施硒对紫云英硒积累及土壤硒状况的影响

摘要

通过设置7个不同的施硒(Na2SeO3)水平(O、0.5、l、2、4、8、16、32 mg/kg),研究硒对紫云英(Astragalus sinicus)硒积累及土壤硒状况的影响.结果表明:硒肥对紫云英株高、茎粗、生物量等生长性状影响不明显;随着施硒量的增加,紫云英含硒量也随之增加,两者相关性(r=0.99)达到极显著水平;随着硒肥用量的增加,硒肥利用率不断下降,不同处理硒肥利用率为0.89％ ～3.25％;随着施硒量的增加,土壤中的全硒和有效硒含量也随之增加,但是土壤中硒的残留率却有着相反的趋势,不同处理硒的残留率为41.82％ ～82.64％.%An experime nt was carded out to study the effects of applying selenium with different seven concentrations (0,0.5,1,2,4,8,16,32 mg/kg) on selenium accumulation of Chinese milk vetch (Astragalus sinicus) and selenium status in soils.The results indicated that selenium application did not exert its significant positive influence on stem diameter and height,and biomass.However,Chinese milk vetch selenium content was increased with the increment in the selenium supplementation level,and there were greatly significant correlation (r=0.99") between them.The utilization rate of selenium fertilizer was decreased with the increment in the selenium supplementation level,and the utilization rates of selenium fertilizer were 0.89％-3.25％ under different treatments.The concentrations of total selenium and available selenium in soil were increased with the increment in the selenium supplementation level,but the residual rate of selenium in soil had the opposite trend,and the residual rates of selenium were 41.82％-82.64％ under different treatments.