台湾桤木引种造林及其培肥能力的研究

台湾桤木首次由台湾引入福建造林试验结果表明：幼树生长发育正常，已开花结实，较耐寒，较少病虫害，适应引种区生境，在土壤湿润的立地上幼林生长良好，８年生林分蓄积量１４６．７～２５０．２ｍ３／ｈｍ２；４年生幼树根瘤年固氮量５４７．８ｋｇ／ｈｍ２．具有早期速生和固氮量大的优良特性，宜于适生立地推广应用．

Research into Silvicultural and Nitrogen-fixing Characteristics of Alnus formosana

Alnus formosana, one nonleguminous nitrogen-fixing tree that grows in Taiwan Province, first introduced to plant in Nanping city, Tongan County and Dongshan County, Fujian Province. This paper researched into the silvicultural and nitrogen-fixing characteristics, the results showed that Alnus formosana could grow well and reproduce successfully in the experimental areas, the stocking of 8-aged stands amouted to 146. 7～250. 2m3/hm2. Alnus formosana also had available nitrogen-fixing ability in introduction re gions, which was affected and restricted by soil temperature, light, seasonal change and age etc, the nitrogen -fixing determinations indicated that the fixed nitrogen amount of 4-aged tree could reach to 547. 8 kg/hm2 per year.