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武夷山市5种类型茶园土壤重金属剖面分布特征

Vertical Distribution of Heavy Metalsin Five Types of Soils from Tea Plantations at Wuyishan

  • 摘要: 采用野外调查和室内分析相结合的方法,研究武夷山市5种类型茶园土壤(黄壤、红壤、潮砂土、高山草甸土、紫色土)重金属剖面分布特征。结果表明:茶园土壤Fe、Mn、Cu、Zn、Cd和Pb。不同类型茶园土壤重金属含量差异较大,茶园黄壤Fe和Cu含量显著高于其它土壤类型;潮砂土和高山草甸土茶园土壤Mn、Zn和Cd含量显著高于黄壤和红壤;茶园土壤Pb含量则以潮砂土最高,黄壤最低。不同重金属元素剖面分布规律略有不同,茶园土壤Fe含量0~80 cm深度内并无明显的变化规律;茶园土壤Mn、Cu和Zn含量在0~20 cm土层含量较高(潮砂土除外);黄壤、红壤和紫色土Cd和Pb含量由上至下呈递减的趋势,潮砂土Cd和Pb在40 cm以下土层含量较高。相关分析表明,除了Zn与Fe和Cu以外,其它重金属之间存在显著或极显著相关性,表现为多种重金属复合污染;土壤有机碳、全氮、pH、砂砾、粉粒和粘粒对茶园土壤重金属影响较大。的含量范围分别为17.35~44.91 g·kg-1、144.81~693.55 mg·kg-1、4.36~57.12 mg·kg-1、74.92~236.27mg·kg-1、0.09~0.67mg·kg-1和22.71~91.87mg·kg-1

     

    Abstract: From field surveys and laboratory analyses, the vertical distribution of heavy metalsin 5 types of soils(i.e., yellow, red earth, moist sandy,)of tea plantationsat Wuyishan City wasobtained. It was shown thatin the soils the contents of ferangedfrom 17.35g·kg-1to 44.91 g·kg-1, Mn from 144.81mg·kg-1 to 693.55 mg·kg-1, Cu from 4.36mg·kg-1to 57.12 mg·kg-1, Zn from 74.92mg·kg-1to 236.27 mg·kg-1, Cd from 0.09mg·kg-1 to 0.67 mg·kg-1, and Pb from22.71mg·kg-1 to 91.87 mg·kg-1.Disregardingthe variation on tillage, significant differences on heavy metalsexisted among the 5 soil types. Fe and Cuin the yellow soil were significantly higher than those in others. Mn, Zn and Cd in the moist sandy and the alpine meadow soils were significantly higher than those in either the yellowor thered earth soils. The alpine meadow soil contained the highest amount of Pb, and the yellow soil lowest,among all. The metal distribution in the soils varied by depth. For Fe, no significantdifference was found in the depth of 0 to 80 cmof the soils. For Mn, Cu and Zn, with the exception ofthe moist sandy type, the highest metal contents were observed inthe surface layer. In general, the contents ofCd and Pb(except Zn, Fe and Cu)indicating compounded pollutionat the plantations.In addition, it appeared that the organic matters, total N and pH, as well as the sand-, silt- and clay-type of the soilsaffected the heavy metaldistribution as well. decreased with the depth, butthe highest contents of these metals were located 40 cmbelow the surface ofthe moist sandy soil. There were significantorextremelysignificantcorrelationsamongtheheavymetals alpine meadow and purple soils

     

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