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Related Experiment Video

Updated: Feb 8, 2026

Utilizing Soil Density Fractionation to Separate Distinct Soil Carbon Pools
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[Differences in Cd Accumulation in Typical Soils Under the Double Rice System].

Xin-Yang Li1, Jian Long1, Shu-Bing Wang2

  • 1College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China.

Huan Jing Ke Xue= Huanjing Kexue
|July 3, 2018
PubMed
Summary
This summary is machine-generated.

Cadmium (Cd) accumulation in rice differs significantly between yellow clayey and granitic sandy soils, with higher levels observed in clayey soils and during later growth stages. Soil Cd availability directly impacts rice Cd content, necessitating soil-specific environmental standards.

Keywords:
CdCd security threshold valuesaccumulation of Cddifferent types of paddy soildouble-rice system

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Soil Science

Background:

  • Cadmium (Cd) contamination in agricultural soils poses risks to crop safety and human health.
  • Understanding Cd uptake and accumulation in rice is crucial for managing food safety in contaminated areas.
  • Double-cropping rice systems present unique challenges for assessing heavy metal accumulation due to varying growth stages and soil conditions.

Purpose of the Study:

  • To investigate the differences in Cadmium (Cd) uptake and accumulation in double-cropping rice across distinct soil types.
  • To analyze the relationship between soil Cadmium availability (DTPA-Cd) and its accumulation in various rice tissues at different growth stages.
  • To establish critical soil Cd threshold values for different rice seasons and soil types to inform environmental quality standards.

Main Methods:

  • Pot experiments were conducted using yellow clayey and granitic sandy soils with varying exogenous Cd concentrations (0-10 mg·kg⁻¹).
  • Cd concentrations were measured in different rice tissues (roots, shoots, leaves, shells, brown rice) throughout the growth period.
  • Statistical analysis and prediction models were used to correlate soil Cd availability with rice Cd accumulation and determine critical threshold values.

Main Results:

  • Available Cd was significantly higher in yellow clayey soil compared to granitic sandy soil (P<0.01).
  • Rice Cd content increased with rising soil Cd levels and extended growth periods, with late rice accumulating more Cd than early rice.
  • Significant positive linear correlations were observed between soil DTPA-Cd and Cd content in rice tissues (roots, shoots, leaves, brown rice).

Conclusions:

  • Soil type and rice growth stage significantly influence Cadmium accumulation in rice.
  • Established critical Cd threshold values for rice in yellow clayey and granitic sandy soils are higher than national standards.
  • Soil security thresholds and environmental capacities vary greatly between soil parent materials, advocating for tailored Cd pollution control strategies and distinct environmental quality standards.