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景阳桐是郧西产油桐(Aleurifes fordiiHeml)中的一个优良农家品种,具有树形小,结果丛生性强,果大皮薄、出籽率、出油率高等特点,主要分布县境西南. 1978年,我们在进行全县油桐品种资源调查时,于景阳公社灯塔大队棠梨树亚发现,经过几年的观察,现将有关情况分述如下: 一、地理环境景阳公社灯塔大队棠梨树亚,位于汉江上游鄂陕交界处(东经109°46’北纬32°57’),海拔560米,属秦岭余脉山河谷地带,该地年平均降雨量815.9毫米,蒸发量1526毫米.年平均气温14℃.一月1℃.七月26.5℃,极端高温40.5℃,低温-13.9℃,有效积温4697.6℃,日照率38%,无霜期222天.土壤为山地石渣土和姜黄土.成土母岩主要为千枚岩,土质瘠薄,石砾约占30-75%,PH值6.5-7.6,天然植被稀少. 二、形态特征: 景阳桐树高3-4米,最高6.1米,冠幅
Jing Yang Tong is an excellent farmer cultivar in Aleurifes fordiiHeml. It has the characteristics of small tree shape, strong tufts, thin skin, high seed yield and high oil yield. It is mainly distributed in the southwest of the county In 1978, when we conducted a survey on the resources of Tung Oil Tung in the county, we found at the Tang Lishu Shuya Lighthouse Brigade of Jingyang Commune that after several years’ observation, the relevant points are as follows: I. Geographical Environment Jingyang Commune Lighthouse The brigade Tangliashuya, located at the junction of the Hubei and Shaanxi provinces at the upper reaches of the Han River (longitude 109 ° 46’N latitude 32 ° 57 ’) and 560 meters above sea level, belongs to the Qinma Mountains and valleys and valleys, with an average annual rainfall of 815.9 millimeters and an evaporation of 1526 Mm. The annual average temperature of 14 ℃. January 1 ℃. July 26.5 ℃, extreme high temperature 40.5 ℃, low temperature -13.9 ℃, effective accumulated temperature 4697.6 ℃, sunshine rate 38%, frost-free period 222 days. Loess. Into the parent rock is mainly phyllite, infertile soil, about 30-75% gravel, PH value 6.5-7.6, rare natural vegetation. Second, the morphological characteristics: Tong Yang Tung high 3-4 meters, the highest 6.1 meters, crown width