农业环境科学学报2025，Vol.44Issue(2)：330-341,12.DOI:10.11654/jaes.2024-0295
江苏太湖地区水稻全株Cd、Hg、Pb分布富集特征
Distribution of Cd,Hg and Pb in some whole rice plants and its accumulating features in the Taihu Lake areas,Jiangsu
摘要
Abstract
In order to effectively prevent and control heavy metals pollution in cultivated land,42 sets of the whole rice samples were collected and tested in the Taihu Lake areas in Jiangsu Province,and the systematic analyses and generation were conducted on these geochemical survey data newly obtained about Cd,Hg and Pb and other eco-environmental indicators within the soil and plants.By studying and generating their distribution characteristics and correlations between some geochemical indicators in soil and rice plants including roots,straws,stalks,leaves,shoots,chaffs and brown rice,and so on,and the distribution and enriched features have been explored or discussed in this paper related to Cd,Hg and Pb in those whole rice plants.The main studied results showed as follows:In the studied areas,there were significant differences in the distribution and enrichment of Cd,Hg and Pb,and the enriched ability of the brown rice was the relative weakest in the whole rice plants.As to Cd,Hg and Pb,the strongest ability to absorb heavy metals was Cd in rice,and the bioconcentratiton factors(BCF)of Cd were 35 times higher than Hg and 42 times higher than Pb in the whole rice plants.The distributive characteristics of Cd showed a significant unidirectional gradual decrease trend in the whole rice plants,from roots to straws,to stalks,to leaves,to shoots,to chaffs,and to brown rice,the mean values of Cd concentrations gradually decreased from 10.61 mg·kg-1 to 0.62 mg·kg-1,the mean value of their BCF decreased from 5.941 to 0.325,and there were the significant positive correlations between the Cd contents of each rice organ and other one in the whole rice plants,and the Cd enrichment in the brown rice was mainly controlled by some geochemical indicators in soil as to Cd,pH,TOC,etc.,or Cd in the brown rice may be from roots absorption mainly.The Hg distribution in the whole rice plants showed relative enrichment to leaves and roots,and the mean values of Hg concentrations from above stated every rice organs ranged from 0.004 4 mg·kg-1 to 0.027 6 mg·kg-1,and the mean values of their BCF ranged from 0.020 to 0.124,and the ranking orders of the Hg enriched degree were the brown rice<straws<chaffs<stalks<shoots<roots<leaves,and Hg in the brown rice was mainly controlled by TOC and Hg in soil,and uptake of leaves should be the most main sources of Hg in the brown rice.The distribution of Pb in the whole rice plant showed relative enrichment to roots and leaves,and the mean values of Pb concentrations of the all rice organs ranged from 0.10 mg·kg-1 to 8.25 mg·kg-1,and their mean values of BCF ranged from 0.002 to 0.178,and their Pb enriched degree ranking sequence were the brown rice<stalks≈straws<shoots≈chaffs<leaves<roots in the whole rice plants,and Pb concentrations of the brown rice were mainly controlled by Pb and TOC in soil,and the uptake of roots and leaves should be main Pb sources of the brown rice.Therefore,the main objectives should focus on the soil environments to prevent and control Cd pollution in rice in the studied areas,while preventing and controlling Hg and Pb pollution in rice should pay attention to both the soil and the atmospheric environments at same time.关键词
水稻全株/Cd/Hg/Pb/分布/富集特征/江苏太湖地区Key words
whole rice plant/Cd/Hg/Pb/distribution/accumulating features/Taihu Lake areas in Jiangsu Province分类
农业科学引用本文复制引用
李文博,廖启林,范健,黄顺生,任静华,崔晓丹,刘玮晶,徐宏婷..江苏太湖地区水稻全株Cd、Hg、Pb分布富集特征[J].农业环境科学学报,2025,44(2):330-341,12.基金项目
江苏省自然资源发展专项资金(海洋科技创新)项目(JSZRHYKJ202117) （海洋科技创新）
江苏省基础研究计划暨自然科学(面上)项目(BK20171496) Natural Resources Development Special Fund(Marine Science and Technology Innovation)Program of Jiangsu Province(JSZRHYKJ202117) （面上）
Natural Science Foundation of Jiangsu Province(General)(BK20171496) （General）
