九龙江口红树林土壤微生物的时空分布

Abstract

[中文文摘]研究了福建九龙江口秋茄(Kandelia candel)林与白骨壤(Avicennia marina)林土壤及其相应的对照光滩0~20cm、20~40 cm和40~60 cm 3个层次土壤好氧异养细菌、放线菌和丝状真菌3类微生物数量时空分布及其与土壤主要理化因子的关系.结果表明:秋茄林与白骨壤林土壤及其相应的对照光滩土壤的细菌、放线菌和丝状真菌和微生物总数在3个土壤层次中,随着土壤深度的增加而下降,差异显著;两个红树林及其对照光滩土壤的微生物数量均以夏季最多,冬季最少,春秋季位于夏冬两季之间,或高或低,但差值不大;红树林土壤各类群微生物数量多显著高于相应对照光滩;秋茄林土壤各类群微生物数量显著高于白骨壤林土壤.土壤微生物数量与主要理化因子间的多元回归分析显示:与两个红树林土壤微生物数量关系最密切的因子是全氮和全磷而不是有机质,这可能与微生物数量及其活性对氮和磷有着相对重要的调控作用有关.[英文文摘]Temporal and seasonal distribution of bacterial, actinomycetes and fungal densities and the relation between microbial densities and physi-chemical factors in three soil layers (0~ 20 cm, 20~ 40 cm and 40~ 60 cm) were investigated in K andelia candel forest, Avicennia marina forerst and their corresponding mudflats in Jiulong jiang Estuary of Fujian. The results indicated that the bacteria, actinom ycetes and fungi densities of soil declined with increase of soil depth in three soil layers in two mangrove forests and their corresponding mudflats, and v ariation in microbial densities was significant among three layers. The most abundant microorganisms were presented in summer and the least in winter; difference in densities between spring and autumn was litt le. Microbial densities of soil in two mangrove for ests were significantly greater t han that in their corresponding mudflats. Microbial densities were significantly greater in K . candel for est than in A. marina forest. The multiple regression analysis indicated t hat the r elation between total nitrogen, total phosphorus and microbial densities were the most outst anding, which probably meant that microbia l abundance and activity played an important role in controlling nitrogen and phosphorus.