<正>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饽，即随着土层加深而逐渐减少。在表土层，0～10cm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手龄的增加而增加的趋势，而不同年龄林兮细根中氮、磷、钾的含量也存在一定差异。

The chemical constituents from the fresh flowers of Osmanthus fragrans var. thunbergii and O. fragrans var. latifolius were analyzed by GC-MS (gas chromatography-mass spectrometry) with headspace SPME (solid-phase microextraction). The optimum sampling conditions, e. g., the polarity of the fiber coating, the temperature, the method and the time of sampling in the SPME were selected. A total of 34 compounds were identified respectively in the flowers of the two species with a 65μm polydimethylsiloxane and divinylbenzene (PDMS/DVB) SPME fiber assembly. Both quantitive and qualitative differences were found among the chemical compositions of O. fragrans var. thunbergii and O. fragrans vat. latifolius. For example the proprietary component of O. fragrans vat. thunbergii was a-cyelocitral but the proprietary one of O. fragrans var. latifolius was a, a-dihydro-a-ionone. For the same compositions of O. fragrans var. thunbergii and O. fragrans var. latifolius, the difference of the contents was more than 5 times. For example, the contents of/a-Ionone and Trans-a-Ionone in O. fragrans vat. thunbergii were 1.7%and 1.44%but in O. fragrans vat. latifolius they were O. 20%and O. 26%. However the content of Linalool oxide in O. fragrans vat. latifolius was higher than that in O. fragrans var. thunbergii.