中文摘要：

采用对比分析方法,研究了小兴安岭地区阔叶红松混交林在进展演替过程中（形成阶段、发展阶段、稳定阶段和顶级群落）土壤各发生层（A1、B和C层）酶活性,及其与土壤养分有效性和活性有机碳之间的关系。结果表明：土壤脲酶、蔗糖酶、过氧化氢酶、多酚氧化酶活性在进展演替中A1层土壤酶活性明显高于B和C层。而在A1层中土壤脲酶活性、过氧化氢酶活性和土壤蔗糖酶活性在发展阶段较形成阶段有不同程度的下降。土壤多酚氧化酶活性的变化是随着演替阶段的进行呈递减趋势。土壤脲酶、蔗糖酶、多酚氧化酶和过氧化氢酶与土壤养分之间均存在相关关系。其中,土壤脲酶和土壤蔗糖酶活性分别与速效钾、有效磷、有机质和全氮呈极显著相关,而过氧化氢酶和多酚氧化酶与全氮、速效钾、有效磷、有机质也表现出显著相关。此外,土壤脲酶、过氧化氢酶和多酚氧化酶活性与易氧化碳、微生物量碳达到显著相关,与溶解性有机碳不显著相关。而蔗糖酶与3种活性有机碳的相关性均达到显著水平。土壤酶活性与土壤养分特征可以作为一个综合指标,来指示小兴安岭地区不同演替阶段的土壤肥力水平。

英文摘要：

We studied the enzyme activity in each soil layer（ A1,B,and C） and its relationship with soil nutrient availability and active organic carbon to provide scientific proofs for soil fertility evaluation in the process of progressive succession（ formation stage, development stage, stability stage, and climax community） in broadleaf and Korean pine mixed forest in the Xiaoxing ＇anling Mountains by using comparative analysis. The results showed that,the activities of soil enzymes of urease,invertase,catalase and polyphenol oxidase in A1 layer were all significantly higher than in B and C layers in the process of progressive succession. However,the activities of urease,invertase,catalase and polyphenol oxidase in A1 layer were higher to varying degrees in the formation stage than in the development stage. The variation in polyphenol oxidase activity presented a decreasing trend as succession stage progressed.There existed correlations between soil nutrients with activity of soil enzymes urease,invertase,and catalase and polyphenol oxidase. There were highly significant correlations between soil urease,invertase,and rapid K, available P, organic matter, and total N, respectively, but significant correlations between activity of catalase,polyphenol oxidase,and total N,rapid K,available P,and organic matter,respectively. In addition,there was a significant correlation between the activity of urease, catalase, polyphenol oxidase with labile organic carbon and microbial biomass carbon,respectively,but no significant correlation with dissolved organic carbon. The correlations of invertaseactivity with three types of organic carbon all reached significant level. Soil enzyme activity and nutrient characteristics can be used as comprehensive indexes,which indicate soil fertility levels of different succession in the Xiaoxing＇anling region.