不同磷肥对水稻根表铁膜及砷镉吸收的影响——以石灰岩黄壤性水稻土为例

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Abstract To find effective measures for safe utilization of arsenic (As) and cadmium (Cd) co-contaminated paddy soils, the effects of six phosphate fertilizers on the availability of As and Cd in a limestone yellow loamy paddy soil, the amounts of iron plaque on root surface and the uptake of As and Cd by rice were investigated using a pot experiment. The results showed that the values of soil pH increased significantly in the treatments of hydroxyapatite (HAP), bioenzyme active phosphate fertilizer (BCP) and calcium magnesium phosphate fertilizer (CMP), while they decreased significantly in the treatments of calcium dihydrogen phosphate (MCP), potassium dihydrogen phosphate (MKP) and calcium superphosphate (SSP), as compared with that of control. The application of HAP, MCP and CMP significantly reduced the availability of soil iron while the other three phosphate fertilizers had slight influence on it. The effect of phosphate fertilizers on the availability of As and Cd varied with fertilizers. HAP significantly decreased the contents of soil available Cd and As, while MCP and BCP significantly increased the content of soil available Cd but had no significant effect on soil available As, and SSP decreased the content of available Cd but increased the content of available As significantly. The amount of iron plaque in the root surface was increased by 0.6% -27.1% due to phosphate fertilizer application and was positively correlated with Cd and As in it (R²=0.555** and R²=0.525*, respectively). MCP, MKP and BCP significantly decreased the content of Cd and As, while HAP, SSP and CMP significantly reduced the content of Cd, but had no significant effect on the content of As in brown rice. Application of all phosphate fertilizers decreased the transfer coefficient of Cd from leaf to glume, MKP and MCP inhibited the transportation of As from root to stem, while BCP suppressed the transport of As from leaf to glume. It is concluded that the decrease of Cd and As in brown rice caused by phosphate fertilizers application was related to the increased iron plaque amount and the inhibition of Cd and As transportation within rice plant.

Key words： phosphate fertilizer As/Cd soil rice iron plaque

Received: 25 May 2020

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	ZHAO Ting-ting
	WANG Chun-li
	ZHAO Xiu-lan

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ZHAO Ting-ting,WANG Chun-li,ZHAO Xiu-lan. Effects of different phosphate fertilizers on iron plaque amount on root surface and arsenic and cadmium uptake by rice grown in a limestone yellow loamy paddy soil[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 297-306.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I1/297

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