摘要
采用一种可由尼龙布网将甜菜根与土壤分开（但根毛可以穿过）的微型塑料盆钵进行土培试验，研究了两个甜菜品种（Ｃｏｌｉｂｒｉ和Ｅｌａｎ）根际土壤交换性钠含量的分布规律，结果表明：１）两甜菜品种在施钠后，其根际交换性钠的含量分布可用方程ｙ＝ａ（１－ｅ－（ｂ＋ｃｘ）拟合，各方程的决定系数均≥０．９６；２）甜菜在幼苗期吸收钠过程，根际钠离子的迁移主要是通过扩散途径完成的；３）品种Ｃｏｌｉｂｒｉ的吸收钠能力高于Ｅｌａｎ，其根际钠的耗竭距离、单位根长耗竭的土体体积分别比Ｅｌａｎ高出１３％～１８％和２８％～３０％；４）钾素能在一定程度上促进甜菜幼苗对根际土壤中钠的吸收，使根际土壤中钠的耗竭距离、单位根长耗竭的土体体积分别增加５％～９％和９％～１９％，且对品种Ｃｏｌｉｂｒｉ表现出较大的正效应。
By the use of a special mini pot, the charicteristics of sodium uptake in the rhizosphere of two different sugar beet varieties were studied,The results showed that:a)after an application of Na, the distributions of exchangable Na content in the rhizosphere of the two varieties could be fitted by the function y=a(1-e-(b+cx)), and the determinative coefficients of all functions were equal or more than 0.96;b)during the process of Na uptake in the seedling stage of sugar beet, the transfer of Na in the rhizosphere was mainly conducted by means of diffusion;c) the Na uptake ability of the variety Colibri was higher than that of Elan,with its Na depleted distances and depleted soil volumes per unit root being 13%～18% and 28%～30% greater than that of Elan,respectively;d)potassium could to a certain extent stimulate Na uptake in the rhizosphere of the sugar beet seedlings,and make Na depleted distances and depleted soil volumes per unit root to be increased to a range of 5%～9% and 9%～19%, respectively. Comparing the ability of Na uptake in the rhizosphere of Colibri with that of Elan, potassium had a greater positive effect on the former than that on the latter.
出处
《中国糖料》
1998年第3期1-6,共6页
Sugar Crops of China
关键词
甜菜
根际
钠
吸收
钾
Sodium Sugar beet Rhizosphere
