Elemental allelopathy by an arsenic hyperaccumulating fern,Pteris vittata L.
作者机构：Department of Biological SciencesNorthern Arizona University617 S.Beaver St.PO Box 5640FlagstaffAZ 86011USA Department of ChemistryMetropolitan State University of DenverPO Box 173362DenverCO 80217USA
出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)
年 卷 期：2018年第11卷第4期
页 面：553-559页
核心收录：
学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学]
基 金：Science Foundation of Arizona
主 题：Pteris vittata Chinese brake fern soil arsenic hyperaccumulation elemental allelopathy plant-plant competition physiological ecology
摘 要：Aims the functional advantages of arsenic(As)hyperaccumulation by plants are poorly *** proposed benefit,termed ele-mental allelopathy,occurs when hyperaccumulated As is cycled from the plant back into the top layer of soil,allowing As hyperaccu-mulators to gain an advantage over intolerant species by increasing soil As concentrations([As])underneath their *** date,there are no studies that detail the presence of increased soil[As]associ-ated with As *** this study,we documented vari-ation in the soil[As]associated with the Chinese brake fern,Pteris vittata *** also compared the effects of environmentally relevant soil and solution[As]on competitor plant *** Four populations of *** were identified in central Florida,*** tissue samples and soil samples were collected at the base of and at 3 m away from ferns in each population(n=36).Five sample locations were randomly selected from each site,and soils from the base and 3 m away from each fern were collected to examine the effects of naturally occurring soil[As]on the germination and growth of a potential competitor plant(Oxalis stricta).Solutions with increasing[As]were also used to examine the threshold for negative effects of[As]on *** growth.[As]were measured using inductively coupled plasma mass spectrometry(ICP-MS).Important Findings Overall,soil[As]from the base of ferns was nearly twice that of soil 3 m away indicating that ferns hyperaccumulate ***,ferns and their associated soil,contained different[As]depending on their col-lection site,indicating that these populations accumulate and use[As]*** growth decreased and germination was delayed as solution and soil[As]***,the relative distance from the fern that the soil was collected from did not affect growth,which would be expected with elemental *** results show that *** is associated with higher soil[As]and these concentrations are su
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