The study of plant community character in Alice Lake Wetland

Abstract

艾里克湖是克拉玛依唯一的天然湖泊,近年来由于人口增加和过量地开发利用水土和生物资源,致使湖泊面积不断减小,动植物种类减少,加剧了荒漠化的发展,导致区域环境恶化。本文应用双向指示种分类法(TWINSPAN)和典范对应分析法(CCA),对艾里克湖湿地及其周边植物群落与环境因子的关系进行了研究,确定了影响该研究区域植被分布主要环境因子是地下水位埋深和土壤有机质的含量,结果表明,该研究区域主要植被类型中共有植物18种,隶属10科,17个属。其中,多数植物种类在样方中出现的频次较低,说明该地区植物物种丰富度较低。TWINSPAN结果表明,该地区植物可以分9个种类组,与实际调查结果一致。同时对艾里克湖湿地植物群落特征指数与土壤环境因子的关系进行研究,结果表明,研究区的主要植物分为4个种类组,其中胡杨、毛柽柳、芦苇和西伯利亚泡泡刺是最常见的种类。该区25个样地分为3个主要类型组,组1包括6个样地,组2包括18个样地,组3包括1个样地,分别代表不同土壤有机质、全氮、全磷含量的3种生境,阐明了有机质、全氮、全磷的含量对植被分布的影响。CCA排序结果同TWINSPAN分类结果基本一致,反映出植物群落分布格局随环境因子梯度变化的趋势。Alice Lake is the only crude lake in the Kelamayi area. Recently, the population increased and excessive exploitated water, soil and biology resources have caused duratively shink in the area of lake and the number of species plant and animal decreased. More and more argent problem lies ahead of us, that is the ecological enviroments of lakes become deteriorated and the trend of land desertification more severity.Quantitative classification (TWINSPAN) and ordination (CCA) methods were used to study the relationship between plant communities and environmental factors wetland and surrounding lands in the Alice Lake of arid land. The results showed that 18 plant species were identified, which belong to 17 genera in 10 families of this study, most of which have low occurrence frequency in quadrats. The 18 plant species could be also divided into 9 ecological species groups using TWINSPAN analysis. The distribution patterns of plant species were most strongly associated with ground water, soil organism.This ways were used to study the relationship between plant community character index and soil factors in the Alice Lake wetland too. The results showed that the major plant species in the study region were 4 ecological species groups, Populus euphratica, Tamarix hispida, Phragmites australis and Nitraria sibirica are the most common species in this study area. The analysis by TWINSPAN showed that 25 plots could be classified into 3 groups. Group 1 contains 6 sites, Group 2 contains 18 sites, and Group 3 contains 1 site. They express three habitats of different organic matter content, total nitrogen content, and total phosphorus content. CCA results were consistent with TWINSPAN results. The distribution patterns of plant species were most strongly associated with soil organism, total nitrogen, and total phosphorus. To a lesser extent, distribution of species was associated with soil pH value, conductivity and salinity. The major environment variables are soil organism, total nitrogen, and total phosphorus

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