人工阔叶红松混交林改良土壤效果分析

Effects of artificial broadleaved-Pinus koraiensis mixed forest on the soil improvement

为研究人工阔叶红松混交林的土壤变化,以辽东山区人工营造的5种典型阔叶红松混交林为研究对象,对其土壤理化性质进行了测定,结果表明:各类型阔叶红松混交林单位面积凋落物现存量(未分解和半分解)均低于红松纯林,其中白桦-红松的凋落物现存量为红松纯林的91.9%,而紫椴-红松混交林的凋落物现存量仅为红松纯林的35.7%;不同类型的阔叶红松林土壤有机质含量均高于红松纯林,其中紫椴-红松混交林的土壤有机质含量最高。不同土层不同类型阔叶红松林的碱解氮含量均高于红松纯林,其中紫椴-红松的碱解氮含量最高;各阔叶红松林的速效磷、速效钾含量均高于红松纯林,水曲柳-红松混交林不同土层速效磷含量最高,色赤杨-红松混交林不同土层速效钾含量最高。各类型阔叶红松混交林的土壤渗透速度高于红松纯林,土壤理化性质均好于红松纯林。

In order to study the soil property changes of the artificial broadleaved-Pinus koraiensis mixed forest,soil physicochemical properties were measured in five types of artificial broadleaved-P.koraiensis forest in the mountainous area of eastern Liaoning.The results indicated that:the litter amount per unit area(undecomposed and semi-decomposed)of the mixed broadleaved-P.koraiensis forests were smaller than that of the pure P.koraiensis forests.The litter stock in Betula platyphylla-P.koraiensis forest was 91.9%of that in the pure P.koraiensis forest,while the litter stock in the mixed Tilia amurensis-P.koraiensis forest was only 35.7%of that in the pure P.koraiensis forest.Soil organic matter contents in mixed broadleaved-Pinus koraiensis forests were higher than that in pure artificial Korean pine forests,among which soil organic matter content in mixed Tilia amurensis-P.koraiensis forest was the highest.Alkali-hydrolyzed nitrogen content in each soil layer in mixed forests was higher than that in pure P.koraiensis forests,and alkali-hydrolyzed nitrogen content in mixed T.amurensis-P.koraiensis forest was the highest.The contents of available P and K in mixed forests were higher than those in pure P.koraiensis forest.The content of available P in different soil layers of Fraxinus mandshurica-P.koraiensis forest was the highest while the content of available K in different soil layers of Alnus tinctoria-P.koraiensis was the highest.The soil infiltration rates of mixed forests were higher than that of pure P.koraiensis forest,and the soil physicochemical properties of mixed forests were higher than that of pure P.koraiensis forest.