首页|坡位对群落系统发育多样性的影响——以锡林郭勒典型草原为例

坡位对群落系统发育多样性的影响——以锡林郭勒典型草原为例

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
  • 维普
随着分子生物学技术在生态学中的广泛应用,基于物种亲缘关系探讨群落系统发育多样性及维持机制成为生态学研究的热点问题之一.为了揭示内蒙古典型草原不同坡位的群落系统发育多样性及群落构建的差异和驱动因素,选择在锡林郭勒典型草原开展研究,利用线上APGⅢ系统构建了该区域所有物种的系统发育进化树,并利用谱系多样性指数、净亲缘关系指数及最近亲缘关系指数,对不同坡位群落系统发育多样性和结构进行量化探究,同时采集了样地内的土壤并检测土壤养分、含水量、酸碱度及机械组成,分析它们对系统发育多样性的影响.结果表明:① 群落系统发育多样性随坡位的上升显著下降,主导因素是土壤机械组成中的粗粉粒含量.② 群落系统发育结构随着坡位的上升呈现出聚集程度增强的趋势,主导因素是土壤中速效磷含量.③整个坡位上的群落净亲缘关系指数均大于零,表明生境过滤是群落构建的主导因素.
Effect of Slope Position on Phylogenetic Diversity of Plant Community A Case Study in the Xilingol Typical Steppe
With the wide application of molecular biology technique in ecology, the study on phylogenetic diversity and maintenance mechanism of plant community has become as the research hotspots. In this study, a case study was carried out in the Xilingol typical steppe so as to reveal the phylogenetic diversity and difference of plant com-munity as well as the driving factors of community construction at different slope positions in a typical steppe in In-ner Mongolia.In our study, the phylogenetic tree of all species in the region was constructed based on the online APGⅢ system, and the phylogenetic diversity and structure of plant community at different slope positions were quantified by phylogenetic diversity index and net relatedness index. Moreover, the soil samples were collected, the soil nutrient content, water content, pH value and mechanical composition were detected, and their effects on the phylogenetic diversity were analyzed.The results are as follows:① The phylogenetic diversity of plant community was significantly decreased with the increase of slope position, and the coarse powder content was the dominant fac-tor in soil mechanical composition; ② The aggregation level of phylogenetic structure of plant community was in-creased with the increase of slope position, and the available phosphorus content in soil was the dominant factor; ③The net relationship index at all the slope positions was higher than zero, which indicated that the habitat filtering was the dominant factor of plant community construction.

phylogenetic diversityphylogenetic structureslope positionhabitat filteringtypical steppeXilingolInner Mongolia

金一兰、朱羚、燕亚媛、丁勇、张庆

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内蒙古大学生命科学学院,内蒙古 呼和浩特 010021

内蒙古大学生态与环境学院,内蒙古 呼和浩特 010021

中国农业科学院草原研究所/农业部草地生态与修复治理重点实验室,内蒙古 呼和浩特 010010

系统发育多样性 系统发育结构 坡位 生境过滤 典型草原 锡林郭勒 内蒙古

内蒙古自然科学基金面上项目内蒙古自治区高等学校创新团队发展计划项目中央级公益性科研院所基本科研业务费项目

2015MS0302NMGIRT13021610332015001

2018

10.13866/j.azr.2018.02.14

干旱区研究
中国科学院新疆生态与地理研究所 中国土壤学会

干旱区研究

CSTPCDCSCD北大核心
影响因子：1.157
ISSN：1001-4675
年,卷(期)：2018.35(2)
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