福建和溪亚热带雨林地表微生物的数量动态

分枯枝落叶层、腐解层和表土层（0—20cm深）三个层次研究福建和溪亚热带雨林的细菌、真菌和放线菌三大微生物类群的数量和月变化。结果表明：三个层次的微生物数量均以细菌最多，次为真菌，后为放线菌。比较三个层次，各微生物类群在各月份都是枯枝落叶层和腐解层数量较多。同一微生物类群在三个层次的数量均有明显而相似的季节变化；不同类群变化规律不尽相同，但基本只有一个高峰。细菌的高峰值在4月份，真菌约滞后一个月在5月份，放线菌则在8月份才出现高峰。各层次的细菌数和真菌数与月凋落物量、月降雨量和月平均气温各有显著的线性正相关（p＜0．01或0．05），而放线菌则仅与月平均气温显著相关。

CHANGES IN NUMBER OF MICROBES ON THE FLOOR OF SUBTROPICAL RAIN FOREST IN HEXI, FUJIAN PROVINCE

Monthly changes in number of bacteria, filamentous fungi and actinomycetes in the layers of litter, decay and top soil (at 0 - 20 cm depth) of Hexi subtropical rain forest in Fujian Province were studied in 1989. The results showed that dricrobial number in all the three layers was great for bacteria, and less in descending order for filamentous fungi, and actinomycetes. Microbes found in litter and decay 1ayers were more than those in the top soil layer. Distinctive seasonal change in quantity of each microbial group and a similar pattern of monthly dynamics were observed. There was a peak of microbial increasing during the year, in April for bacteria, in May for fungi, and in August for actinomycetes. The number of bacteria and filamentous fungi in each layer was positively correlated with the month1y litter fall, precipitation and mean temperature (p <0.01 or 0.05), while the number of actinomycetes was correlated only with monthly mean temperature.