丹江口库区柏树生长主导因子及生长过程研究

study on Dominant Factors and Growth process of cupressus funebris Ecological Forest in Danjiangkou Reservoir Area

摘要:

为给困难立地造林提供技术支撑,笔者对丹江口库区柏树生长的主导因子和生长过程进行了分析 。结果表明, 丹江口库区的柏树生态林优势树种以柏木和侧柏为主(分别 占 60. 87%和 36. 25%) 。影响侧柏林分平均高的主导因子为 土层厚度、土壤类型和坡度;最宜于侧柏生长的主导因子组合分别为:土层>20cm,黄棕壤类,坡度≤15。;土层>20cm, 石 灰土类,坡度≤15。。无论侧柏还是柏木,都更适宜于黄棕壤类土壤,但在石灰土类土壤上造林,选择侧柏比选择柏木成活率 高,成林更早,后期生长更快。

Abstract:

In order to provide technical support for afforestation on difficult sites , the dominant factors and growth process of cypress ecological forest in Danjiangkou Reservoir Area were analyzed. The results showed that the dominant species of cypress ecological forest in Danjiangkou Reservoir Area were mainly cupressus funebris and platycladus orien- talis(60. 87% and 36. 25%) . The main factors affecting the mean height of platycladus orientalis stand were soil layer thickness , soil type and slope . The most suitable combination of dominant factors for the growth of platycladus orientalis is : The thickness of soil layer is more than 20cm, the soil type is yellow brown soil, the slope is less than 15degrees , and the thickness of soil layer is more than 20cm, the soil type is calcareous soil, the slope is less than 15degrees . Both platy- cladus orientalis and cupressus funebris are more suitable for yellow brown soil, but in calcareous soil, platycladus orien- talis is more suitable for afforestation than for cupressus funebris .