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引用本文:高桂在,介冬梅,刘利丹,刘洪妍,高卓,李德晖,李楠楠.长春南湖芦苇(Phragmites australis)茎、叶植硅体随生长期和生境的变化特征.湖泊科学,2017,29(1):224-233. DOI:10.18307/2017.0124
GAO Guizai,JIE Dongmei,LIU Lidan,LIU Hongyan,GAO Zhuo,LI Dehui,LI Nannan.Response of phytoliths in Phragmites australis stem and leaf to different growth periods and humidity in Lake Nanhu, Changchun City. J. Lake Sci.2017,29(1):224-233. DOI:10.18307/2017.0124
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长春南湖芦苇(Phragmites australis)茎、叶植硅体随生长期和生境的变化特征
高桂在1,2,3, 介冬梅1,2,3, 刘利丹1,2,3, 刘洪妍1,2,3, 高卓1,2,3, 李德晖1,2,3, 李楠楠1,2,3
1.东北师范大学地理科学学院, 长春 130024;2.国家环境保护湿地生态与植被恢复重点实验室, 长春 130024;3.东北师范大学草地研究所植被生态科学教育部重点实验室, 长春 130024
摘要:
对于不同生长期、不同湿度条件下芦苇(Phragmites australis)茎、叶中多种类型植硅体含量变化的探讨,能够为植硅体形成机理研究和探讨植硅体对气候变化的响应提供理论依据.选取长春市南湖为实验样点,于5-10月在3种不同生境(旱生、季节性水生和水生生境)采集芦苇样品,并分别统计芦苇茎、叶植硅体形态和数量.实验结果显示:首先,茎、叶植硅体组合特征存在明显差异,茎中帽型及个体较大的尖型等植硅体多于叶中,而叶中硅化气孔含量明显高于茎中.其次,随着植株的生长,芦苇茎中硅化气孔含量先增加后减少,鞍型植硅体含量变化较小而帽型植硅体含量先减少后增加,棒型植硅体含量逐渐增加、尖型植硅体含量先增加后减少;芦苇叶中硅化气孔含量持续增加,鞍型、帽型等短细胞植硅体含量下降,尖型、扇型等个体较大的植硅体含量逐渐增加.最后,不同植硅体类型的含量在3种生境中的变化情况较为复杂,茎中植硅体的数量变化没有明显规律,而芦苇叶中硅化气孔含量由旱生生境向水生生境逐渐增加,可见叶中硅化气孔含量的增加可以指示相对湿润的生境条件.总之,芦苇茎、叶内不同类型植硅体的数量对植株生长及不同湿度环境有不同程度的响应,对芦苇植硅体的研究也有助于理解湿生植物植硅体与环境因子的关系,进而为探讨植硅体对古环境、古气候的响应提供理论基础.
关键词:  芦苇  植硅体  生长期  湿度  长春南湖
DOI:10.18307/2017.0124
分类号:
基金项目:环保行业公益项目(201109067)和国家自然科学基金项目(41471164,40971116)联合资助.
Response of phytoliths in Phragmites australis stem and leaf to different growth periods and humidity in Lake Nanhu, Changchun City
GAO Guizai1,2,3, JIE Dongmei1,2,3, LIU Lidan1,2,3, LIU Hongyan1,2,3, GAO Zhuo1,2,3, LI Dehui1,2,3, LI Nannan1,2,3
1.School of Geographical Science, Northeast Normal University, Changchun 130024, P. R. China;2.State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Changchun 130024, P. R. China;3.Institute of Grassland Science, Northeast Normal University, Key Laboratory for Vegetation Ecology, Ministry of Education, Changchun 130024, P. R. China
Abstract:
The research on phytoliths of Phragmites australis in different growth periods and under different humidity, can provide theoretical basis for the reconstruction of paleovegetation and paleoclimate. Eighteen P. australis samples were selected in Lake Nanhu in Changchun City from May to October and along the humidity gradient of aquatic, seasonal waterlogged and mesic habitats. We then extracted and compared the P. Australis phytoliths of stems and leaves from different growth periods and different habitats. First of all, phytolith assemblages in stems and leaves were different markedly. For example, the contents of rondel and some other phytolith (bulliform, lanceolate and elongate) in stems were higher than those in leaves, while the contents of the silicified stomata in stems were significantly lower than those in leaves. Secondly, the phytolith assemblages in leaves and stems differed. The contents of silicified stomata and some large phytoliths in leaves increased, while contents of saddle and rondel in leaves reduced with the growth of P. australis. In contrast, contents of silicified stomata and lanceolate in stems increased firstly and then decreased, while contents of rondel decreased firstly and then increased. In addition, with the growth of plants, the content of elongate increased steadily, while the content of saddle unchanged. Finally, the contents of phytoliths differed under different habitats. For example, the contents of silicified stomata in leaves increased gradually from mesic to aquatic habitats, suggesting that silicified stomata may indicate the humid environment.
Key words:  Phragmites australis  phytolith  growth period  humidity  Lake Nanhu of Changchun City
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