不同改良剂在石灰性潮土上对土壤-小麦体系镉的吸收转运的影响

doi:10.16843/j.sswc.2021.04.011

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Abstract [Background] A certain area of high-yield farmland in North China has been seriously polluted due to the cadmium containing sewage irrigation for many years. Soil pollution degradation threatens grain production, and soil degradation caused by heavy metal pollution urgently needs to be rehabilitated. To find a material or compound formula that can be both low cost and remediation efficiency is very necessary for the remediation of heavy metal pollution in slightly alkaline soil in northern China. Compared with the total amount of heavy metals in soil, the bioavailability and form of heavy metals in soil have more influence on biotoxicity. Among the existing remediation technologies of heavy metal pollution in soil, the in-situ chemical fixation remediation technology can better satisfy the remediation and treatment of moderate and mild heavy metal pollution in terms of methods and time, and is especially suitable for the large-scale moderate and mild contaminated farmland in China. At present, there are no efficient, cheap and environmentally friendly remediation materials suitable for calcareous chao soils in the north of China.[Methods] In order to screen the stabilizing materials suitable for ecological restoration of degraded soil polluted by heavy metal Cd in calcareous chao soil, field and potted wheat experiments were carried out in a farmland polluted by heavy metal Cd in calcareous chao soil. The effects of single application of silicon-calcium-magnesium fertilizer (abbreviated to Si-Ca-Mg fertilizer), hydroxyapatite and chicken manure on soil pH, soil Cd bioavailability and Cd absorption, transport and enrichment in various organs of wheat plant during wheat maturity were studied.[Results] The contents of DTPA-Cd in soil and Cd in wheat organs decreased by different stabilizing agents. The contents of DTPA-Cd in soil and Cd in wheat grains decreased by 0.60%-73.66% and 8.03%-90.88%, respectively, compared with the control. Each stabilizing treatment changed the chemical form of Cd and reduced the activity of Cd in soil. Si-Ca-Mg fertilizer and hydroxyapatite significantly increased soil pH and reduced the activity and migration of Cd in the soil. Chicken manure reduced soil pH value, which was not conducive to soil Cd stabilization. Soil DTPA-Cd content was negatively correlated with soil pH value among all treatments, but positively correlated with Cd content in various organs of wheat plants, which all reached extremely significant levels.[Conclusions] Field and pot experiments showed that the Si-Ca-Mg fertilizer had better effect for Cd pollution remediation. However, considering the cost, remediation effect and the influence on farmland ecology, accurate application dosage and further quantitative research about Si-Ca-Mg fertilizer in slightly alkaline soil should be determined.

Key words： calcareous chao soil Si-Ca-Mg fertilizer hydroxyapatite chicken manure cadmium

Received: 03 February 2020

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	Articles by authors
	YANG Jinkang
	YANG Qiuyun
	ZHU Linan
	REN Shuaishuai
	ZHANG Jingjing
	HUA Dangling

Cite this article:

YANG Jinkang,YANG Qiuyun,ZHU Linan, et al. Effects of different amendments on the absorption and transport of Cd in soil-wheat system in calcareous chao soil[J]. SSWC, 2021, 19(4): 96-102.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2021.04.011 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2021/V19/I4/96

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