Mo, Hg, Cd, Cu, Zn are easy to transfer, their coefficients of absorption are usually higher than 1.0. Cr, Ni, Pb, As are hard to transfer,their coefficients of absorption are all mostly lower than 0.3. The contents of trace elements in herbaceous plants are affected by the species of the plant and the soil environment.
(4)The biological absorption coefficients of K,Zn and B by the plant s in limestone soil were higher than in acid soil,while those of other elements such as N,P,Ca,Mg,Fe,Al and Mn were just on the contrary.
The content of Al higher than those in acid soil, but the absorbencies of other elements (N, P, Ca, Mg, Fe, Al, Mn and Zn) were lower than those in acid soil.
Some indices such as 'contamination degree', 'geoaccumulation index', and 'biological absorption coefficient' were used to assess eco-environmental quality.
Zinc, W, Mo, Ni and Cr show the maximum biological absorption coefficient (BAC) ranging 0.4-1.7, 0.1-104.6, 1.1-2.6, 0.2-1.6 and 0.2-3.6, respectively, and the results suggest bioaccumulation of these elements in plants.
However, the BAC (biological absorption coefficient), which is the ratio of lead content in the plant to the lead content in the soil, a measure of relative accumulation, decreased by one to two orders of magnitude, except for grasses and snakeweed.
study on the features of the contents,distributions and accumulations of 11 chemical elements in soils and vegetations was carried out in each of the subalpine meadow zone ,the mountain five-flowered herbosa meadow zone and the evergreen coniferous forest meadow of the Mountain Meadow Natural Reserve in Mt . Wutai. It was found that the contents of chemical elements in the soils in each of these zones are within the ranges of their own na-tional averages in the same kind of soils, with both Co and Ni at...
In this paper, the biologically absorbing coefficients and the contents in plants of trace elements were investigated for 12 medicinal plant spedes in Hainan Province. The results show that the coefficient differed among families, among genus and among spedes. The difference decreased in the sequence of the elements: Mg>Al>Fe>Mn>Zn>Cu. The coefficient differed between spedes of the same genus, and between species of different habitats. The coefficient of Areca catechu in Halnan, for example, was greater tha...
The average contents of trace elements Zn, Cu, Mo, Pb, Cd, Cr, Ni, As and Hg in some herbaceous plants in Hainan province are tested to be 40.49, 8.39, 7.16, 2.47, 1.24, 1.50, 0.85, 0.71 and 0.07 mg/kg, respectively, so we can find that their orders are Zn>Cu>Mo>Pb>Cr>Cd>Ni>As>Hg. The contents of trace elements in Paspalum commersonii and Elephantopus scaber are high, while the contents in Schizachyrium sanguineum and Imperata cylindrica are usually low. Mo, Hg, Cd, Cu, Zn are easy to transfer, thei...