城市滨河湿地植物群落调查

调查了绵阳市安昌江滨河湿地植物的群落类型及物种多样性,结果显示,滨河湿地植物有79种,分属36科,主要由草本构成,乔、灌、藤本植物较少.安昌江滨河湿地植物按优势种为代表可划分为空心莲子草、马唐、青蒿、马鞭草、构树、狗牙根等6个主要植物群落类型,以上6类群落类型对研究区域湿地生态系统的物质循环起着主要作用.研究区域内植物群落的垂直结构较简单,层次单一,在水平结构上表现出明显的镶嵌性,这可能与滨河湿地生境的多样化和破碎化有关.对整个滨河湿地群落不同层次的多样性指数（H＇）分析显示,草本层（3.97）＞乔木层（1.79）＞灌木层（1.61）;均匀度指数（E）为草本层（0.82）＞乔木层（0.79）＞灌木层（0.38）,灌木层分布不均匀.人类干扰引起的湿地环境的变化和旱生物种入侵是影响该区生物多样性的重要因素.

Investigation of Phytocenosis on Urban Riparian Wetland

Phytocenosis and species diversity of riparian wetland along Anchang River in Mianyang City were investigated and analyzed. The results showed that there were 79 species consisting of more herbs and less trees and shrubs along Anchang River riparian wetland, which belong to 36 divisions. The riparian wetland plants are mainly constructed by 6 plant communities including Ahernanthera philoxeroides, Digitaria sanguinalis. Artemisia carvifolia. HerbaVerbenae Officinalis, Broussonetia papyrfera, Cynodon dactylon, these plant communities are important to material circulation of Anchang River wetland ecosystem. The vertical structure of these plant communities are simple and single, while horizontal structure shows obvious tessellation, which may be relevant of the diversification and fragmentation of Anchang River riparian wetland. The analysis of different levels of diversity index （H） shows ： herb layer（3.97） 〉 the tree layer（1.79） 〉 the shrub layer（ 1.61 ） , and Evenness index （E） shows： herb layer（0.82） 〉 the tree layer（0.79） 〉 the shrub layer（0.38）. The species of herb layer and tree layer are uniformly distributed.