闽北5种乡土阔叶树种幼林生长量及其对土壤肥力的影响

在福建省光泽县的杉木(中、下坡)和马尾松(上坡)林采伐迹地上营造5个乡土阔叶树种和马尾松(对照)试验林.7年生时调查结果表明,鹅掌楸、厚朴、枫香、观光木生长较好,平均树高均超过5 m,高于马尾松,而华东野核桃生长最差,平均树高仅2.9m,低于马尾松.5种阔叶树在山坡中下部生长量和造林保存率均高于山坡上部.与马尾松林地相比,阔叶树林地表层(0～20 cm)土壤容重有不同程度降低,有机质、全N、水解性N、速效P和速效K含量均有不同程度的增加,而20～40 cm土层土壤性质差别不大.

Growth of 5 Native Broad-Leaved Tree Species Plantation and Their Impacts on Soil Fertility in Northern Fujian Province,China

5 native broad-leaved tree species and Pinus massoniana trial plantations were established on cutover plantations of Cunninghamia lanceolata(middle and lower slopes)and Pinus massoniana(upper slopes).7 years after planting,Liriodendron chinense,Magnolia officinalis,Liquidambar formosana and Toona ciliata var.pubescens grew well,their mean tree height were over 5 m and higher than P.massoniana.Juglans cathayensis var.formosana grew poorly,its mean tree height was only 2.9 m,lower than P.massoniana.All the 5 native broad-leaved tree species grew better and showed higher survival rate on middle and lower slopes than on upper slopes.Compared with planting P.massoniana plantation,7 years after planting the broad-leaved tree species plantations,top layer(0～20 cm) soil bulk density decreased in different degrees,organic matter,total N,hydrolyzable N,available P and available K increased in different degrees.Planting broad-leaved tree species had little impacts on soil properties at 20～40 cm layer.