T. minuta的高度与海拔高度有积极的相关性;在乱的息地,入侵更强.
结论:
- 在西东南部的Tagetes minuta入侵主要改变了物种分布的均性.
- 在这些被入侵的社区中,海拔不是物种多样性的关键驱动因素.
- 息地干扰显著影响T. minuta的高度,覆盖面和整体入侵潜力.
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