福建含笑和杉木纯林及混交林中龄期生物量研究

为了解福建含笑和杉木混交对其中龄期生长量、生物量及土壤肥力的影响，对福建省建瓯市中龄期福建含笑和杉木纯林及混交林进行研究。结果表明：福建含笑和杉木混交林中杉木的平均胸径、平均树高和单株材积分别比杉木纯林提高了2．3％、2．9％和8．5％；混交林土壤肥力各指标较各树种纯林均有所提高；各林分总生物量以混交林为最高，其排序为：混交林（121．13t／hm2）〉杉木纯林（107．27t／hm2）〉福建含笑纯林（84．50t／hm2）。

Biomass of Half-Matured Mixed Forest of Michelia fujianensis and Cunninghamia lanceolata and Their Pure Stands

A comparative study was conducted on the mid aged pure stands of Michelia fujianensis, Cunning- hamia lanceolata and their mixed plantation in Jianou Municipality of Fujian Province to explore the influence of stand composition on the growth rate and biomass of the mid aged trees, as well as on the soil fertility. The results showed that the average DBH, average height and the average stocking of the Cunninghamia lanceolata individual trees in the mixed plantations was respectively increased by 2, 3%, 2. 9% and 8.5% compared to those of in the pure plantation. The soil fertility indexes of the mixed plantations were generally higher than those pure stands of either tree species. The total biomass of the mixed plantations was the highest and the order of this index was mixed plantation （121.13 t/hm2） 〉 pure Cunninghamia lanceolata plantations （107.27 t/hm2） 〉 pure Michelia fufianensis plantations （84. 50 t/hm2 ）.