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近年来,在云阳发现一种三年桐的新类型,因其树冠狭窄,分枝角度小,故称为“窄冠桐”。我们从1981—1983年对其形态、生长结实情况、经济性状等进行了调查研究,现将获得的资料分析整理于后。 云阳县8个区的12个公社,发现窄冠桐3881株。大都坡陡土薄,高低起伏大的地方。土壤为朱罗纪,蓬莱镇组、沙溪庙组紫色沙、页岩形成的棕紫泥土和灰棕紫泥土,中性偏酸,属中亚热带,湿润气候区的长江河谷干热区。群众历来就有种桐习惯,窄冠桐在这一区域内与米桐混生,主要分布于海拔300—500米,经营方式有成片种植、桐粮间作。
In recent years, in Yunyang found a new type of Tong three years, because of its narrow canopy, branching angle is small, so called “narrow crown Tong.” From 1981 to 1983, we conducted a survey on its morphology, growth and solid conditions, economic traits, etc., and we now analyze the data we have obtained. 12 communes in 8 districts of Yunyang County, and found 3881 strains of Brassica. Most of the steep and thin soil, the ups and downs of the place. The soil is Jurassic, Penglaizhen Formation, Shaximiao Formation purple sand, shale formation brown purple soil and gray brown purple soil, neutral acid, is a dry and hot area of the Yangtze River valley in the subtropical humid climate zone. The public has always had a habit of tung, narrow crown tung in this area mixed with the miso, mainly in the 300-500 meters above sea level, the operating mode of film planting, Tong grain intercropping.