亚热带常绿阔叶林不同林龄细根生物量及其养分

Fine-root biomass and related nutrients in different aged stands of subtropical evergreen broad-leaved forest

通过对安徽池州老山自然保护区的肖坑常绿阔叶林细根生物量和细根养分进行研究,发现细根生物量和细根养分及养分储量呈明显的垂直分布规律,即随着土层加深而逐渐减少。在表土层,0～10 cm土层中细根生物量最多,氮、磷、钾含量及其养分储量也是最高。对不同年龄阶段的常绿阔叶林比较发现,细根的生物量有随着林分年龄的增加而增加的趋势,而不同年龄林分细根中氮、磷、钾的含量也存在一定差异。

In order to understand the role of fine-root in forest ecosystems, fine-root biomass and related nutrients in a subtropical forest were studied in Xiaokeng forested watershed of Southern Anhui. The results showed that the fine-root biomass was greater in the surface soil layer than that in the low ones in all sampling stands. The contents of N, P and K in fine-root gradually decreased from surface to low soil layer, and so were the storages of N, P and K in fine-root too. Along a successional gradient of the secondary evergreen broad-leaved forest, the fine-root biomass increased with an increase of stand age. There existed significant difference in fine -root biomass between different aged stands. The content of P in fine-root was higher in the young stand than that in the old stand. The contents of N, P and K in fine-root were significantly different between different aged stands of subtropical evergreen broad-leaved forest.