青藏高原湿地植物轻金属元素含量特征及其与环境因素的关系研究  

Concentrations of light metal elements in wetland plants and relationships with environmental factors in Qinghai-Tibet Plateau

作　　者：褚青帅 刘贵华[3] 邢伟[3] Chu Qing-Shuai;Liu Gui-Hua;Xing Wei(Research Center for Ecology and Environment of Qinghai-Tibetan Plateau, Tibet University, Lhasa 850000, China;College of Science, Tibet University, Lhasa 850000, China;Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China)

机构地区：[1]西藏大学青藏高原生态与环境研究中心,拉萨850000 [2]西藏大学理学院,拉萨850000 [3]中国科学院武汉植物园,中国科学院水生植物与流域生态重点实验室,武汉430074

出　　处：《植物科学学报》2021年第2期121-131,共11页Plant Science Journal

基　　金：国家自然科学基金项目(31870346,31971479);武汉市应用基础前沿项目(2020020601012287)。

摘　　要：以青藏高原湿地植物为研究对象,通过对青藏高原35个采样点的野外调查采样,对青藏高原湿地植物8种轻金属元素(Al、Mg、Ca、Sr、Ba、K、Na、Li)含量的特征及其与环境因素的关系进行分析。结果显示,不同湿地植物对不同轻金属元素的富集能力存在差异。轻金属元素在湿地植物体内的平均含量依次排序为:Li<Ba<Sr<Al<Mg<Na<Ca<K,且沉水植物的轻金属元素含量大于湿生植物和挺水植物。Pearson相关性分析结果表明,大多数植物体内轻金属元素含量之间呈显著正相关,且湿地植物与沉积物轻金属元素含量之间呈正相关,而与水体中轻金属元素含量呈负相关,表明沉积物是湿地植物体内轻金属元素的主要来源。Light metal elements play key roles in determining the growth and development of wetland plants.In this study,we measured the concentrations of eight light metal elements(Al,Mg,Ca,Sr,Ba,K,Na,and Li)in wetland plants of the Qinghai-Tibet Plateau through field investigation,and further elucidated their relationships with environmental factors.Results indicated that the wetland plants of the plateau exhibited significant differences in their accumulation of light metal elements.Among the 35 sampling sites,the plant concentrations of light metal elements varied greatly,with average concentrations in the order Li<Ba<Sr<Al<Mg<Na<Ca<K.Furthermore,the light metal element concentrations were higher in submerged plants than in hygrophyte and emergent plants.Pearson correlation analysis showed significant positive correlations among most light metal elements.In addition,most wetland plants showed positive correlations with light metal concentrations in sediment,but negative correlations with light metal concentrations in water.Thus,sediment appears to be the main source of light metal elements for wetland plants in the Qinghai-Tibet Plateau.Our results provide a theoretical basis for the maintenance of wetland ecosystem function and biodiversity conservation in the Qinghai-Tibet Plateau.

关 键 词：湿地 植物 轻金属 元素含量 青藏高原 

分 类 号：Q948[生物学—植物学]