文献类型：期刊文献

中文题名：湛江沿海盐渍田土壤-稻米系统重金属含量与土壤酶活性的特征及其相关分析

英文题名：Characteristics and Correlation Analysis of Heavy Metal Content and Soil Enzyme Activity in Soil-Rice System of Zhanjiang Coastal Salinized Farmland

作者：王盼盼[1];郭海峰[1];许江环[1];杨善[1];周鸿凯[1]

机构：[1]广东海洋大学滨海农业学院,广东湛江524088

年份：2021

卷号：30

期号：4

起止页码：857

中文期刊名：生态环境学报

外文期刊名：Ecology and Environmental Sciences

收录：CSTPCD、、CSCD2021_2022、北大核心、CSCD、北大核心2020

基金：广东省重点领域研发计划(2020B020219004);广东省高等教育创新强校工程(GDOU2017052604)。

语种：中文

中文关键词：盐渍田;耐盐水稻;重金属含量;土壤酶活性;相关性分析;回归分析

外文关键词：salinized farmland;salt-tolerant rice;heavy metal content;soil enzyme activity;correlation analysis;regression analysis

中文摘要：沿海盐渍田中耐盐水稻的种植可以有效利用土地资源,增加中国粮食总产量。探究湛江沿海盐渍田土壤-稻米重金属含量与土壤酶活性的特征及其相关关系,对评估湛江沿海盐渍田环境、农产品安全风险具有重大意义。以湛江5个区域沿海盐渍田种植耐盐水稻海红11的土壤-稻米系统为研究对象,采集了土壤样品及相应稻米,测定了脲酶、蔗糖酶、过氧化氢酶等3种土壤酶活性及土壤和稻米中Cd、Cr、Cu、Pb、Zn等5种重金属含量,采用单因子污染指数及内梅罗综合指数对重金属含量进行评价,对土壤、稻米重金属含量之间的关系作了生物富集系数与简单相关性分析,并对土壤重金属与酶活性进行了一元线性及非线性回归分析。结果表明,5个研究区域土壤及其稻米的5种重金属含量均未超过国家标准,但与1996年雷州半岛砖红壤背景值比较,研究区域盐渍田土壤存在着重金属富集的趋势,受人为活动影响较大,其中Cd的单因子污染指数最高,那么其为影响研究区土壤重金属污染的主要因子。研究区稻米重金属含量均未超过限量值,5种重金属富集能力大小的顺序为Zn>Cd>Cu>Cr=Pb。土壤与稻米重金属含量的相关性分析结果表明,土壤、稻米中重金属含量关系紧密,土壤中重金属含量直接影响稻米重金属含量。通过土壤重金属与酶活性的回归分析统计发现,过氧化氢酶活性与土壤Cu、Zn含量达到显著性负相关,脲酶活性与土壤Cu含量之间的回归关系也均达到了极显著负相关水平,因此,在湛江沿海盐渍田中,将过氧化氢酶作为评估Cu、Zn污染程度,脲酶作为评估Cu污染程度的生化指标是可行的。这些结果可为沿海盐渍田的修复、环境与农产品安全风险管控提供科学依据。

外文摘要：The planting of salt-tolerant rice in coastal salinized fields can effectively utilize land resources and increase the total grain yield in China.Therefore,it is great significance to explore characteristics and relationship between soil-rice heavy metal content and soil enzyme activity in coastal salinized farmland in Zhanjiang,and to evaluate the environment and agricultural product safety risks in coastal salinized farmland in Zhanjiang.The soil-rice system of salt-tolerant rice Haihong 11 planted in coastal salinized farmland of five regions in Zhanjiang was used as the research object in this study.The samples of soil and corresponding rice were collected,and the activities of three soil enzymes(urease,sucrase,catalase)and the five heavy metals(Cd,Cr,Cu,Pb,Zn)contents of soil and rice were determined.The heavy metal contents were evaluated by single factor pollution index and Nemero composite index.The relationship between heavy metals content of soil and rice was analyzed using bioenrichment coefficient and simple correlation,and the relationship between heavy metals content and enzyme activity in soil was analyzed using unary linear and nonlinear regression analysis.The results showed that five rice or soil heavy metal content of five research areas did not exceed national standards.However,compared with laterite background values of Leizhou peninsula in 1996,there was a tendency of heavy metal enrichment in salinized farmland soil in the study area,of which single factor pollution index of Cd was the maximum.Then,Cd was the main factor affecting the soil heavy metal pollution in the study area.The contents of heavy metals in rice in the study area did not exceed the limit value,and the order of enrichment ability of the five heavy metals was Zn>Cd>Cu>Cr=Pb.Correlation analysis of heavy metal content between soil and rice showed that there was a close relationship between the heavy metal content in soil and rice,and the heavy metal content in soil directly affected the heavy metal content in rice.According to the regression analysis of soil heavy metals and enzyme activities,catalase had a significant negative correlation with Cu and Zn content of soil,and the regression relationship between urease and Cu content of soil reached a highly significant negative correlation level.Therefore,it is feasible to use catalase as a biochemical index to evaluate the pollution degree of Cu and Zn and urease as a biochemical index to evaluate the pollution degree of Cu in the coastal salinized farmland of Zhanjiang.These results provide a scientific basis for the restoration of coastal salinized farmland,environmental and agricultural product safety risk control.