黑龙江呼中自然保护区高山珊瑚枝假果柄不同部位的元素组成  

Element Compositions in Different Parts of Pseudopodetia of Stereocaulon alpinum from Huzhong Natural Reserve,Heilongjiang, China

作　　者：吴园园[1] 高静 赵润康 陈庆芝 柳燕云 张佳林 刘晓迪[1] 康志娟 刘爱琴 刘华杰[1] WU Yuan-yuan;GAO Jing;ZHAO Run-kang;CHEN Qing-zhi;LIU Yan-yun;ZHANG Jia-lin;LIU Xiao-di;KANG Zhi-juan;LIU Ai-qin;LIU Hua-jie(College of Life Sciences,Hebei University,Baoding 071002,Hebei,China;Hebei Research Center for Geoanalysis,Baoding 071051,Hebei,China)

机构地区：[1]河北大学生命科学学院,河北保定071002 [2]河北省地质实验测试中心,河北保定071051

出　　处：《生命科学研究》2020年第1期39-46,共8页Life Science Research

基　　金：国家重点研究发展计划资助项目(2016YFC0500700);国家自然科学基金资助项目(31000239);河北省自然科学基金资助项目(C2014201032,C2010000268)

摘　　要：地衣元素组成是监测大气元素沉降的有效和可靠指标,其受地衣年龄的影响较大,但该影响在土生枝状地衣中的研究并不充分。本研究测定了采自黑龙江大兴安岭呼中自然保护区的枝状地衣高山珊瑚枝(Stere原ocaulon alpinum)中55种化学元素(Ag、Al、As、B、Ba、Be、Bi、Ca、Cd、Ce、Co、Cr、Cs、Cu、Dy、Er、Eu、Fe、Gd、Ge、Hg、Ho、K、La、Li、Lu、Mg、Mn、Mo、Na、Nb、Nd、Ni、P、Pb、Pr、Rb、S、Sb、Sc、Se、Si、Sm、Sn、Sr、Tb、Th、Ti、Tl、Tm、U、V、Y、Yb和Zn)的含量,并比较了其在假果柄不同部位(顶部、中部和基部)的差异,以检测无污染生境中地衣体部位与元素种类对地衣体内元素积累量的影响。结果显示:地衣元素含量与已有研究中地衣元素含量的背景值/基线值范围相符,表明研究区域内大气元素沉降程度极低;绝大多数生理代谢意义甚小的元素在年老部位含量较高,表明这些元素在地衣体内随地衣年龄增长而持续积累,且在地衣体内的转运强度较低;部分营养元素垂直趋势不明显,或在中部最低,反映了地衣体内营养元素向生长旺盛的顶端转运的趋势。因此,在以地衣元素组成为测试指标的大气污染监测中,需针对拟研究的元素,选取地衣的特定部位,并在不同研究的数据比较中使用相同部位,以增加数据的可比性。Lichen element compositions are a reliable and effective tool for biomonitoring atmospheric element deposition.The lichen age effect is one of the important factors influencing lichen element concentrations.However,this effect is not fully understood for terricolous fruticose lichens.Herein,samples of a fruticose lichen Stereocaulon alpinum from a remote site of Huzhong Natural Reserve,Greater Khingan Mountains of Heilongjiang Province were collected.Fifty-five elements(Ag,Al,As,B,Ba,Be,Bi,Ca,Cd,Ce,Co,Cr,Cs,Cu,Dy,Er,Eu,Fe,Gd,Ge,Hg,Ho,K,La,Li,Lu,Mg,Mn,Mo,Na,Nb,Nd,Ni,P,Pb,Pr,Rb,S,Sb,Sc,Se,Si,Sm,Sn,Sr,Tb,Th,Ti,Tl,Tm,U,V,Y,Yb,and Zn)were measured and their differences among 3 parts(apical,middle,and base parts)of the pseudopodetia were compared in order to examine the effect of different parts of lichen and elements on lichen element accumulations in the uncontaminated ecological environment.The results showed that concentrations of all elements were in the range of the reported background/baseline values,suggesting a low degree of atmospheric element deposition in the study site.Concentrations of most elements with limited metabolic significance were generally the highest at base part,suggesting a continuous bioaccumulation and a low degree of translocation in the lichen thalli.Concentrations of some nutrients showed little differences among the different parts,or were higher in the apical part than in the middle part.These results suggest a nutrient translocation from the older parts to the younger parts of pseudopodetia.Therefore,in lichen biomonitoring studies,specific parts of lichen should be taken into account based on the interested elements,and to ensure the comparability of data among different surveys,the same parts of the thallus should be selected.

关 键 词：珊瑚枝属 元素含量 生物监测 大气沉降 枝状地衣 

分 类 号：Q948.119[生物学—植物学] X835[环境科学与工程—环境工程]