毛乌素沙地火电厂周边不同类型生物结皮酶活性及其影响因素  

Enzyme activity characteristics and their influencing factors of different biocrusts around thermal plant in Mu Us Sandy Land

作　　者：王融融 樊瑾 丛士翔 余海龙[1] 黄菊莹[2] Rongrong Wang;Jin Fan;Shixiang Cong;Hailong Yu;Juying Huang(School of Geography and Planning/,Ningxia University,Yinchuan 750021,China;School of Ecology and Environment,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学,地理科学与规划学院,宁夏银川750021 [2]宁夏大学,生态环境学院,宁夏银川750021

出　　处：《中国沙漠》2023年第4期209-219,共11页Journal of Desert Research

基　　金：宁夏自然科学基金项目(2021AAC03007);国家自然科学基金项目(41961001)。

摘　　要：选取宁东能源化工基地典型火电厂周边广泛分布的3类生物结皮作为研究对象,探究工矿区生物结皮富集大气降尘重金属对酶活性的影响及其影响深度,在对比分析富集大气降尘过程中土壤理化性质、酶活性及重金属含量变化的基础上,采用相关分析、冗余分析方法探讨了生物结皮各层次土壤酶活性与土壤重金属含量和土壤理化性质之间的相关关系。结果表明:(1)沿藻结皮—混生结皮—藓结皮的演替方向,结皮层土壤有机碳(SOC)、全氮(TN)及全磷(TP)含量显著提升,土壤容重和pH降低;随土层深度增加,土壤理化性质变化不显著。(2)3类生物结皮对源自大气降尘的重金属元素均具有显著的表层富集作用,富集量藓结皮>混生结皮>藻结皮;结皮层重金属污染程度高于下层土壤。(3)4种土壤酶活性沿藻结皮—混生结皮—藓结皮的演替方向呈现一致的规律性,表现为藓结皮>混生结皮>藻结皮。(4)部分重金属元素Zn、Pb、Cd和土壤理化性质如容重、pH、SOC、TN等是影响土壤酶活性的主要因子,但相较于重金属元素,土壤理化性质对酶活性影响更大。To explore the heavy metals from atmospheric dust fall enriched by different biocrusts in mining area how influence the enzyme activities of biocrust and its subsoil,three types of biocrusts wide-spread area around typical thermal power station in Ningdong Energy Industrial Base were selected as study objects.Based on comparison analysis of the changes of soil physicochemical properties,and heavy metal contents during the process of the enrichment of atmospheric dust fall by biocrusts,the relationship between enzyme activities of biocrustal layer and subsoil and heavy metal contents,soil physicochemical properties were analyzed by using the methods of correlation analysis,redundancy analysis.The results indicated that:(1)Along with the succession direction of algal crust,mixed crust,and moss crust,the contents of soil organic carbon,total nitrogen,total phosphorus of biocrustal layers significantly increased,while bulk density and pH value decreased.(2)Biocrusts had significant surface enrichment effect on heavy metal elements derived from atmospheric dust fall,and demonstrated a consistent law among biocrusts of different types as followed Moss crust>Mixed crust>Algal crust.The geoaccumulation index evaluation results indicated that the heavy metal pollution level of biocrustal layers were higher than those of subsoils.(3)Along with the succession direction of algal crust,mixed crust,and moss crust,the activities of four kinds of enzymes exhibited a consistent order as followed Moss crust>Mixed crust>Algal crust.(4)Correlation and redundancy analysis indicated that heavy metals such as Zn,Pb,Cd and soil physicochemical properties such as soil organic matter,pH,bulk density,total nitrogen were the main factors that influencing the enzymatic activity of biocrusts.Compared with heavy metal pollution,soil physicochemical properties showed a bigger influence on soil enzyme activities.

关 键 词：生物结皮 酶活性 土壤养分 重金属 毛乌素沙地 

分 类 号：Q948.1[生物学—植物学]