重庆三峡水库消落带优势植物种群空间分布格局研究.doc

重庆三峡库区消落带优势植物种群空间分布格局研究 齐代华*, 贺丽，周旭，闵鹏 三峡库区生态环境教育部重点实验室重庆市三峡库区植物生态与资源重点实验室西南大学生命科学学院，重庆 北碚 400715重庆三峡消落带是中国乃至世界最为特殊的生态功能区，植物空间分布格局，对于合理利用消落带湿地生物多样性，生态系统，实现区域可持续发展起重要作用。(ID)，聚集度大小指数(ICS)，Green指数(GI)，聚集频度指数(ICF)，平均拥挤度指数(1MC)，聚块度指数(IP)，莫里西塔指数(IM)等7项指数，研究分析了重庆三峡库区消落带四个海拔区段的优势植物种群空间分布格局。结果表明：优势种群的分布格局皆属于聚集分布，但聚集强度有差异，这与物种的生物学特性有关。在每个海拔区段中，聚集强度最大的都是狗牙根种群，其他物种的分布规律不明显。在不同区段中，同一种群的聚集强度也存在差异，群落分布格局不仅受优势种的影响,还受环境因子制约。空间分布格局的各个指数是从不同的角度衡量某一种群的分布型，彼此指数之间存在一定的相关性。 Three Gorges Reservoir; water-level-fluctuating zone Analysis of spatial distribution pattern for dominant plant populations in the riparian of Three Gorges Reservoir Region, Chongqing QI Dai-hua, HE Li, ZHOU Xu, MIN Pen Key laboratory of Eco-environment in the Three Gorges Reservoir Region, Minisitry of Education, Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, Faculty of Life Sciences, Southwest University, Beibei 400715, Chongqing, China Abstract: Chongqing?Three?Gorges?Reservoir?is?the?most?special?ecological?function?zones?riparianin?China?and? the?world the?research?of?spatial?distribution?pattern?of?plants?in??this?area?plays??an?important?role?on?reasonably? use?of?reservoir?wetland?biodiversity,?maintaining?ecosystem?balance,?and??realizing?regional?sustainable?development. Based on the data from the field, dispersion(ID) index, cluster size(ICS) index, Green index(GI) index, cluster frequency(ICF) index, mean crowding(IMC) index, patchiness(IP) index and Moristial index (IM) were used to analyse the spatial distribution pattern of dominant plant population of four altitude sections in the riparian of Three Gorges Reservoir Region in Chongqing. Results showed that : the patterns of those dominant populations were all clumped, the biological characteristics of species was an important factor because there were significant difference in clump intensity. In each section, the largest aggregation intensity was rotundus populations, there were no obvious rule of