This paper is the result of agricultural geological survey engineering.
[Objective]The uptake and accumulation of selenium in rice grain is determined by the bioavailability of selenium in paddy soils, which can be directly affected by its speciation pattern.In this study, the selenium speciation in soils from the west of Ankang City, Shaanxi province was analyzed to investigate the correlation of selenium content in rice grain with the speciation pattern of selenium in soils.[Methods] The distribution characteristics of seleniumspeciation in soils was examined by analyzing the concentrations of selenium in soils and rice grain.[Results] The concentrations of speciation fractions varied significantly. Detailedly, the humic acid boundfraction of selenium accounted for more than 90% of the total content, whereas the water-solublefraction, ion-exchangeable fraction, manganese oxides fraction and carbonate bounded fraction occupied less than 5%. This study observed a tight relationship between the rice uptake of selenium and its concentration ofwater-soluble fraction andion-exchangeable fraction in paddy soils, which was consistent with the results found in previous studiesand will provide fundamental basis for the development of selenium-rich rice. The average concentration of selenium in rice grainwas 0.20 mg/kg, which met the national standard.[Conclusions] The enrichment degree of selenium in paddy soils from the study area was high. This caused the relative accumulation of selenium in rice grain, which met the national standard. This study reveals broad prospects in the development of selenium-rich rice.
王仁琪,张志敏,晁旭,冯海艳,杨忠芳. 陕西省安康市西部稻田土壤硒形态特征与水稻富硒状况研究[J]. 中国地质, 2022, 49(2): 398-408.
WANG Renqi, ZHANG Zhimin, CHAO Xu, FENG Haiyan, YANG Zhongfang. A study of the Selenium speciation in paddy soil and status of selenium-enriched rice in western part of Ankang City, Shaanxi Province[J]. Geology in China, 2022, 49(2): 398-408(in Chinese with English abstract).