Pb·Zn胁迫对小麦生长过程中土壤蔗糖酶活性的影响

目的]为研究植物根际与土壤酶活性及评价土壤环境质量提供理论依据。方法]通过盆栽试验研究了Ph、Zn单独及复合污染对不同生长时期小麦根区、非根区土壤蔗糖酶活性的影响。结果]Pb胁迫下，从幼苗期到抽穗期，根区蔗糖酶活性的增幅分别为401％．461％和444％，非根区增幅分别为365％、356％和405％；从抽穗期到成熟期，根区蔗糖酶活性的降幅分别为44％、53％和39％，非根区降幅分别为37％、67％和58％：幼苗期根区蔗糖酶活性分别下降了67％、72％和72％，非根区分别下降了68％、69％和72％。Zn胁迫下，根区蔗糖酶活性的最大值与最小值之比分别为8．87、16．45和7．35，非根区分别为7．25、17．04和15．24。在Pb—Zn胁迫下，根区蔗糖酶活性的最大值分别为178．558、175．659和254．752mg／g，非根区分别为163．237、160．338和149．986mg／g。结论]在小麦生长过程中，Pb、Zn胁迫下根区蔗糖酶活性高于非根区。

Influences of Pb and Zn Stress on the Invertase Activity in Soil during the Growth Process of Wheat

Objective] The purpose was to supply theoretical foundation for studying plant rhizosphere and soil enzyme activity and assessing soil environmental quality.Method] The influences of individual and combined pollutions of Pb and Zn on the invertase activity in the soil in root zone and non-root zone of wheat in different growth stages were studied through potting experiments.Result] Under Pb stress,from seedling stage to heading stage,the increase amplitudes of invertase activity in root zone were 401%,46...