Path Analysis on Crown Morphology and Growth Shape of Manglietia yuyuanensis

In order to understand the influence of morphological characteristics of crowns on growth morphology of Manglietia yuyuanensis. Using multi-objective decision-making methods to evaluate the overall performance of growth morphology. Using the path analysis method to study the relationships among crown width, coronal rate and canopy rate of single-planted wood, the diameter of the breast, the height of the branch, the sharpness, the height of the chest, and the comprehensive score of the growth shape of the 32-year-old M. yuyuanensis plantation in Fujian. The results show that crown width, crown shape rate have significant and positive impacts on growth and stem-form characteristics including individual volume, DBH and height under branches, but crown rate has significant negative effects. Crown shape rate has significant and negative impacts on breast height form factor, but has no significant impacts on taperingness. Crown rate had significant and positive on taperingness, but had no significant impacts on breast height form factor. Crown width has significant positive impact on taperingness and significant negative impact on breast height form factor. The influence and the order of relative importance of canopy characteristics on those growth and stem form quality indicators of M. yuyuanensis are different. Crown width, crown shape rate have significant and positive impacts on the growth and stem-form comprehensive performance, but crown rate has significant negative and impacts on the growth and stem-form comprehensive performance, the order of relative importance of factors is crown width > crown rate > crown shape rate. The ideal crown shape for M. yuyuanensis is a larger crown width for the first time, followed by relatively small crown rate, long and narrow crown under the premise, the key points and directions of crown morphology regulation should be to promote crown width.