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草业学报  2011 

四种耐盐牧草根际盐分动态分布特征

, PP. 68-76

Keywords: 根际,可溶性盐离子,牧草,盐渍化,生物修复

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Abstract:

本试验以引大灌区永登县次生盐渍化土壤为背景,采用盆栽根袋法对4种耐盐牧草根际和非根际土壤pH和盐分离子的分布特征进行了研究。结果表明,随培养时间的延长,土壤pH、电导率和6种主要可溶性盐离子含量降低,4种耐盐牧草根际土壤pH值低于非根际土壤,差异显著(P<0.05)。培养90d后,4种牧草根际土壤电导率均高于非根际土壤。不同培养时段内,盐分离子在根际和非根际土壤中的分布呈动态变化;除培养90d的新疆大叶外,Ca2+和Mg2+在4种牧草的培养期内均在根际土壤出现富集;在培养60d时,田菁根际土壤中K+出现亏缺,但在随后的生长周期内则出现富集,而其他3种牧草培养期间在根际土壤中K+均出现亏缺;除培养90d的新疆大叶和中兰一号外,Na+和Cl-在4种耐盐牧草的培养期内在根际土壤中均出现富集。4种牧草在同一培养时间内,6种可溶性盐离子在根际与非根际土壤之间差异显著(P<0.05)。Na+/Ca2+和Na+/Mg2+降低,表明在大部分生长期间田箐、朝鲜碱茅、中兰一号3种耐盐牧草根际聚集的盐分为NaCl,新疆大叶为MgCl2和MgSO4。

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