不同土地利用方式下土壤酶活性的变化研究

STUDY ON THE CHANGES OF SOIL ENZYME ACTIVITY UNDER DIFFERENT LAND USE TYPES

选择黑龙江省海伦市相邻耕地和林地作为研究对象,分析了土地利用方式、土壤深度以及部分地球化学特征等对土壤中蔗糖酶、脲酶、过氧化物酶活性的影响.结果表明:蔗糖酶受土壤深度影响较为明显,表层土壤中蔗糖酶活性显著高于深层土壤,而与土地利用方式无关;脲酶受土壤深度影响较小,但土地利用方式对其影响较大,如种植大豆可以显著提升土壤脲酶的活性,除此之外脲酶活性还受土壤黏粒含量的影响;过氧化物酶活性主要受控于土壤有机碳的含量,受土壤深度影响较小,但深层林地土壤中过氧化物酶活性显著高于深层耕地土壤.

Focusing on the cultivated land and forest land in Hailun City of Heilongjiang Province,the paper analyzes the effects of land use types,soil depth and some geochemical characteristics on the activity of soil sucrase,urease and peroxidase.The results show that sucrase is significantly affected by soil depth,with the sucrase activity in surface layer obviously higher than that in deep layer,but not by land use types;while urease is less affected by soil depth than by land use types.Therefore soybean planting can drastically increase soil urease activity.Besides,urease activity is also affected by soil clay content.The peroxidase activity is mainly controlled by soil organic carbon(SOC)content,with less affection by soil depth,but the peroxidase activity in deep soil of forestland is significantly higher than that of cultivated land.