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| Toxicity and Its Threshold of Cadmium to Tomato Roots in Different Soils |
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| KeyWord:cadmium; tomato roots; soil properties; toxicity threshold |
| Author Name | Affiliation | | YU Shu-juan | College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | GAO Shu-fang | College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | QU Ying-ming | College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | CHEN Yan-hui | College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | WANG Guo | College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China |
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| Abstract: |
| A pot experiment was conducted to study the toxic effects of different addition levels of Cd（0~16 mg·kg-1） on tomato roots and the soil properties affecting Cd toxicity thresholds at which tomato root length or biomass reduced by 20%（expressed as EC20） in 8 different soils. The effects of Cd on the length and biomass of tomato roots showed great differences among various soils. The thresholds for root length were between 0.26 mg·kg-1 and 11.61 mg·kg-1 of available soil Cd（0.1 mol·L-1 CaCl2-extractable Cd） and from 0.01 mg·kg-1 to 5.07 mg·kg-1 for root biomass. Soil pH was a key factor affecting the EC20 values for root length, which increased with soil pH. However, the EC20 for root biomass was primarily influenced by soil organic matter（ＳＯＭ） contents, with EC20 increased with soil SOM. |
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