杉木连栽林地营造混交林后土壤微生物的季节性动态研究

SEASONAL DYNAMICS OF SOIL MICROORGANISMS UNDER VARIOUS MIXTURES AFTER CHINESE FIR REPLANTING IN FUJIAN

本文对杉木多代连栽林地及多代连栽后营造不同类型混交林林地土壤微生物的季节性动态进行了研究。研究结果表明:①杉木连栽林地及连栽后营造成不同类型混交林中土壤微生物主要类型的数量季节性变化,土壤呼吸强度和土壤酶活性的季节性变化,总的趋势是春季较高、夏季最高、秋季稍有下降、冬季最低,但不同混交林下表现不同;②连栽杉木后营造不同混交林土壤的微生物生态分布数量、土壤的呼吸强度、土壤酶活性都显著高于杉木连栽林地,这说明连栽后营造不同类型混交林具有良好的改土作用;③不同混交林土壤中,细菌占微生物总量的百分率为建柏+红豆树、柳杉+薄姜木>杉木+樟树、火炬松+罗光石楠>多代杉木林,真菌占微生物总量的百分率为多代杉木林>杉木+樟树、火炬松+罗光石楠>建柏+红豆树、柳杉+薄姜木。这表明不同混交林下由于凋落物的性质不同,参与土壤中有机残体分解的微生物类型,有着显著的差异。

The composition and distribution of the soil microflora, the intensity of soil respiration, and the activity of soil enzymes,under various mixtures after Chinese fir replanting in four seasons in 1987-1988 were studied and found to have a seasonal tendency of variation, being higher in summer, increased in spring and autumn, and lower in winter.The number of scil microorganism,especially soil bacteria,the intensity of soil respiration and the activities of soil enzymes have the following tendency. Fokienia hodginsii + Ormosia hosiei (M2) ,Crytomeria fortunei + Vitex quinata(M3)≥ Pinus taeda + Photinia davidsonine (M1), Cunninghamia lanceolata + Cinnamomum camphora (M4)≥Cunninghamia lanceolata (M5). It was suggested that cultivated mixtures after Chinese fir replanting was an important biological measure for improving soil characteristic undei Chinese fir replanting.