宁南山区不同土地利用方式土壤酶活性特征研究

试验研究不同土地利用方式土壤酶活性特征结果表明,天然草地表层土壤酶活性较高,灌木林地和人工草地次之,果园和农地较低;20~40cm土层果园和农地土壤酶活性稍高;天然草地和灌木林地对土壤酶活性改良效果显著,而果园和农地则较差;土壤蔗糖酶活性在剖面上变化明显,脲酶和碱性磷酸酶活性变化趋势大多一致,过氧化氢酶活性在不同土地利用类型和剖面层次上均无明显差异。土壤蔗糖酶、脲酶和碱性磷酸酶活性互呈极显著正相关,且均与速效氮及有机质呈极显著正相关。土壤酶活性可作为较理想的土壤肥力指标。

Features of soil enzyme activity under different land uses in Ningnan Mountain area

A The features of soil enzyme activity under different land uses were studied. The results indicate that the soil enzyme activity of the natural meadow is the highest, that of the bush forest land and the artificial meadow is the next and that of the orchard and farmland is the lowest; there are higher soil enzyme activities at 20-40cm depths of orchard and farmland;the natural meadow and bush forest have an obvious effect on the restoration improvement of soil enzyme activity, but the orchard and farmland are worst;soil sucrase activity obviously varieties in profile, the activities of urease and alkaline phosphatase almost change in a same way and that of hydrogen peroxidase has no obvious difference not only in profile but also under different land uses. There is an extreme positive correlation among the activities of sucrase, urease and alkaline phosphatase, and every of them has an extreme positive relativity with the soil readily available nutrient and organic matter. So soil enzyme activity can be made as one of the soil fertility index.