闽江河口典型植被群落带及交错带植物-土壤体系中硅素的分布特征
Silica Distribution Characteristics in Plant-soil Systems of Typical Vegetation Communities and Ecotones in Min River Estuary Wetland
查看参考文献25篇
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文摘
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为研究闽江河口湿地典型植被群落带及交错带硅素空间分布特征,以鳝鱼滩湿地为研究对象,于2015年7月由陆向海方向设置2条样带,对植物生物硅含量及储量分配比、表层土壤生物硅及有效硅含量进行测定分析。结果表明:(1)闽江河口湿地典型植被群落带植物生物硅含量均低于交错带,且不同类型植物硅含量差异较大(p>0.05),其中芦苇、短叶江芏、互花米草和扁穗莎草硅含量分别为15.66,9.09, 7.17,7.77mg/g。从空间来看,高潮滩不同植物生物硅含量均高于低潮滩。就不同器官而言,不同植物地上部分均高于地下部分,具体表现为枯体>茎>叶>根,其含量分别为13.40,12.49,11.72,6.58mg/g。(2)交错带植物(短叶茳芏与芦苇)地下根系生物硅分配比大于地上各器官,而典型群落带植物生物硅分配比则与之相反。(3)湿地表层土壤近岸方向2条样带生物硅含量变化趋势基本一致,近海方向2条样带则呈现相反的变化趋势;由岸及海方向2条样带表层土壤有效硅含量变化趋势基本一致。研究表明,植物的生态学特性及其生长环境条件不同、地形条件和潮汐作用带来水文条件的差异对湿地硅素的空间分布具有一定的影响,这对研究河口潮汐湿地硅素生物地球化学循环有重要意义。 |
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其他语种文摘
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The Shanyutan wetland was the largest tidal wetland in the Min River estuary,southeast China. Yet the related researches had been only carried on about porewaters and sediments while little was known about Si distribution in typical vegetation communities and its ecotones.Two transects from land to sea were laid in July 2015 to analyze the spatial distribution of Si in plant-soil systems in typical vegetation communities and ecotones.Results showed that the biogenic silica content in vegetation of ecotones was higher than the vegetation of typical communities while the spatial distribution of different vegetations had significant differences(p>0.05),and the contents in Phragmites australis,Cyperus malaccensis,Spartina alterniflora and Cyperus compressus were 15.66mg/g,9.09mg/g,7.17 mg/g and 7.77 mg/g,respectively.The different vegetation tissues in high tide beach contained more biogenic silica than those in low tide beach.The aboveground parts of vegetation,such as litter,stem and leaf with the contents of 13.40 mg/g,12.49mg/g and 11.72 mg/g,respectively,had more biogenic silica contents than underground roots(6.58mg/g).Contrary to typical vegetations community,the allocation proportions of biogenic silica in underground tissues were higher than those in aboveground tissues in ecotones(P.australis and C.malaccensis)of the Shanyutan wetland.Biogenic silica contents in surface soil between two transects showed the same trend in high tide beach and the opposite trend in low tide beach.And the available silicon contents in surface soil between two transects showed a same trend from land to sea.This study found that the differences of ecological characteristics of different vegetations and its growth conditions,and discrepancies of topographic and hydrological conditions caused by tide might affect the accumulation,absorption and spatial distribution of silicon in wetland, this would be of great significance for studying the biogeochemistry of Si in estuarine tidal wetland. |
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来源
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水土保持学报
,2017,31(1):279-285 【核心库】
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DOI
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10.13870/j.cnki.stbcxb.2017.01.046
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关键词
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硅
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交错带
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分布特征
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湿地
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闽江河口
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地址
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1.
福建师范大学, 湿润亚热带生态地理过程教育部重点实验室, 福州, 350007
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福建师范大学地理科学学院, 福州, 350007
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中国科学院水利部成都山地灾害与环境研究所, 中国科学院山地表生过程与生态调控重点实验室, 成都, 610041
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中国海洋大学化学化工学院, 山东, 青岛, 266100
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1009-2242 |
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学科
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环境科学基础理论 |
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基金
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国家自然科学基金项目
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福建省基金面上项目
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福建省公益类科研院所专项
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福建省“高等学校新世纪优秀人才计划”项目
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福建省“闽江学者奖励计划”项目
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大学生创新创业训练计划项目
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文献收藏号
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CSCD:5931041
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