湖南3种混交林土壤酶活性的差异研究

以湖南3种混交林土壤为研究对象，以榉树及杉木2种纯林为对照，分析林分土壤过氧化氢酶、过氧化物酶、蛋白酶、脲酶等土壤酶活性，评价不同的混交模式对林地的影响。结果表明：不同混交模式下，绝大部分土壤酶活性均存在显著差异，特别是表层土壤显著性更加明显；所有混交模式中，混交林林分土壤酶活性均显著高于杉木纯林，混交林和纯林酶活性高低程度均表现为上层>中层>下层；在丘陵地营造6杉木2榉树2南酸枣混交林能够较好地提高土壤酶活性。

Soil Enzyme Activity Differences of 3 Types of Mixed Plantations in Hunan

Taking 3 types of mixed plantations soil in Hunan as the research object and 2 types of pure plantations of Zelkova serrata and Cunninghamia lanceolata as the control. The activities of soil enzymes such as catalase, peroxidase, protease and urease were analyzed to evaluate the effects of different mixed modes on plantationsland. The results showed that most of the soil enzyme activities had significant differences under different mixed plantations mode, especially the surface layer was more obvious. In all mixed plantations mode, the soil enzyme activities of mixed plantations were significantly higher than pure Cunninghamia lanceolata plantations. The rule of soil enzyme activities in difference soil layers was the surface > middle > lower. In the hill country area, the mixed plantations (Cunninghamia lanceolata:Zelkova serrata:Choerospondias axillaris=6:2:2) had better effect of improving soil enzyme activity.