Cadmium uptake by garland chrysanthemum can be predicted from the cadmium in the soil solution, independent of soil type(Environment)
スポンサーリンク
概要
- 論文の詳細を見る
We conducted a pot trial to investigate the effects of soil cadmium (Cd) content, soil pH, soil type and soil chloride (Cl^-) content on Cd uptake by garland chrysanthemum (Chrysanthemum coronarium cv. Kiwame-Cyuba) to improve predictions of plant Cd uptake. We concluded that predictions of plant Cd uptake should involve the following two procedures: (i) predicting the Cd concentration of the soil solution as a function of the chemical properties of the soil, (ii) predicting plant Cd uptake as a function of the Cd concentration in the soil solution. A unique hyperbolic relationship was observed between plant Cd uptake and total Cd concentration in the soil solution. The relationship was independent of soil type, soil Cd content and salinity treatment, and was explained by: U_<Cd>=V_p[Cd_T]+{V_<max>[Cd_T]/K_m+[Cd_T]}, where U_<Cd> represents plant Cd uptake, [Cd_T] represents the total Cd concentration of the soil solution, and V_p, V_<max> and K_m are constants. The Cd adsorption kinetics were investigated using the "monodentate coordination model," which enabled Cd^<2+> activity in the soil solution to be explained by: log(Cd^<2+>)=logK_<mon>+logQ_<Cd> -pH-logC_<Cd>, where K_<mon> represents the equilibrium constant of Cd adsorption, (Cd^<2+>) represents Cd^<2+> activity, Q_<Cd> represents the amount of Cd adsorbed, and C_<Cd> represents the Cd adsorption capacity. The total Cd concentration in the soil solution showed a linear correlation with the Cl^- concentration in the soil solution. The effect of Cl^- salinity on the total Cd concentration in the soil solution was attributed to the formation of a cadmium-chloride complex (CdCl^+). For a more robust prediction of plant Cd uptake, there is a clear need for a simple method that can simultaneously determine the soil Cd concentration, the coefficient constant for Cd adsorption and the Cd adsorption capacity of the soil.
- 社団法人日本土壌肥料学会の論文
著者
-
Nakayama Megumi
Tochigi Prefectural Agricultural Experiment Station
-
KAMEWADA Kunihiko
Tochigi Prefectural Agricultural Experiment Station
-
Nakayama Megumi
Tochigi Prefectural Agricultural Experiment Station Tochigi Jpn
関連論文
- Cadmium uptake by garland chrysanthemum can be predicted from the cadmium in the soil solution, independent of soil type(Environment)
- Increase in Cation Adsorption Induced by Surface Complexation of Sulfate on Andisols and Prediction by "Four-Plane Model"
- Vertical distribution of denitrification activity in an Andisol upland field and its relationship with dissolved organic carbon : Effect of long-term organic matter application(Soil Chemistry)
- Application of "Four-Plane Model" to the Adsorption of K^+, NO_3^-, and SO_4^ from a Mixed Solution of KNO_3 and K_2SO_4 on Andisols