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[目的]研究小麦生长过程中Cu和Cd胁迫对土壤蔗糖酶活性的影响。[方法]以烟农19为供试小麦品种,采用盆栽方法,研究小麦不同生育期Cu和Cd胁迫及其复合污染对小麦根区、非根区蔗糖酶活性的影响。[结果]Cu和Cd胁迫下蔗糖酶活性随小麦生育期的推移变化趋势存在一定差异,但从幼苗期到抽穗期同类金属处理下根区、非根区酶活性变化趋势相似,且蔗糖酶活性最大值出现在抽穗期或成熟期。除拔节期,Cu-Cd交互作用增大了Cd单因素作用下的根区、非根区及Cu单因素作用下的非根区的蔗糖酶活性,而对拔节期单因素作用总体表现为降低作用。总体上看,Cu、Cd单独作用下根区蔗糖酶活性大于非根区。[结论]小麦根际对Cu、Cd胁迫下土壤蔗糖酶活性有一定的影响,并随小麦生长时期及重金属种类、处理浓度的不同而存在一定的差异。
[Objective] The research aimed to study the effects of Cu and Cd stress on soil invertase activity during wheat growth. [Method] With tobacco cultivar Yannong 19 as tested wheat variety, pot experiment was conducted to study the effects of Cu and Cd pollution and compound pollution on invertase activity in wheat root and non - root zone at different growth stages. [Result] The activities of sucrase under the Cu and Cd stress had some differences with the changes of wheat growth stage, but the changes of enzyme activities in roots and non - root zones were similar between the seedlings and the heading stage under the same kind of metal treatment, and the sucrase activity The maximum appears at heading or maturity. At jointing stage, Cu-Cd interaction increased sucrase activity in root zone, non-root zone and Cu under non-root zone under Cd single factor, while single factor’s effect on jointing stage decreased overall effect. Overall, sucrase activity in root zone was higher than that in non-root zone under Cu and Cd alone. [Conclusion] The wheat rhizosphere had certain influence on the activity of soil invertase under the stress of Cu and Cd, and there was a certain difference with the growth of wheat and the types and concentrations of heavy metals.