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光桐(三年桐)与皱桐(千年桐)均属大(卓戈)科油桐属,为我国特产的两个特用经济树种.光桐主要分布在北亚热带及其附近地区,以湘、川、黔、鄂、浙等省栽培较为集中,垂直分布在海拔200—800米以下低山丘陵地区.皱桐主要分布在南亚热带及其附近地区,适生于滇、闽、桂、粤、黔等省区大山区,且多混生在海拔1000米左右的常绿和落叶阔叶林中,喜温暖湿润气候,人工栽培时间短.目前我国长江以南部分省区,如湘、赣、浙等省已在竞相引种.本文系本所近几年来对这两个油桐树种的生育特性所作的观察与分析,现整理成文为生产提供参考.一、观察林分自然概况观察林分位于南京东善桥东大山南坡的两块油桐林内.早期为稀疏松林,经垦复、定点、开穴,于1964年区划栽植光桐和皱桐.前期处于荒芜状态,1978年才开始伐除残留松树,加强抚育管理.该地土壤为粉砂轻壤土,肥力较低,0—50厘米表层土镶有机质含量0.97—
Diandong (Trichosanthes) and Zanthoxylum bungeanum (Trichosanthes kirilowii) are both large (Zhuo Ge) Section of the genus Paulownia, two special economic species of China’s specialty.Diaodong mainly distributed in the northern subtropics and its vicinity to Guizhou, Sichuan, Guizhou, Hubei, Zhejiang and other provinces are more concentrated, vertically distributed in the hilly region of 200-800 meters above sea level.Drygium mainly distributed in the southern subtropics and its vicinity, suitable for Yunnan, Fujian, Guangxi, Guangdong, Guizhou and other provinces and large mountainous areas, and more mixed at about 1,000 meters above sea level in the evergreen and deciduous broad-leaved forest, like warm and humid climate, artificial cultivation time is short. At present, some provinces and autonomous regions south of the Yangtze River, such as Hunan, Jiangxi, Zhejiang And other provinces have been competing to introduce.This article is the Institute of these two tung tree growth and development characteristics observed and analyzed in recent years, is now organized and written for the production of reference.First, observe the forest natural overview Stands in Nanjing Dongshan Qiaodongshan two slopes of tung tree forest.Because early sparse pine forest, reclamation, fixed-point, open-hole, in 1964 planted tung tung and wrinkled tung. Pre-barren state, started in 1978 to remove Residues of pine trees, strengthen tending management. The soil is silty light loam soil, fertilizer Low force, 0-50 cm topsoil organic matter content of 0.97-