摘要
【目的】氮沉降已对全球生态系统产生影响,植硅体形态学特征变化能够反映植物对于环境变化的生理生态响应。北方泥炭地作为氮沉降敏感生态系统且存在着大量的富硅植物,研究北方泥炭地植物植硅体形态学有助于了解其生态系统如何响应日益加剧的氮沉降压力。【方法】研究在黑龙江省大兴安岭地区的泥炭地中采用完全随机试验设计,通过开展0,3,6,12 g N/(m^(2)·year)4个水平的氮添加试验,分析不同氮添加水平下5种北方泥炭地优势植物(柴桦(Betula fruticosa)、笃斯越桔(Vaccinium uliginosum)、小叶杜鹃(Rhododendron lapponicum)、狭叶杜香(Ledum palustre)、白毛羊胡子草(Eriophorum vaginatum))的植硅体含量及不同植硅体形态学组成特征。【结果】(1)除柴桦以外,随着氮添加水平的增加,其余4种植物叶片植硅体含量显著增加;(2)我国北方泥炭地优势物种的主要植硅体形态为:棒型、导管型、硅化气孔、尖型、扇型和球型。在不同的氮添加水平下,同种植物的植硅体种类基本没有变化,但随着氮添加水平的增加,各植物的植硅体形态构成存在差异;(3)氮添加水平对不同植物植硅体长度影响具有差异性,小叶杜鹃的棒型和导管型植硅体长度在高氮添加水平显著增加,笃斯越桔的棒型植硅体长度在高氮添加水平下显著高于其他处理。白毛羊胡子草的球型长度在高氮添加水平下显著低于其他处理。而狭叶杜香和柴桦各形态植硅体长度在不同氮添加水平下没有显著差异。【结论】不同氮添加对植硅体含量产生显著影响,反映了植硅体对我国北方泥炭地生态系统氮素增加下的响应;同时,植硅体形态组合特征随氮添加水平增加显著变化,体现了北方泥炭地优势植物在细胞水平上对氮素水平变化的响应。研究完善了植硅体形态学在北方泥炭地背景下对环境变化的研究应用,为进一步加深对陆�
[Objective]Nitrogen deposition has impacted ecosystems globally.Changes in the morphological characteristics of phytolith can reflect the physiological and ecological responses of plants to environmental changes.Since northern peatland ecosystem,with abundant silicon-rich plants,are sensitive to the nitrogen deposition,the study on morphology of phytoliths in northern peatlands may facilitate the understanding of how this ecosystem responds to the increasing nitrogen deposition pressures.[Method]A completely randomized trial design was adopted in the peat lands of Daxing‘an Mountains of Heilongjiang Province.By adding nitrogen at the levels of 0,3,6,12 g N/(m^(2)·year),the phytolith content and morphological composition of five dominant plants(Betula fruticosa,Vaccinium uliginosum,Rhododendron lapponicum,Ledum palustre,Eriophorum vaginatum)under different nitrogen addition levels were analyzed.[Result](1)Except Betula fruticosa,the phytolith content in the leaves of the other four plants increased significantly with the increasing nitrogen addition level.(2)The phytolith morphology of dominant species in the northern peatlands of China were mainly elongate phytolith,tracheids phytolith,stomatal complexes phytolith,lanceolate phytolith,flabellate phytolith and gircular phytolith.With different levels of nitrogen addition,the morphology of phytolith for the same plant had no significant change.However,with the increaseing level of nitrogen addition,the morphological composition of phytolith of each plant changed differently.(3)Nitrogen addition exerted different effects on the phytolith length among different plants.The length of elongate phytolith and tracheids phytolith of Rhododendron lapponicum increased significantly with high levels of nitrogen addition,and the length of elongate phytolith of Vaccinium uliginosum was significantly higher with high levels of nitrogen addition than that of other treatments.The gircularphytolith length of Eriophorum vaginatum decreased significantly with high levels of nitrog
作者
方淑侦
靳少非
王宇超
陈逸飞
林晨蕾
郑德祥
毛瑢
王宪伟
FANG Shuzhen;JIN Shaofei;WANG Yuchao;CHEN Yifei;LIN Chenlei;ZHENG Dexiang;MAO Rong;WANG Xianwei(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350007,China;Department of Geography,College of Oceanology,Minjiang University,Fuzhou 350108,China;College of Forestry,Jiangxi Agricultural University,Nanchang 330045,China;China Academy of Northeast institute of Geography and Agroecology,Changchun 130102,China)
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2022年第1期118-126,共9页
Acta Agriculturae Universitatis Jiangxiensis
基金
国家自然科学基金项目(32071760,41701099)。
关键词
植硅体
泥炭地
氮添加
大兴安岭
phytolith
peatland
nitrogen addition
Daxing’an Mountains
