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作物学报 ›› 2008, Vol. 34 ›› Issue (03): 506-512.doi: 10.3724/SP.J.1006.2008.00506

• 耕作栽培·生理生化 • 上一篇    下一篇

烤烟苗期含硒量和根际硒形态的研究

秦恩华1;杨兰芳2,*   

  1. 1 湖北民族学院生物科学与技术学院，湖北恩施445000；2 湖北大学资源环境学院，湖北武汉430062
  • 收稿日期:2007-05-24 修回日期:1900-01-01 出版日期:2008-03-12 网络出版日期:2008-03-12
  • 通讯作者: 杨兰芳

Selenium Content in Seedling and Selenium Forms in Rhizospheric Soil of Nicotiana tabacum L.

QIN En-Hua1,YANG Lan-Fang2,*   

  1. 1 School of Biological Science and Technology, Hubei Institute for Nationalities, Enshi, 445000, Hubei; 2 School of Resource and Environmental Science, Hubei University, Wuhan 430062, Hubei, China
  • Received:2007-05-24 Revised:1900-01-01 Published:2008-03-12 Published online:2008-03-12
  • Contact: YANG Lan-Fang

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1142

被引次数

7

摘要： 以烤烟品种NC89为试材, 通过天然含硒和低硒土施硒处理的盆栽试验，对烤烟苗期含硒量和根际-根外土壤硒的存在形态进行了分析。结果表明，烤烟苗期根系含硒量高于地上部，并随天然含硒和施硒量的增加而增加，且与施硒量呈极显著的正相关。天然含硒土中，残渣态硒（Res-Se）占2/3以上，而低硒土施硒下，KH2PO4-Se所占比例最大。无论天然含硒土还是施硒低硒土，水溶性硒（H2SO4-Se）所占比例均不到1%，而根际土壤总硒、KH2PO4-Se和NH3·H2O-Se的含量均高于根外土。土壤施硒处理的NH3·H2O-Se占总硒的比例高于根外土壤，而Res-Se所占比例低于根外土。由此可见，烤烟能够富集土壤中的硒，天然含硒土和低硒土施硒的硒形态分布不同，施硒土壤硒的有效性高于天然含硒土，烤烟根际硒的有效性高于根外土，烤烟根际通过促进有机态硒的形成而减少土壤矿物对硒的固定来提高土壤施硒的有效性。

关键词: 烤烟, 苗期, 天然含硒土, 土壤施硒, 根际, 硒形态

Abstract: Selenium (Se) is an essential trace element for human and animals, and it may be beneficial to increase Se content of tobacco (Nicotiana tabacum L.), but the relationship between Se availability and forms in soil for plant growth had been rarely reported so far. In order to understand the relationship between the Se content in tobacco and soil, and to develop Se-enriched tobacco, we performed a pot experiment using cultivar NC89 with natural Se-enriched and Se-supplied soil treatments. The Se content in seedlings and the Se forms in rhizospheric and nonrhizospheric soil were analyzed. The results showed that selenium content was higher in roots than in shoots of tobacco at seedling stage; it increased both in roots and shoots of tobacco with increase of Se level in natural Se-enriched soil, and there was a significant correlation between Se content and soil Se applications. In natural Se-enriched soil, the residual Se (Res-Se) content was the highest which accounted for more than 2/3 of the total Se in middle and high Se-enriched soil, while in Se-supplied soil, the content of extractable Se with KH2PO4 (KH2PO4-Se) was the highest which accounted for 43%–46% of total Se and was significantly correlated to Se content in tobacco. Both in natural Se-enriched and Se-supplied soil, content of extractable selenium with K2SO4 (K2SO4-Se) was the least which was less than 1% of total selenium, but the contents of total selenium, KH2PO4-Se and NH3·H2O-Se were significantly higher in rhizospheric soil than in nonrhizospheric soil. In Se-supplied soil, the percentage of NH3·H2O-Se was higher and the percentage of Res-Se was lower in rhizosphere than in nonrhizosphere. Our experiment showed that tobacco could accumulate Se well from soil, and absorb Se easier from Se-supplied soil than natural Se-enriched soil. The rhizosphere of tobacco, where distributed more available Se, can promote the formation of NH3·H2O-Se and reduce the Se fixation with minerals in soil, therefore increase Se availability in soil.

Key words: Nicotiana tabacum L., Seedling stage, Natural Se-enriched soil, Se application in soil, Rhizosphere, Se form

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