贵州典型土壤-辣椒系统中镉的迁移富集特征.

To screen pepper varieties of Cd low concentration to apply in the production, pot experiments were conducted to study the transport and enrichment characteristics of Cd in typical Guizhou soil-pepper system by setting different Cd concentration. Results:( i) After harvest of pepper, Cd content was 6.11%-11.84% lower in yellow soil than in calcareous soil. When Cd content ranged from 0mg/kg to5 mg/kg, increasing trends of Cd content of pepper root and overground part were 4.1 and 1.4 times faster under the planting condition of yellow soil than calcareous soil condition respectively.( ii) In yellow soil-pepper and calcareous soil-pepper system, Cd transfer coefficients were respectively 0.04-0.25 and 0.21-0.50 from pepper root to pepper fruit. And the transfer speed was 3 times faster under the planting condition of calcareous soil than yellow soil condition. In addition, Cd enrichment characteristics were respectively 0.93-1.65 and 1.02-3.04, and the characteristics were 1.84-1.10 times higher under the planting condition of calcareous soil than yellow soil condition. In short, the transfer speed and enrichment capacity of Cd from pepper root to pepper fruit in calcareous soil was quicker than in yellow soil. Moreover, the used pepper breed initially belong to the enrichment of Cd varieties. [ABSTRACT FROM AUTHOR]