不同氮磷钾肥对海泡石钝化修复镉污染土壤的稳定性研究

doi:10.11934/j.issn.1673-4831.2018.06.010

Abstract

Abstract:

A two-year pot experiment was conducted to investigate effects of application of urea, NH₄HCO₃, SSP, CMP, KCl or K₂SO4, (six common types of fertilizer) on Cd immobilization in remediation of Cd polluted soil with sepiolite. Results show that Cd concentration in brown rice decreased by 41.4% in the first year and 32.7% in the second. The application of NH₄HCO₃ and CMP decreased the Cd concentration in brown rice by 28.4% and 26.9% in the first year and by 2.1% and 11.4% in the second, respectively, while the pa of SSP and KCl increased the Cd concentration in brown rice in both years by 31.6% and 39.3%, and by 9.24% and 53.8%, respectively. The application of Urea decreased the Cd concentration in brown rice by 49.93% in the first year, but increased it by 23.51% in the second. The application of K₂SO₄ increased the Cd concentration in brown rice by 36.57% in the first year, but decreased it by 3.29% in the second. Besides, the effect of sepiolite immobilizing Cd was much higher in the first year than in the second, but was still good in the second in remedying the polluted soil. However, its effect was affected by application of fertilizers. In the first year its Cd immobilization coefficient dropped the least in the treatment of CMP and the most in the treatment of KCl, while in the second year, it dropped by 4.54% and 10.2%, respectively, in the treatment of urea and NH₄HCO₃. Nonetheless, CMP, SSP, KCl and K₂SO₄ all increased the Cd immobilization coefficient to a varying extent. Considering the effects of different fertilizers on Cd concentration in brown rice and sepiolite immobilization of Cd, it is highly recommended to use NH₄HCO₃, CMP and K₂SO₄ in the process of remedying Cd contaminated soil with sepiolite.

Key words: nitrogen, phosphate, potassium, sepiolite, cadmium, immobilization

CLC Number:

X53
Q948

HUANG Rong, XU Ying-ming, HUANG Qing-qing, XIE Zhong-lei, YIN Xiu-ling, QIN Xu. Effects of Nitrogen, Phosphate and Potassium Fertilizer on In-situ Remediation of Cd Polluted Paddy Soil With Sepiolete[J]. Journal of Ecology and Rural Environment, 2018, 34(6): 547-553.

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Effects of Nitrogen, Phosphate and Potassium Fertilizer on In-situ Remediation of Cd Polluted Paddy Soil With Sepiolete

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