锗在土壤-水稻系统的迁移累积及其影响因素

Translocation and Accumulation of Germanium in Paddy Soil-Rice Plant System

为了探究锗在土壤-水稻系统中迁移累积及其影响因素,确定锗元素与作物吸收的相关性,采集了重庆市南川区根系土壤和水稻籽实样品各76件,测试了土壤有机质、土壤pH和土壤-水稻籽实元素含量,并对这些参数进行了相关性分析。实验结果表明重庆市南川区土壤锗元素含量较高,平均值为1.50 mg/kg,高于我国土壤锗元素含量的平均水平(1.30 mg/kg),而南川区水稻籽实中锗元素平均含量仅为0.023 mg/kg。南川区水稻锗的平均生物吸收系数不高(0.42%~3.89%),都在极弱到微弱摄入标准范围内,说明在实际生产中并没有大量的锗元素从土壤迁移累积到水稻籽实中。分析表明南川区土壤有机质和p H对水稻中锗的吸收无相关性,而与土壤中氧化钾(K_2O)、三氧化二铝(Al_2O_3)、锌(Zn)、镍(Ni)呈极显著负相关,与氮(N)、总铁(TFe_2O_3)、铅(Pb)、铬(Cr)呈显著的负相关。

In order to find the translocation and accumulation of germanium in paddy soil-rice plant system and its affecting factors,76 groups of soil and rice samples were collected in Nanchuan district of Chongqing city.The soil samples exhibited germanium concentrations of 0.56~3.86 mg/kg with an average of 1.50 mg/kg,higher than the mean abundance of 1.30 mg/kg in China and the background value of purple soil in Chongqing.However,the averaged germanium content of the rice samples was only 0.023 mg/kg.The average biological absorption coefficient(0.42%~3.89%)of rice germanium Nanchuan District is not high and in the range of extremely weak to weak consumption standard,shows that there is no large number of germanium in Nanchuan district migrated and accumulated from the soil to rice seeds.Based on the experimental results,absorption germanium of rice in Nanchuan District had no correlation with pH and organic carbon,but was significantly negatively correlated with K2O,Al2O3,Zn and Ni in soil,with significant negative correlation with N,TFe2O3,Pb and Cr.