烟草根际土壤硒、硫形态相互作用与烟草对硒、硫吸收的研究

通过烟草根际营养试验研究发现，烟草根际土壤Ｓｅ总量及可溶态Ｓｅ、交换态Ｓｅ有机Ｓｅ均表现明显的亏缺，而根际土中Ｓ总量及吸附性Ｓ、有Ｓ则表现明显的富集，施Ｓ对根际土Ｓｅ亏缺程度的影响与施Ｓｅ处理有关，而施Ｓｅ对根际土Ｓ富集程度的影响施施Ｓ的水平而有一定差异，未施Ｓｅ处理时，施Ｓ降低了烟草根际土中相应几种Ｓｅ形态的亏缺率、施Ｓｅ处理时施Ｓ的影响则相反，不施Ｓ时，加入Ｓｅ可以增加根际土全Ｓ量的富集程度；

Interaction of Se and S forms in rhizospheric soil and their absorption by tobacco

Pot experiment with tobacco shows that the amount of total,solube,exchangeable and organic Se in rhizospheric soil appeared depletory,while that of total,adsorbed and organic S appeared enriched.The influence of added S on Se depletion depended on the level of Se application,and that of added Se on S enrichment depended on the rate of S applicagtion.In the absence of added Se,the addition of S decreased the depletion of several Se forms ;while in its presence,the reverse result was obtained.The addition of Se increased the enrichment of total S when the S was not added.With S application,the added Se reduced the enrichment of total S.At early stage,teh Se content of tobacco was mainly influenced by the soluble Se in rhizospheric soil,while the accumulated amount of Se in tobacco was also influenced by exchangeable,organic and acid soluble Se.The S content in the aboveground part of tobacco at its early stage was mainly influenced by soluble and organic S in the rhizosphere.