不同类型林分土壤微生物生理类群分析

本研究就三种不同处理林分土壤微生物生理类群的初步分析,表明杉木马尾松混交后有利于固氮微生物的生长,固氮微生物数量的增加,促进了混交林分生长;有利于氨化细菌的生长,氨化细菌数量的增加,又利于提高含氮有机物的分解和转化速率,从而提高混交林地土壤肥力;同时促进了纤维素分解菌的生长,利于有机物的转化和加快碳素循环速率,从而为植物生长提供更多的碳素和能源。因此,在混交林中杉木的平均胸径比对照提高24%,平均树高比对照提高21%;马尾松平均胸径比对照提高20%,平均树高比对照提高19%,可见营造杉、马混交林比纯林更具发展潜力,可实现树高、胸径积累的双赢。

A Study on the Microorganism Populations in the Soils from Different Types of Forests

The microorganism populations in the soils from different types of forests including China fir pure forest,Masson pine pure forest and the firpine mixed forest were analyzed.The result showed that in the soil of mixed forest the population of nitrogen-fixing microorganism,ammonifying bacteria and the cellulose-degrading fungi are all much higher,and they are all beneficial to the growth of the plants.According to the measurement,both the height and DBH of the plants in the mixed forest were much higher than that in the pure forests.