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南方铁杉更新能力一直受到关注,且争议较大。基于江西武夷山自然保护区内南方铁杉群落30块固定样地的群落调查数据,运用二元指示种分析(TWINSPAN)和去趋势典范对应分析(DCCA)对南方铁杉群落进行数量分类,并对其更新能力定量评价与影响因子分析。结果表明:南方铁杉固定样地中共有植物210种,隶属68科112属,依据物种的重要值划分为11个群落类型;海拔、坡位等空间要素与土壤厚度、养分等土壤因子对群落分布均有影响,但土壤因子比空间要素的影响力大,前者单独影响力为37.73%,后者为15.48%,二者偶合效应为7.65%;南方铁杉在乔木层、灌木层均以落叶树占优势的群落中更新能力最强,在乔木层以常绿树而灌木层以落叶树为优势的群落中次之,在乔木层、灌木层都是常绿树占优势的群落中更新能力最弱。研究表明本区南方铁杉可与较多物种共存,形成复杂多样的植物群落;南方铁杉自身具有较好的更新能力,群落结构与物种组成是影响其更新能力的主要因素,常绿、耐荫植物增多、竹类植物入侵将大大地抑制南方铁杉的更新。因此,保护与恢复南方铁杉种群的有效办法是群落结构调整、增加通透度、防止竹类植物入侵等。
South Hemlock regeneration capacity has been the subject of attention, and controversial. Based on the survey data of 30 fixed plots of southern hemlock community in Wuyishan Nature Reserve in Jiangxi Province, the quantitative analysis was carried out by using binary indicator species analysis (TWINSPAN) and descending trend model correspondence analysis (DCCA) Its ability to update quantitative evaluation and impact factor analysis. The results showed that there were 210 species belonging to 112 genera and 68 families in the fixed sample of Hemifuga fortunei. According to the important value of the species, they were divided into 11 communities. The spatial factors such as altitude and slope position, soil factors such as soil thickness, However, the influence of soil factors was greater than that of space elements. The former had a sole influence of 37.73% and the latter of 15.48%, and the coupling effect of the two was 7.65%. In the tree layer and shrub layer, Among the dominant communities, the regeneration capacity was the strongest, followed by the evergreen and shrub layer dominated by deciduous trees in the arbor layer, and the weakest in the tree layer and the shrub layer dominated by evergreen trees . Studies have shown that the southern hemlock can co-exist with more species to form a complex and diverse plant community. Southern hemlock itself has better renewable capacity, community structure and species composition is the main factor affecting its ability to update, evergreen, resistant Shade plants increased, bamboo invasion will greatly inhibit the regeneration of hemlock. Therefore, the effective ways to protect and restore the hemlock population are to adjust the community structure, increase the permeability and prevent the invasion of bamboo plants.