贵州岩溶地区土壤-红托竹荪(Dictyophora rubrovalvata)系统Cd迁移累积特征及其影响因素研究

doi:10.19741/j.issn.1673-4831.2021.0644

摘要/Abstract

摘要： 为探究岩溶区土壤-红托竹荪(Dictyophora rubrovalvata)系统中重金属Cd的迁移累积特征及其影响因素,采集了红托竹荪种植区土壤和红托竹荪样品,分析了土壤中Cd含量及其赋存形态、红托竹荪中Cd含量及富集特征,并采用主成分分析探讨了土壤中Cd迁移累积的影响因素。结果表明:红托竹荪种植区土壤总Cd含量为0.24~4.23 mg·kg^-1,平均值为0.96 mg·kg^-1,是GB 15618-2018《土壤环境质量农用地土壤风险管控标准(试行)》中农用地土壤污染风险筛选值的3.2倍,是贵州省土壤背景值的1.45倍。土壤Cd形态以可还原态为主,其含量占比为20.87%~63.81%,平均值为41.64%,Cd各形态占比为可还原态＞残渣态＞弱酸可溶态＞可氧化态。红托竹荪中Cd含量为0.07~0.39 mg·kg^-1(以鲜样计),平均值为0.18 mg·kg^-1,低于GB 2762-2017《食品安全国家标准食品中污染物限量》标准值(0.20 mg·kg^-1)。富集系数和转运系数分别为0.50~21.91和0.31~8.89。红托竹荪种植区土壤pH值与弱酸可溶态Cd含量呈显著负相关(r=-0.435,P＜0.05,n=26),与可还原态Cd含量(r=0.469,P＜0.05)、土壤总Cd含量(r=0.392,P＜0.05)呈显著正相关。红托竹荪中Cd含量(r=-0.670,P＜0.01)、Cd的富集系数(r=-0.724,P＜0.01)与土壤pH值呈极显著负相关关系。主成分分析表明,土壤pH值和K、Ca、Fe、Cu含量是红托竹荪富集Cd的主要影响因素。

关键词: 岩溶区, 红托竹荪, Cd, 迁移累积, 形态

Abstract: To explore the characteristics and influencing factors of the migration and accumulation of cadmium (Cd) in soil-Dictyophora rubrovalvata system in typical karst area, soil and Dictyophora rubrovalvata samples were collected. The contents of Cd and its occurrence forms in the soil, and the contents and bioaccumulation characteristics of Cd in Dictyophora rubrovalvata were analyzed, The factors affecting the migration and accumulation of Cd in the soil were discussed by principal component analysis. The results show that the total Cd contents of soil in the Dictyophora rubrovalvata planting area were between 0.24 and 4.23 mg·kg^-1 and the average content was 0.96 mg·kg^-1, which was 3.2 times that of the soil pollution risk screening value of agricultural land in GB 15618-2018 "Soil Environmental Quality Risk Control Standard for Soil Contamination of Agricultural Land (Trial)" and 1.45 times that of the soil background content value of Guizhou Province. The main form of Cd in soil was reducible (F2), and its relative content was 20.87%-63.81%, with an average value of 41.64%. The percentage contents of Cd in different forms were reducible state Cd (F2) > residual state Cd (F4) > weak acid soluble Cd (F1) > oxidable Cd (F3). The Cd contents of Dictyophora rubrovalvata ranged from 0.07 to 0.39 mg·kg^-1 and the average content was 0.18 mg·kg^-1 (in terms of fresh samples), lower than the standard value of GB 2762-2017 "National Standard for Food Safety:Limit of Pollutants in Food" (0.20 mg·kg^-1), and the bioconcentration factor and translocation factor were 0.50-21.91 and 0.31-8.89, respectively. The pH value showed a negative correlation with the weak acid soluble Cd (r=-0.435, P<0.05, n=26), the Cd in Dictyophora rubrovalvata (r=-0.670, P<0.01) and the Cd accumulation coefficient of Dictyophora rubrovalvata (r=-0.724, P<0.01), whereas showed a positive correlation with the reducible Cd (r=0.469, P<0.05) and the soil total Cd concentration (r=0.392, P<0.05). The principal component analysis indicate that pH value, K, Ca, Fe and Cu contents were the main impacting factors to the enrichment of Cd in Dictyophora rubrovalvata.

Key words: karst area, Dictyophora rubrovalvata, Cd, translocation and accumulation, occurrence form

中图分类号:

刘桂华, 王德美, 秦松, 柴冠群, 罗沐欣键, 范成五. 贵州岩溶地区土壤-红托竹荪(Dictyophora rubrovalvata)系统Cd迁移累积特征及其影响因素研究[J]. 生态与农村环境学报, 2023, 39(2): 236-243.

LIU Gui-hua, WANG De-mei, QIN Song, CHAI Guan-qun, LUOMU Xin-jian, FAN Cheng-wu. Study on Cd Migration and Accumulation Characteristics and Influencing Factors of Soil-Dictyophora rubrovalvata System in Typical Karst Area of Guizhou[J]. Journal of Ecology and Rural Environment, 2023, 39(2): 236-243.

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