| 新津河网系统河岸带植物种类组成与多样性研究 |
| Species Composition and Diversity of Riparian Vegetation in the River Network of Xinjin County, Chengdu |
| 投稿时间：2019-07-29 修订日期：2021-12-15 |
| DOI：10.15928/j.1674-3075.201907290189 |
| 中文关键词:河网系统 植物群落 多样性 新津县 |
| 英文关键词:river network plant community biodiversity Xinjin County |
| 基金项目:国家自然科学基金（41807321）；重庆市基础研究与前沿探索项目（cstc2018jcyjAX0672）；重庆市教委研究项目（KJQN201800530） |
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| 中文摘要: |
| 河岸带水-陆生态系统具有较高的生物多样性，是区域生物多样性保护和恢复的重要节点，选择成都市近郊的新津县为代表区域，沿其境内的西河、南河、羊马河、杨柳河、金马河及岷江河岸带设置15个样地，对其境内主要河网河岸带系统的植物组成、区系特点、群落类型及多样性特征进行调查分析。结果表明，新津县河岸带维管束植物共有64科、159属、212种，受生境异质性及人类活动干扰的影响，河岸带之间植物群落丰度及物种组成差异较大，尤其仅出现在某一条河流河岸带的物种达75种；从系统整体性看，由不同河流组成的河网河岸带系统能够支持更高的物种丰度，且湿生植物比例更大，对维持区域生物多样性更有价值；河岸带系统的植物区系成分复杂，以热带、温带及世界广布性成分为主，表明区域河网河岸带生境条件的复杂性；基于TWINSPAN分析将区域河岸带网植物群落分为12个优势类型，其中金马河段和羊马河群落类型有7~8个，西河、南河和杨柳河有3~4个，受人类活动干扰最强的岷江干流仅1个；金马河、西河河段植物的物种多样性指数较高，南河和羊马河次之，杨柳河和岷江段较低。不同河流之间群落相似性较低，对维持河网系统物种多样性具有重要意义。 |
| 英文摘要: |
| The riparian zones of rivers, acting both as corridors and buffer zones, provide important habitat for animals and plants and support high biodiversity. Compared to a single river, the biotopes of a river network are more complex, maintain higher biodiversity and provide a node for conserving and restoring regional biodiversity. In this investigation, the river network in Xinjin County of Chengdu City was selected as a case study. Vegetation community structure and biodiversity in the riparian zones were characterized, focusing on species composition, floral characteristics, community type and diversity. The aim was to provide a reference for the protection and rational utilization of river network riparian zones, and for conserving and enhancing biodiversity. The river network in Xinjin County is located in the middle reaches of Minjiang River, including the Jinma section and its primary tributaries, the Yangma, Yangliu, Nanhe and Xihe Rivers. Field investigation of the vegetation community was carried out in June of 2018, and a vegetation belt (30 m × 500 m) was set for each surveyed river and included 15 sample sites and 43 sample plots (1 m×1 m) in the five vegetation belts. Vegetation species, height and coverage were recorded, and community characteristics and distribution patterns were analyzed. A total of 212 species, belonging to 159 genera and 64 families, were recorded, with dominance by herbaceous plants, especially species of Compositae and Gramineae. Community abundance and species composition in the riparian zones presented significant differences because of habitat heterogeneity and human disturbance. Species composition in the riparian zones of the Yangma and Jinma Rivers were the most complex, and the number of plant species reached 75 in the riparian zone of only Yangma River, accounting for 35.4% of the total species. In terms of system integrity, the vegetation community of the river network system was more abundant and more complex than those for any single river, with higher species richness and a larger proportion of wetland plants. Due to habitat diversity, the floral composition of the river network was complex, including three primary categories: tropical, temperate, and cosmopolitan. Two way indicator species analysis (TWINSPAN) showed that there were 12 dominant vegetation community types in the study area: 7-8 along the Jinma and Yangma Rivers, 3-4 along the Xihe, Nanhe and Yangliu Rivers, and only one along the lower Minjiang River (the riparian zone most disturbed by human activities). Plant diversity was highest along the Jinma and Xihe Rivers, followed by the Nanhe and Yangma Rivers, and was lowest along the Yangliu and Minjiang Rivers. Vegetation community similarity among surveyed rivers was low and this finding is significant for conserving the biodiversity of this region. |
| 刘婷婷,王晓锋,袁兴中,龚小杰,侯春丽.2021.新津河网系统河岸带植物种类组成与多样性研究[J].水生态学杂志,42(6):24-33. |
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