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

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