广西植物Issue(6)：817-824,8.DOI:10.11931/guihaia.gxzw201408025
人为干扰下雅安市雨城区青衣江河岸带草本植物群落物种多样性及生态位的研究
Effects of human disturbance on species diversity and niche of herbaceous plants along Qiyijiang riparian zone in Ya’an City,Sichuan Province
摘要
Abstract
In order to make a thorough inquiry in effects of human disturbance on herbaceous plant community,an inves-tigation has been conducted along Qingyijiang River riparian zone,Ya’an City,Sichuan Province by using the typical sam-pling method.The species Richness index D ,Shannon-Wienner index H ,Simpson index H′and Pielou index J sw were a-dopted to make evaluations on the level of species diversity on herbaceous plant community.There are three kinds of sample areas under human disturbances of three different intensities in the investigated zone:flood lands under slight dis-turbance,mow grasslands under medium disturbance,and abandoned farmlands under severe disturbance.The results showed that sixty-four plant species that belong to 26 families and 53 genera were found in the three kinds of studied are-as.Species richness significantly decreased with the increment of disturbance intensity.By analyzing the important val-ues,it was discovered that under disturbances of all levels of intensities,the main bodies of the communities are composed of the species which belong to Compositae,Gramineae,Leguminosae,Polygonaceae and Umbelliferae.However,there was no obvious main edificatory in the communities under disturbances of different levels of intensities,since the impor-tant values of each species has no significant difference,indicating the intenses of interspecific competitions.The results indicated that the numbers of the species with niche overlap values above 0.5 in communities under light disturbances, medium disturbances and severe disturbances respectively accounted for 95.0%,85.4% and 74.2% of the total species numbers.Sørensen’s similarity coefficient (S S )between communities under disturbances of different levels of intensities were different.Sørensen’s similarity coefficient (S S )between communities under slight and medium disturbances,medi-um and severe disturbances,and slight and severe disturbances were 0.733,0.719 and 0.625,respectively.Species richness index D and Shannon-Wiener index H decreased with the increment of the human disturbance intensity,the sequences of them were slight disturbance>medium disturbance>severe disturbance,and the difference among disturbance intensities were significant.However,there was no significant differences of Simpson index H′ and Pielou index J sw among sample areas.关键词
人为干扰/物种多样性/生态位/河滩地/割草地/弃耕地Key words
human disturbance/species diversity/niche/floodplain/moving grassland/abandoned farmland分类
农业科技引用本文复制引用
郝建锋,王德艺,李艳,姚小兰,张逸博,朱云航,齐锦秋..人为干扰下雅安市雨城区青衣江河岸带草本植物群落物种多样性及生态位的研究[J].广西植物,2015,(6):817-824,8.基金项目
国家自然科学基金(31370628) （31370628）
国家“十二五”科技支撑计划项目(2011BAC09B05) （2011BAC09B05）
四川农业大学双支计划博士专项(00370401)。 （00370401）
