油桐是我国重要的特用经济树种,历来栽培面积和产销量占世界第一,四川省的栽种面积和产销量在全国居第一位。近年来随着经济的日益发展,油桐栽培区域已由平地向丘陵、山地发展。山地桐林面积日益扩大,进行海拔高度对油桐生长和结实影响的研究,可以为油桐主产区进行山地经济开发规划提供有价值的资料。我们于1982～1986年在四川省万县设点观测,结果整理如下。 Tung tree is an important special economic tree species in our country. Traditionally, its cultivated area and production and sales account for the first place in the world. Sichuan’s planted area and production and sales volume occupy the first place in the country. In recent years, with the growing economy, tung oil cultivation area from the flat to the hills and mountains. The increasing of the area of ​​Tonglin Mountain makes it possible to provide valuable data for the economic development of mountainous area in the main producing areas of Tung Oilseed. We set up observation points in Wanxian County, Sichuan Province from 1982 to 1986 and summarized the results as follows.