庐山不同林分类型土壤活性有机碳及其组分与土壤酶的相关性

Correlation of Soil Active Organic Carbon and Its Components as Well as Soil Enzyme Under Different Forests in Lushan

土壤活性有机碳直接参与土壤生物化学转化过程,影响土壤酶活性,对土壤养分有效化作用明显。以庐山3种不同林分类型下土壤为研究对象,通过对不同林分下土壤活性有机碳及其组分与土壤酶活性状况进行相关分析。结果表明:(1)3种林分类型下WSOC和DOC平均含量排序均为阔叶林>针阔混交林>针叶林,而ROC由大到小依次为针阔混交林>阔叶林>针叶林;针阔混交林下MBC平均含量较高,针叶林下MBC平均含量较低。(2)3种林分类型下土壤蔗糖酶活性排序为针阔混交林>阔叶林>针叶林;纤维素酶和酸性磷酸酶活性的大小顺序为针叶林>针阔混交林>阔叶林;针阔混交林下脲酶活性最低,阔叶林最高;针阔混交林下多酚氧化酶活性最高,阔叶林最低;过氧化氢酶活性高低序列为阔叶林>针阔混交林>针叶林。(3)3种林分类型下土壤蔗糖酶、纤维素酶等水解酶与土壤活性有机碳各组分的相关性较好,多酚氧化酶、过氧化氢酶等氧化酶与土壤活性有机碳各组分之间没有表现出明显的相关性。

Soil active organic carbon is directly involved in soil biochemical conversion, which affects soil en zyme activities and plays an important role in soil available nutrient contents. The relationship between soil active organic carbon, its components and soil enzyme under three types of forests in Lushan were analyzed. Results are as follows. Firstly, the average WSOC and DOC contents decreased in the order： broadleaved forest^mixed wood,coniferous forest, while the ROC contents from high to low level is mixed wood~ broadleaved forest^coniferous forest. The average MBC under mixed wood was much more than those under the other two forests and coniferous forest was the lowest. Secondly, soil intertase activity under three types of forest decreased in the order： mixed wood^broadleaved forest ~ coniferous forest. Urease activity and polyphenol oxidase activity varied in the same order as that of soil invertase activity, cellulase and acid phos phatase activity from high to low level is coniferous forest）mixed wood^broadleaved forest, while catalase activity decreased with an opposite order. Thirdly, components of soil active organic carbon under three types of forests were closely related to soil invertase and cellulose activity but no obvious positive correlation was noted between components of soil active organic and polyphenol oxidase and catalase activity.