›› 2017, Vol. 29 ›› Issue (3): 477-482.DOI: 10.3969/j.issn.1004-1524.2017.03.18

• Environmental Science • Previous Articles     Next Articles

Distribution of Ti forms in soils and its effect on growth of oil sunflower

XIA Huanhuan, DING Yanping, XIE Fangfang, LI Ling*   

  1. College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China
  • Received:2016-11-04 Online:2017-03-20 Published:2017-03-31

Abstract: The effects of different external concentrations of Ti on the distribution of Ti forms in soil and the oil sunflower growth as well as Ti uptake by oil sunflower were studied by using Tessier sequential extraction and pot culture experiments. The results showed that the distribution of Ti forms in soil decreased as residual>organic fraction>Fe-Mn oxide>exchangeable>carbonate fractions, and was mainly existed in residual state. With the increasing concentration of external Ti, there was a tendency of incrase in the contents of various Ti forms in soil and Ti content in each part of oil sunflower. The biological activity of Ti in soil was low, and biological availability coefficients and transfer coefficients were small. The enrichment factor and migration factor of Ti in oil sunflower were also small. High concentrations of external Ti inhibited the growth of oil sunflower. Oil sunflower had been poisoned with addition of 6 000 mg·kg-1 Ti. Dry mass of oil sunflower was negatively correlated with the contents of all forms of Ti and total Ti in soil. Carbonate-bound form played an important role in Ti contents of underground part of oil sunflower, and organic fraction contributed the most to the absorption of Ti by aboveground part of oil sunflower.

Key words: chemical forms, biological activity, oil sunflower, Tessier method

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