北京东灵山暖温带落叶阔叶林下草本物种多样性及其动态
Herbaceous plant diversity and its dynamic changes under a warm temperate deciduous broad-leaved forest in Donglingshan,Beijing
于涛 1朱丽 2魏岩 3祝燕2
作者信息
- 1. 新疆农业大学草业学院,乌鲁木齐 830052;中国科学院植物研究所植被与环境变化国家重点实验室,北京 100093
- 2. 中国科学院植物研究所植被与环境变化国家重点实验室,北京 100093
- 3. 新疆农业大学草业学院,乌鲁木齐 830052
- 折叠
摘要
提高对温带林下草本植物资源的认识,对物种多样性保护有重要意义.本研究调查了 2015-2018年东灵山落叶阔叶林20 hm2样地450个样方(1 m×1 m)内草本,对比4年内的草本层物种组成和数量特征,划分科与属的区系类型,分析物种多样性及结构的动态变化.结果发现:4年内草本层物种分别有62、55、57和 56 种,野青茅(Deyeuxia pyramidalis)、蒙古风毛菊(Saussurea mongolica)和大披针薹草(Carex lanceolata)优势种的地位没变;温带区系特征明显;年际间草本物种Patrick丰富度指数、Shannon指数、Simpson优势度指数和Pielou均匀度指数均具有显著差异;草本植物垂直方向分层显著,高度在10～20 cm范围的株数比例较大;物种数和个体数在样地中水平分布不均匀;各频度级物种数比例不稳定;草本植物以低多度级物种占多数,高多度级物种较少.
Abstract
Understanding herbaceous plant resources in temperate forests is of great significance for biodiversity conservation.We investigated herb diversity in 450 quadrats(1 m×1 m)in a 20-hm2 plot of warm temperate deci-duous broad-leaved forest in Donglingshan from 2015 to 2018,compared the species composition and quantitative characteristics of herbaceous layer across four years.We classified the floristic types based on families and genera,and analyzed the dynamics of species diversity and structure.There were 62,55,57,and 56 herbaceous species within the four years,respectively.The dominant species were Deyeuxia pyramidalis,Saussurea mongolica and Carex lanceolata,which remained unchanged within four years.The temperate floristic characteristics were obvious.The Patrick richness index,Shannon diversity index,Simpson dominance index and Pielou evenness index of her-baceous species were significantly different among the four years.The vertical stratification of herbaceous plants was obvious,with large proportion of plants in the range of 10-20 cm in height.The number of species and individuals were unevenly distributed horizontally in the plot.The proportion of species in each frequency level was unstable.The majority of herbaceous species were the low-abundance species,and the high-abundance species were few.
关键词
林下草本层/物种组成/区系特征/物种多样性Key words
understory herbaceous layer/species composition/floristic characteristics/species diversity引用本文复制引用
基金项目
植被与环境变化国家重点实验室项目(Y7206F1016)
国家自然科学基金(32271614)
国家自然科学基金(31870408)
中国科学院战略性先导科技专项(B类)(XDB31000000)
出版年
2024
国家科技期刊平台
NSTL
万方数据