若尔盖高原退化沼泽群落植物多样性及种间相关性沿排水梯度的变化  

Changes of plant species diversity and interspecific correlation in a degraded swamp community along drainage gradients on the Zoigê Plateau of China

作　　者：韩大勇[1] 杨永兴[1] 杨杨[2] 

机构地区：[1]同济大学环境科学与工程学院长江水环境教育部重点实验室,污染控制与资源化研究国家重点实验室,上海200092 [2]同济大学生命科学与技术学院,上海200092

出　　处：《植物生态学报》2012年第5期411-419,共9页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金(41171074、40771013、U0933601和40971285);2004年上海市科学技术委员会重大攻关项目(04DZ19302)资助

摘　　要：植物多样性与种间相关性是植物群落生态学和生物多样性研究的核心问题,然而有关二者之间关系的综合研究尚不多见。该文以若尔盖高原排水干扰下不同退化阶段的沼泽湿地植被为研究对象,应用Spearman秩相关、回归分析等方法,分析了沼泽植物群落物种多样性和种间相关性的变化及二者相互关系。结果表明:沿排水梯度,从相对原生沼泽至极度退化沼泽,不同植物种群均有其特定的生态分布范围;群落总种数、样方物种丰富度、Shannon-Wiener指数和Whittaker指数均单调增加;植物种间相关强度增加;正相关种对比例呈逐渐增加的趋势,以极重度和极度退化阶段的较高,相对原生沼泽和轻度退化阶段的较低,负相关种对比例的变化趋势与之相反;Shannon-Wiener指数与正负相关种对比例均具有显著线性关系(p<0.05),Whittaker指数均无显著关系(p>0.05)。人为排水作用通过提高群落生境异质性,促进正相关种对的共存,增加沼泽群落植物多样性。Aims Plant species diversity and interspecific correlation are central topics in phytocoenology and biodiversity science.Our objective is to study the dynamics and interrelationships of plant species diversity and interspecific correlation in a Zoigê Plateau swamp community at different stages of degradation caused by anthropogenic drainage.Methods Spearman＇s rank correlation and regression analysis were employed to analyze plant species diversity and interspecific correlation as well as their relationship.Important findings Along drainage gradients from relatively pristine swamp to extremely degraded swamp,different plant species had restricted ecological distributions.The total number of species,species richness per quadrat,Shannon-Wiener index and Whittaker index all increased monotonically,and the intensity of interspecific correlation increased in general.The proportion of species pairs with positive correlation increased gradually with increasing level of degradation.The proportion of species pairs with negative correlation showed an opposite trend.Shannon-Wiener index showed significant linear correlation with the proportion of species pairs with positive or negative correlation（p〈 0.05）,but Whittaker index showed no significant correlation（p 〈0.05）.The positive interspecific correlation and plant species diversity of the swamp community were promoted by habitat heterogeneity caused by anthropogenic drainage.

关 键 词：种间相关性 Spearman秩相关 物种多样性 沼泽植被退化 若尔盖高原 

分 类 号：Q948[生物学—植物学]