关键词: 水稻, 磷, 砷, 产量, 生物量, 食品安全性

Abstract: 【Objective】The objective of this study was to clarify the effects of P additions and P-efficiency on grain yield, biomass and quality of rice in As-contaminated soil, and discuss agronomic measures for mitigation of As accumulation in rice. 【Method】Low-P tolerant rice cultivars 99011 with high P-absorption-efficiency and 580 with high P-use-efficiency, and low-P sensitive rice cultivar 99056 were used in a pot experiment to study the effects of P additions on grain yield, biomass and P and As concentration in the straw, husk and brown rice in moderate and high As-contaminated soils.【Result】Compared to no As-contamination treatment, 50 mg?kg-1 of As increased the biomass of three supplied rice slightly, but decreased grain yield significantly. Both the biomass and the grain yield increased significantly with the increase of P supply. As at 100 mg?kg-1 decreased both the biomass and the grain yield significantly. The biomass increased obviously with increasing P supply, however, the grain yield was the highest at 30 mg?kg-1 of P level but the lowest (0) at 150 mg?kg-1 of P level. Under As-contaminated conditions, the As concentration in different organs were straw >> husk >> brown rice, and they increased with increasing P and/or As additions. In As stress or P and As double stress soils, the grain yield, biomass and the P concentration in straw, husk and brown rice were all 99011＞580＞99056, with remarkable difference among three rice cultivars, moreover, the difference among the three rice cultivars increased with the reduce of P supply and the increase of As supply. The As concentrations in straw, husk and brown rice were all 99056＞580＞99011, with prominent difference among the three rice cultivars, moreover, the difference among the three rice cultivars increased with the increase of P and/or As supply. Under the conditions of As addition was ≤50 mg?kg-1and P supply was ≤30 mg?kg-1, low-P tolerant rice cultivar 99011 could get considerable grain yield and the As concentration in brown rice was lower than the national food safety standard. 【Conclusion】Under As-contaminated conditions, the grain yield and the quality of rice are closely related to the P additions and the uptake ability of rice to low concentration of P. Using rice cultivars with high P-absorption-efficiency and reducing P fertilizer input properly are promising rotes for getting considerable production with reduced grain As in moderatly and slightly As-contaminated soil.

Key words: rice, phosphorus, arsenic, grain yield, biomass, foodsafety