冰缘苔藓植物生殖方式分析
时间:2023-08-30 22:27 来源:毕业论文 作者:毕业论文 点击:次
摘 要 本文以新疆天山一号冰川退缩迹地的苔藓植物为研究对象,通过对采集到的210余号苔藓标本的形态观察,进行种属鉴定。共记录苔藓植物16科31属59种(含种以下单位),其中苔类植物3科3属3种,藓类植物13科28属56种(含种以下单位)。对冰川退缩迹地苔藓植物的繁殖方式进行了统计后,发现只见有性繁殖(15种)占到25。42%,只见无性繁殖(34种)占到57。63%,两者皆见(10种)占到16。95%,说明在冰缘环境条件下无性繁殖依然是苔藓植物的主要繁殖方式。并发现了天山一号冰川退缩迹地生存的苔藓均为顶蒴藓类,支持了顶蒴藓类较为耐寒的结论。且在繁殖方式上雌雄异株(98。31%)远远高于雌雄同株(1。69%)和雌雄杂株(未找到)。89975 Abstract Morphological characteristics of 16 families, 31 genera and 59 species (including the following units) of bryophytes, including 3 families, 3 genera and 3 species of liverworts, 13 family, 28 genera and 56 species of mosses were studied based on 210 specimens collected from the bare land of Tianshan No。1 Glacier in Xinjiang。 Statistics analysis of reproductive strategy of bryophytes in peri-glacier environment were made and the results showed that only sexual reproduction is (16 species) accounted for 27。12%, and asexual reproduction (33 species) accounted for 55。93%, both only sexual reproduction and asexual reproduction (10 species) accounted for 16。95%。 The results indicated that asexual reproduction is still the main reproductive way of bryophytes in peri-glacier environment。 We found that the survival mosses in glacial retreat frontier are all acrocarpous mosses (100%) without pleurocarpous mosses, and the result supported the hypothesis that acrocarpous mosses are much old-resistant than pleurocarpous ones。 In the mode of reproduction, dioecious (96。1%) is much higher than monoecious (1。69%) and male and female mixed strains (not found)。 毕业论文关键词:天山一号冰川退缩迹地; 苔藓植物; 雌苞; 雄苞; 繁殖策略源Q于W优E尔A论S文R网wwW.yOueRw.com 原文+QQ75201,8766 Keyword: the bare land of No。1 glacier of Tianshan Mountains; bryophytes; Female bract; Male bract; Asexual reproduction 目 录 1 研究背景及意义 4 2 研究区概况 4 3 材料与方法 4 3。1 材料 4 3。2 标本鉴定 5 3。3 苔藓植物繁殖策略统计 5 4结果与分析 5 4。1 天山一号冰川退缩迹地苔藓植物多样性 5 4。1。1 天山一号冰川退缩迹地苔藓植物种类构成 5 4。1。2 天山一号冰川退缩迹地优势科的属种统计 6 4。2 天山一号冰川退缩迹地苔藓植物繁殖方式和繁殖策略统计 6 5 讨论 9 参考文献 11 致谢 12 1 研究背景及意义来自优Y尔L论W文Q网wWw.YouERw.com 加QQ7520~18766 “高山冰缘带”是指位于高山草甸和永久雪线之间的区域,被认为是陆地上最为极端的生境之一。植物的生长环境随着海拔的升高变得越来越恶劣,高山植物的生长、繁殖与分布受到低温等众多环境因子的影响。冰川退缩后出现的裸地会开始进行一系列的生物群落演替[1-3],这期间微生物提供了最早的群落,之后地衣[4]、苔藓[5-6] 等先锋植物再出现,形成生物土壤结皮,最后是草本和乔木的出现[7-8]。 (责任编辑:qin) |