生态恢复对退化河岸植物群落的作用 ——以重庆九龙外滩河岸带生态恢复为例

河岸带是陆地生态系统与水生生态系统之间的过渡地带,受人类干扰的威胁较大.长江是流经重庆都市区的主要河流,主城区两江四岸部分河岸硬化,河岸生态功能退化或丧失,生物多样性降低.本文以重庆主城区九龙外滩的河岸带为研究区域,通过调查,采用Ward最小方差法对植物群落类型进行划分,比较了生态恢复区域和自然区域的植物群落特征及优势...

Effects of Ecological Restoration on Degraded Riparian Plant Communities:Take Jiulongwaitan in Chongqing as an Example

Riparian bank is the transitional zones between terrestrial and aquatic ecosystems.The Yangtze River,flowing through the urban area of Chongqing,has experienced serious river channelization,riparian hardening and other anthropogenic activities.These disturbances result in degradation of ecological function and reduction of biodiversity in riparian ecosystems.Elaborate attempts are underway to restore riparian ecosystems.The Ward’minimum variance method was used to classify plant community types through plot survey in the riparian of Jiulongwaitan in Chongqing.We analyzed the distribution pattern of dominant species along altitude and within plant communities in restored and natural riparian zones.The survey recorded a total of 72 vascular plant species from 60 genera and 23 families.Compositae and Gramineae were dominant families.The riparian zone was divided into 6 community types.The occurrence frequency of Form.Hemarthria altissima+Cynodon dactylon was the highest.Species richness,Shannon-Wiener diversity index and Pielou index were in the order of:restored area>natural area.These results indicated that practicable restoration measures could effectively reconstruct the plant communities and improve the plant diversity in the riparian zones.